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BBC CHEVY 572 COMPLETE ENGINE HYDRAULIC ROLLER CAM
760 HP @ 5800 RPM.
740 lb./ft torque @ 4900 rpm.
RUNS ON PUMP GAS.
This engine is fully assembled from intake to oil pan.
DART BIG M SPORTSMAN BLOCK WITH SPLAYED MAIN CAPS.
WISECO PISTONS, SCAT CRANK, AND SCAT RODS. BRAVO 335cc ALUMINUM HEADS.
4.560" BORE X 4.375" STROKE
- DART BIG M SPORTSMAN BLOCK WITH SPLAYED MAIN CAPS. COMMONLY USED IN ENGINES BUILT TO 800+ HORSE POWER.
- BRAVO 335cc ALUMINUM ALLOY HEADS.
- COMP HYD. ROLLER CAM AND HOWARDS MAX EFFORT TIE BAR STREET STRIP ROLLER LIFTERS.
- CLOYES RACE BILLET TIMING SET. THE VERY BEST CLOYES HAS TO OFFER.
- SCORPION ENDURANCE SERIES HIGH PERFORMANCE ALUMINUM ROCKERS 1.7 RATIO.
- SCAT 4340 FORGED CRANKSHAFT, CLEVITE BEARINGS. BALANCED ON OUR CWT BALANCER TO BELOW 2 GRAMS.
- SCAT H-BEAM RODS WITH ARP 8740 CAP SCREWS.
- WISECO PREMIUM FORGED PISTONS. 800+HP RATED.
- MELLING M-SELECT SERIES OIL PUMP WITH M-SELECT DRIVE ROD.
- CHAMP CUSTOM 8 QT. OIL PAN WITH OIL CONTROL SYSTEM.
- PRO-RACE BRAND SFI DAMPER.
- TWO YEAR WARRANTY.
Pump gas friendly.
Our 572 Hydraulic Roller cam engine will produce 760 horse power at approx. 5800 rpm. The build sheet is at the lower part of this listing. This engine is an excellent choice for use in classic street rods, sport trucks, 4x4 trucks, and can be used as a daily driver. High mileage use is not a problem with this engine. This is engine may also be setup for use in larger work trucks, or motor homes. We can also set any of our engines up for marine use.
This engine will produce more than triple the horse power of the original bbc 396, 427 and 454's and an enormous amount of torque. Pump gas friendly. For those wanting to put this engine in a classic car or sport truck, select cam choice # 1 or # 2 with the Hurricane intake. This engine will deliver very impressive power in the lower rpm range, and have a very high degree of drivability and long life.
See our other listings for the fully dressed out turn-key version.
Two year warranty, see details below.
This engine is designed to have a high level of drivability, or street manners. Cams #3 and #4 are our favorites for offering exceptional low end and mid range performance plus max drivability without needing to deepen final gearing or the need for a high stall speed torque converter.
If you choose to go with the Hurricane single plane intake and the first choice cam, it will bring the hp numbers up to 760 We do not recommend the single plane intake combined with cam choice 1 on any car that is over approx 3,200 lbs and/or cars with a steep (tall) final gear.
Please read the cam info provided below on the four cam choices before purchasing this engine. It is very important that you choose the correct cam and intake for your car and its intended purpose.
Here are a few good reasons why we think the 572 engine is a better choice than the stock GM bbc engine.
1. The 572 will accelerate any heavy car much better than any of the smaller cubic inch bbc engines.
2. The exhaust note from this big block engine is much deeper than that of any of the smaller cubic inch bbc engines.
3. Installing this engine in heavy cars or trucks without killing acceleration, or having to deepen the final gear, and needing a huge stall converter is a real plus. This engine will accelerate a 7500 lb vehicle much better than any stock bbc engine.
4. Low maintenance and high drivability even in very heavy cars and trucks, while generating up to 760 hp for nearly the same cost to build one or two steps down.
5. Longevity and reliability. You don't have to turn the engine to a critical rpm range to produce its max hp output. There's nothing unsafe about running an engine that's well built like this up to 5800 rpm. The hydraulic roller cam is very reliable and will not require a bronze distributor gear, as it has a normal cast gear.
6. Should you ever decide to sell your car or truck with this engine, the resale value would be greatly increased.
We do a full test run on every engine we build on a test mule. The engine is run for two intervals of 15 minutes each, and every possible issue is addressed. When you install the engine, you must verify that the timing is set at the correct value, and the fuel to air ratio must be verified. We also include an engine stand like the one pictured, wheels included, and an engine lift plate.
As of 10/25/2016, we completed installation of our second brand new Super Flow 902S dyno. This dyno is dedicated for dyno testing and tuning on our bbc engine line only.
De-tuned engines with different cam and intake combos will move the torque into the low rpm range, and is very desirable if you’re sporting around on the street, rather than all-out racing. The de-tuned version of this engine will also allow you to set the car up closer to stock and increase drivability to a very high degree. Throttle response is also noticeably better. We can help you with a cam and intake selection that best suits your needs.
The build sheet is as follows:
Pictured below is the new Dart Big M Sportsman block. This block is the absolute ultimate in quality, durability, and value.
Dart Block Specs. and features.
- Standard 9.800" deck ht.
- Siamesed extra thick cylinder walls to resist cracking and improve ring seal (minimum .300" thick with 4.625" bore).
- Uses +.300" tall Gen VI style lifters.
- Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures.
- 4 bolt ductile iron main caps have splayed outer bolts for extra strength.
- True priority main oil system lubricates the main bearings before the lifters.
- Oil filter pad is drilled and tapped for an external oil pump.
- Lifter valley head stud bosses prevent blown head gaskets.
- Rear main cap uses standard oil pump and two piece seal - no adapter required!
- Mechanical fuel pump boss, clutch linkage mounts, and side and front motor mounts simplify installation in any chassis.
- Dual oil pan bolt patterns fit standard and notched oil pans.
The block is bored to size with our new Centroid touch probe machine. Few machine shops have a machine of this accuracy.
We also deck the blocks to an RA finish of approx. 15 or better. The decking procedure is also done by our Centroid CNC machine.
We often find many brand new blocks to have a sloping deck of up to 4 thous. When we're finished decking the block, it is within approx. .001 accuracy from end to end. Many machine shops fail to catch this as the machinery they use does not allow for such accuracy.
We then plate hone the block with our new Sunnen SV10 diamond hone machine. This is also a very advanced machine that hones the block with a finish unlike conventional machines.
The final step is to clean the block in our high pressure block washer.
Pictured below is the rotating assembly that comes in this engine.
(file photo, actual parts may vary, see details below)
The photos above and below are file photos. Actual appearance may vary. This picture is to give you an idea of parts used in the rotating assembly portion of this engine. All parts are brand new, first line, unblemished, and balanced in house.
READ THIS LISTING COMPLETELY BEFORE YOU BUY ELSEWHERE!
Connecting Rod Specs.
Piston & Ring Specs.
Bearing, Damper, and Flexplate Specs.
Listed below is a complete breakdown of all the parts that are included in this engine.
WISECO FULLY FORGED PISTONS, RATED AT 800+ HP. WISECO PISTONS ARE 100% MANUFACTURED IN THE USA. THEY ARE ONE OF THE HIGHEST RATED PISTON BUILDERS IN THE COUNTRY.
The Wiseco fully forged pistons are rated very high in the street/strip performance industry. They offer several price levels of pistons, starting with the Pro-Tru Street version made with 4032 forged alloy. The next level up would be the Professional series that are much more expensive and made from 2618 aircraft alloy.
Our custom made Wiseco pistons are very close in comparison to the Professional series as they are made using the 2618 aircraft alloy and have fully machined crowns.
We have seen a few engine builders use the non-forged hypereutectic pistons, and we find them to be very risky for any carbureted street rod engine. We would not even consider using such pistons. If the pistons are non-forged or forged 4032 alloy, they may fragment from the effects of detonation. This can then allow the connecting rod to destroy the block, crank, and cylinder head. Those types of pistons are fine for stock or very mild engine builds, but should never be used in carbureted engines built to high horse power levels. These type of pistons, especially the hypereutectic version, will not stand much detonation. The forged 2618 alloy piston is so much more resistant to the effects of detonation, and heat.
Our Wiseco Forged pistons are custom designed with an increase in compression height. This has many advantages. Here are a few facts about compression height and deck height.
Our custom made Wiseco pistons have a compression height that is .010 taller than nearly all catalog pistons on the market. We find this to be a very valuable feature.
Since our pistons sit at a taller than normal compression height, we only have to remove approx. .005-.010 off the deck surface of the new Dart block to achieve a zero deck. This also allows for future deck re-surfacing and still not ending too far below stock deck height. On our bbc engines we actually leave the piston about .003 in the hole to allow for possible piston rock.
Since nearly all bbc catalog pistons on the market sit .020 below the surface of a virgin block, the only way to achieve a zero deck or close to it would be to cut approx. .020 off the deck surface. This compromises the integrity of the block, in our opinion.
Another good feature of our taller compression height is that the ring land above the top ring is much stronger by being .010 thicker. When pistons encounter the effects of detonation, it is not uncommon to see pistons with the ring land above the top ring broken off. The thicker ring land also makes a better heat sink.
You may have noticed that our Wiseco custom made forged pistons are referred to as Racing Pistons on the package. This does not mean that the pistons are for racing only. This is a generic term, referring to their ability to be used in high performance applications as well as for street rod use. These pistons are perfectly designed for use on the street, as well as for medium to upper level drag racing.
Our custom made Wiseco forged pistons are made from 2618 aircraft alloy. We find this alloy to be much more suitable for high performance engines than the common 4032 forged alloy. You will usually see the higher end pistons on the market using 2618 aircraft alloy.
Why go with 2618 forged pistons? If you encounter certain tuning issues, detonation is highly probable, and its effects can cause severe damage to your engine. The 2618 forged piston is able to withstand the damaging effects from detonation to a higher degree than the lower cost 4032 forged pistons, especially non-forged hypereutectic pistons such as Speed Pro or Keith Black, and many others.
We have built approximately 3500 engines using the Wiseco pistons. The engines have been for street rod and strip use. We have seen no problems, nor has there been any complaints. They are an excellent product in every respect.
The pictures below are file photos of our Wiseco pistons.
MAHLE HIGH PERFORMANCE MOLY RINGS
Scat 4340 Forged Crankshaft
The picture below is a generic file photo of a Scat crankshaft.
Some of the benefits of the Scat crankshaft:
The material used in this crankshaft is manufactured from an exclusive Space Age material that was designed for high strength and fatigue resistance. The Scat cranks are the best value you will ever find. The Scat crankshafts are the best way to build a strong bottom end for, street rods, dirt and circle track racing, and drag strip racing.
Pictured below is our ABS crank polishing machine in action. We polish the crank on every engine we build. This extends bearing life, keeps oil cooler, and with the reduced friction, a slight increase in horsepower is gained. Many machine shops fail to do this. The finish on most cranks are at the bare minimum of acceptance, and we know this can affect bearing life. We have measured the RA finish with our profilometer, and found it to be as high as 25 RA finish on many of the cranks. We bring that number down to below 10.
We now use the Clevite bearings in our engines.
Our choice of rods are the Genuine Scat brand heavy duty 6.385 H-beam rods with ARP cap screws.
We use genuine Scat rods with ARP cap screws in all of our engines. Our Scat rods are bronze bushed, and unlike Eagle I beam rods, these are fully forged 4340 alloy.
We have noticed some engine builders using low cost generic rods and crankshafts in their engines. These non-branded, (no-name) products are often poor quality in many ways. You will notice many of the low end engine builders fail to mention the actual brand of the rods or cranks used in their engines. Upon further investigation you will find such parts not to be a branded name product. They may label these parts with a name, but one that is totally unrecognizable in the industry. Our experience in years past with such rods and cranks has been disappointing to say the least. Besides the obvious issues such as incorrect sizing and machining that is difficult to correct, the questionable alloy these items may be produced from and the potentially incorrect heat treating methods used, could prove to be disastrous. Little can be done to verify this and nothing can be done to correct it. Failures of such critical parts will usually result in catastrophic damage to the engine. As you may have noticed, this is why we specify the brand name and series of every part used in our engines.
Many of the inferior "no-name" rods on the market will also have "no-name" rod bolts in them. We have seen these bolts before, and they are very low quality. They don't have ARP's rolled thread design, and they don't torque down with the same characteristics as a genuine ARP bolt. It's not just a matter of having a different brand bolt in the rods; these bolts are low quality in many ways. They have been known to fail in engines to a much greater degree than a high quality rod bolt, and this failure usually causes catastrophic damage in the engine. Beware of rods that don't mention the rod bolt brand. As far as we're concerned, ARP bolts are the only brand we would ever use or accept in a set of rods.
Genuine ARP 8740 cap screws.
PRO RACE BRAND SFI HARMONIC DAMPER, 7.0 DIAMETER INCLUDED.
Pro-Race brand dampers are used on all of our engines.
INTERNALLY BALANCED, 7.0" DIAMETER REDUCED ROTATIONAL MASS, OFFERS EXCELLENT CLEARANCE.
1.52" THICKNESS, 2.38" THICKNESS WITH HUB
BILLET ALUMINUM TIMING POINTER. VERY FEW SELLERS FINISH OFF THEIR TURN KEY ENGINES AS WE DO.
We did not offer this billet timing pointer in the past. However, we noticed that there was a birds eye view of the timing pointer from the driver side of the engine, so we decided to use these on all of our engines.
As you can see in the picture below, these timing pointers have a glove like fit.
HEAVY DUTY SFI RATED FLEXPLATE MADE IN THE USA INCLUDED.
This SFI flexplate is made in the USA and will resist cracking and warpage to a very high degree. One good telltale in identifying a low quality flexplate is the lack of welding on each side where the plate mates to the ring gear. They usually have a pale grey color to them, as they are not coated, and will rust quickly. Ours are welded on both sides, and are much thicker than an OE plate, and are zinc dichromate coated.
We do offer this engine with a manual flywheel. In most cases we do have both sizes, 153 and 168 tooth, available.
Our CWT 5500 Balancer.
We do our own balancing with our new state of the art CWT 5500 Series balancers. The CWT 5500 is the ultimate for precision balancing. We now have three of these in our machine shop. We consider this machine to be highly advanced compared to the Hines balancer we once used. We balance every rotating assembly we sell within 2 grams or less at no extra charge. A balance sheet is included with your engine.
Three new CWT balance machines under one roof is a rare sight.
Our crew wrapping up for the day. Pardon the mess.
Bravo aluminum cylinder heads. 335cc runner size.
Fel Pro 1057 premium race grade series head gaskets, ARP head bolts, and rocker studs.
ARP HEAD BOLTS AND WASHERS.
We are offering two cam choices listed below in this engine. Read the specs carefully.
Cam Choice # 1 By Comp Cams.
Part number: 01-461-8
112 lobe sep.
Cam choice # 1 offers great drivability and excellent mid range power. Valve train stability and longevity is very good with this cam. Max power will be achieved at approx. 5800 rpm. You may use the single plane intake with this cam and not affect the low end power to any noticeable amount.
Cam choice # 1 will allow you to run a stall converter in the 2250-2500 rpm range. Final gearing when used in a car or sport truck could actually be in the 3.30 range or even taller, and overdrive use may be possible. Mileage with taller gearing is also a plus. This cam would be most suitable in heavy vehicles weighing up to 5000 lbs. This cam may develop enough vacuum to operate power brakes.
Below are our dyno results on our 572 engines with cam choice # 1. Your results may vary depending on intake choice. The horse power numbers will always improve anywhere from 5-10 more than what the dyno results show after the rings have fully seated.
Official Dyno Results on this cam in our 572 pump gas engine with a single plane intake and new Bravo 335 rectangular port heads. Compression ratio was 10.2:1 Cam used was our Comp 575/575 lift hyd. roller.
Cam Choice # 2 By Comp Cams.
Part number: 01-456-8
112 lobe sep.
Cam choice # 2 offers a decent amount of bottom end torque compared to cam choice # 1. This cam selection is the best choice for cars that have very medium to tall gearing. This cam will allow the engine to operate well in the 1900-2000 rpm range. Very good acceleration with improved street manners. The peak horse power falls about 15-20 under cam choice # 1. This cam would also be excellent for medium to heavy vehicles. Max power is achieved at approx. 5700 or less. This cam has been very popular for those more concerned about drivability and outright longevity of the valve train and engine engine. The valve train wear with this cam would be very low. Off idle power is decent. We see no drawbacks to going with this cam. The power in the low rpm range is amazing. Vacuum should be enough for operating power brakes.
Cam Choice # 3 By Comp Cams.
Part number: 01-424-8
110 lobe sep.
Cam choice # 3 offers a huge amount of bottom end torque. This cam selection is the best choice for cars that have very tall gearing or overdrive transmissions. This cam will allow the engine to operate well in the 1800 rpm range. Very good acceleration with excellent street manners. The peak horse power falls an additional amount of about 15-20 under cam choice # 2. This cam would also be excellent for heavy vehicles, quad cab 4x4 pickups. Max power is achieved at approx. 5500 or less. This cam has been very popular for those more concerned about drivability and outright longevity of the valve train and engine engine. The valve train wear with this cam would be virtually non-existent. Off idle power is very good. We see no drawbacks to going with this cam. The power in the low rpm range is amazing. Vacuum should be enough for operating power brakes. Long range cruising and operating air conditioning is not an issue with this cam.
HOWARDS MAX EFFORT LIFTERS & HOWARDS CHROMOLY PUSHRODS.
We use Howards brand premium pushrods in all of our engines. They are lightweight in design, yet very strong. Made in the USA from 4130 chromoly steel. Regular hardened pushrods will most likely flex in the engine when running above normal RPM ranges, and risk bending under high RPM. These do not have the welded ball on the end. We only use the swedged one pc. design, which is a well proven design far superior to the style many others use in engines. 4130 chromoly steel is also much stronger, and will resist flexing. When a pushrod flexes in the engine, you lose lift. Don't be misled by the term "hardened," as this is nothing more than a stock style low cost push rod. They will flex in the engine or possibly bend permanently.
Our choice of lifters are the Howards brand Max Effort tie bar lifters. These lifters are much costlier than the regular tie bar roller lifters, and have many unique features.
Pictured below is our Speedmaster single plane intake. We also offer the Edelbrock line of single and dual plane intakes as an upgrade.
We have several different options in valve covers. Here are our most popular choices:
We also offer this engine in a higher compression version with a solid roller cam option. See our other listings for the full line of our engines.
304 STAINLESS ALLEN HEAD INTAKE BOLTS ARE USED ON ALL OUR ENGINES.
Timing components: Cloyes Race Billet double roller timing set. Part # 9-3645X3
Polished Aluminum Timing Cover.
We use the top of the line Cloyes timing set. The difference in quality is dramatic compared to the common true double roller setup. The chain is made in Germany, and the sprockets are hardened billet steel (upper and lower) and made in the USA. These sets are hand matched for selective sizing.
The cost on this high end timing set is approx $141, about four times the cost of the low level budget timing set used by many other engine builders. Should you ever want to confirm that this is what is actually in your engine, you can remove the timing cover, and you will notice the upper gear has a full array of lightening holes.
This top of the line timing set is offered in three different chain tension setups, allowing us to set it up perfectly every time. One more benefit is that timing accuracy is very precise and will remain that way. This timing set will likely last for the life of the engine. This is what you will find in most solid roller engines, as they have very high spring rates, and create an enormous load on the chain and gears, compared to non solid roller setups. It may seem like a bit of overkill to use such a high end timing set, but the versatility and extreme quality outweigh the cost, in our opinion.
SCORPION RACING ALUMINUM ROLLER ROCKERS.
THE BEST HIGH PERFORMANCE RACING ROCKER ARMS MANUFACTURED IN THE USA.
All Scorpion Rockers Feature:
Needle Bearing Fulcrum and Roller Tip, Centerless Ground Trunnion, Centerless Ground Pin & Roller, Burr-Free Thru Hole in Trunnion, Large Machined Seat, Thick Walled Adjusting Nut, Pedestals Machined from Solid Steel, Black Oxide Coated Steel Parts, & 100% CNC Machined.
If you’ve read our warning on engine builders using low grade no-name rods and cranks, a very similar situation exists in the roller rocker market. We do not use or sell off-shore, (no-name) roller rockers, period. They have proven to be faulty in many ways. The center trunnions are not polished, nor is the center of the roller tip true to size or polished. Metal fragments are often left inside the trunnion housing and will cause destruction of the needle bearings. The aluminum alloys used are never aircraft aluminum alloys as are used in all USA made roller rockers. They often mention the alloy as being 6061, and that is a very soft form of aluminum. The 6061 alloy used on these will assure rocker-flex on any higher than stock spring pressures, and this will affect performance. The pins and keepers that hold the parts together are often of poor quality and improperly installed. The front roller will usually scoot along the valve tip, as it can't roll properly due to rough internal surfaces.
We have honestly seen valve tips that were scalloped out due to the front roller dragging across them. This will cause the valves to side-load against the valve guides in the heads and surely cause damage to them if run like this for very long.
We have scrutinized these products in the past and found all of the above problems, and I can tell you there are most likely many more. We would not use them in an engine under any circumstances. You will also see many of these rockers made from stainless on the market. They use a very low grade stainless that actually has a near non-existent amount of nickel in them, but that's not the real problem with them, as stainless steel has no advantage over high grade heat treated steel when it comes to a roller rocker. The lack of hardness of the rocker body is the real problem. The problems with these stainless rockers are the same as mentioned above. These are the roller rockers you see on the market for around $119 and up to $169 for the so called stainless ones. They are pure junk, in our honest opinion. They could possibly be used on a budget back yard stock build up that has a very low spring pressure, with a cam that has very low lift, but then you would be better off with the stock stamped rockers on such a build.
We have heard of many engines using these rockers that came apart and spilled needle bearings into the engine, only to end up in the oil pump. It seems like some engine builders do not care how long the parts in your engine last, or they simply don't know this. I can tell you for sure that using such low grade, "no-name" roller rockers is asking for trouble.
We use Scorpion, Comp Ultra Pro Magnum, and Comp Gold Arc rockers in all of our engines. The difference in these compared to the low grade no-name rockers on the market is huge. Do a Google search on this subject and you will know then what we’re talking about.
Champ premium oil pan.
The oil pans we use on all of our engines are made in the USA by Champ. The Champ oil pan has a full windage tray, crank scraper, and trap door. Threaded dipstick is included. Extreme duty pickup designed not to fail. The oil pan is made from a thicker than normal gauge material, and has embossed ribs in the body.
This is an extended capacity oil pan. The special pickup tube is designed for this oil pan. If you think you may have a clearance issue with the 8 qt pan, let us know and we can use the stock style pan.
The 8 qt pan is approx half an inch deeper than a stock pan, and the kickouts on the side are at the lower section of the sump. They start to swell outward about three inches from the bottom, approx. 3 inches or less on each side. Most vehicles have no problem with this type of pan and it's certainly a much better setup than a conventional oil pan.
The quality of these pans far exceed any of the lower priced oil pans used on many engines.
Our choice of oil pan fasteners is our premium studded mini nut set. The nuts in this kit have serrated faces and built in washers. This is the ultimate set for securing the oil pan to the engine, and is far superior to the typical bolts used by others. We use this same kit on our very high end engines.
Genuine Fel Pro Oil Pan Gaskets are used on all of our engines.
Melling M-Select Oil Pump, and M-Select Drive rod with ARP stud.
The M-Select series oil pump by Melling has several important upgrades compared to the regular Melling M-55 Series. The gears are billet steel, and the body is stronger, coated with corrosion-resistant nitrite. This oil pump also includes the M-Select drive rod. Both components are far superior to the regular Melling oil pump and drive rods used by most other engine builders.
We use this premium studded mini nut set for oil pan and valve cover fasteners. The nuts have a serrated face and built in washers. This is the ultimate set for securing the oil pan to the engine and is far superior to the typical bolts used by most other builders. We use this set on all our engines.
We include an engine lift plate and heavy duty engine stand with casters with every engine we build.
Our new 572 engine is premium pump gas friendly, with very good street manners. NEVER run regular 87 octane in this engine, premium only unless you have opted for our de-tuned version with a reduced compression ratio. Should you ever hear any sign of pinging or clatter in the engine when accelerating, reduce timing one or two degrees.
IMPORTANT NOTE ABOUT DE-TUNING.
For those with very heavy vehicles, such as 4x4 quad cab trucks, 3/4 ton trucks, and crew cab/ex-cab trucks, Suburbans, plus trucks that may do light to medium trailer towing, we strongly recommend the de-tuned version of this engine.
Our machinists have many years of experience in building racing engines. This very critical work is done to exacting specs and with great care. Many vendors do not have machinists with the experience or the proper equipment that we are fortunate to have. We have built engines that cost upwards of $50,000. All of our engine builders have been in the engine machining and engine building line of work for their entire working lives. Their ages range from 38 to 65. We have a total of seven machinists/engine builders.
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