SBF FORD 289 302 347 KING ROD BEARINGS CR 804 SI-STD

KING ROD BEARINGS FOR SBF FORD 289 302 & 347 STROKER ENGINES FOR THE FOLLOWING YEARS:

FILE PHOTO. ACTUAL APPEARANCE MAY VARY.

Engine Bearing Kit Model or Series: SI-Series
Make: Ford
Engine: 302 SBF
Includes Rod Bearing: CR804SI
Rod Bearing Type: Replacement
Rod Bearing Construction: Bi-Metal
Chamfered/Narrowed Rod Bearing: No
Rod Bearing Coating: None
Rod Bearing Oversize: Standard
Includes Main Bearing: MB529SI
Main Bearing Type: Replacement
Main Bearing Construction: Bi-Metal
Main Bearing Oversize: Standard
Quantity: Sold As Kit

King bearings are outstanding in quality and unique in design. Here is where quality, design, and value all come together. This particular series is intended for use on most all style rods, and the main bearings are intended for use on all cast nodular, cast iron and cast steel crankshafts. 

When running 4340 forged crankshafts, this is NOT the style bearing recommended, as the HP series main bearings have a different design due to the built in radius on the journals of most 4340 crankshafts.

We also have a rod and main bearing combo available, as well as various sizes. See our other listings.

Tri-metal vs. Bi-metal Bearings

Traditional rod and main bearing construction is based upon a three layer configuration composed of a steel backing, a copper-lead layer and a very thin overlay of babbitt material only .0005″ – .0008″ thick.

King’s bearing uses just two layers, a high strength steel backing plus a bonded layer of “Alecular” bearing material .012″ – .015″ thick.

Alecular material is used exclusively by King. It is an alloy of aluminum, tin, copper and several other elements. Because it is an alloy, it maintains its properties throughout its entire depth, delivering consistent and reliable performance.

Benefit No.1 – Particle Embedability

More than half of engine bearing failures are caused by metallic particles which scratch crank journals and tear or weaken thin babbitt overlays such as in the tri-metal bearing.

Since King’s Alecular bearing layer is much thicker than the babbitt overlay (.015″ vs. .0008″), it provides eighteen (18) times more embedability than a tri-metal bearing to catch and hold particles so they don’t scratch the crank journals. This is especially true for particles over .0004″ in diameter which cause most of the damage.

Benefit No. 2 – Conformability

The much thicker layer of Alecular bearing material (.015″ vs. .0008″) allows the bearing to conform to problems such as metal to metal contact when there is mis-alignment present or the connecting rods stretch. Greater conformability means fewer bearing failures.

Benefit No. 3 – Temperature Resistance

The Alecular material’s melting/fatigue point is over 1100⁰ F, almost three times that of the thin babbitt overlay in a tri-metal bearing (400^OF). This means added protection against localized overheating due to mis-alignment, detonation, overloading, loss of coolant, etc.

Benefit No. 4 – High Load Capacity

Alecular bearings successfully withstand the stresses of blown, nitro-methane burning Top Fuel dragsters generating 5,000 hp at 8,000 rpm and in 700 hp circle track engines running for extended periods of time. The same metallurgical alloy is used in King’s street bearings that is used in King’s High Performance bearings, so the regular bearing user gets the advantage of the alloy developed and used in race engines.

Benefit No. 5 – Control of Wall Tolerance

Bearing-to-journal clearances on main and connecting rod bearings can be affected by several variables, all of which the engine builder must try to control. King has removed concerns about inconsistent shell to shell bearing wall thickness by the use of statistical control methods to keep wall thickness to very limited variation.

Other manufacturers produce bearings whose wall thickness at the crown can vary by up to + .00025″. King bearings are produced using “Bull’s Eye” specs which set a higher standard of controlling the wall thickness, permitting no more than + .00010″ variation of the desired thickness.

The benefits of tight control of wall thickness tolerance are:

• Improved consistency of bearing to journal clearance. No more trying different bearings within a set to get the “right” fit.
• Superior eccentricity and crush relief values for a better oil “wedge” and less journal wear.
• Less taper across the bearing face, meaning superior wall stability, a more parallel wall and better oil film development.
• Crankshaft grinder does not need to grind cranks “fat” or “thin” to compensate for bearing variations.

Benefit No. 6 – Crankshaft Endplay

All bearing companies solve crankshaft journal wear by supplying oversized bearings. However, King went two steps further with the development of Max Flange and Pro Flange. Max Flange reduces endplay by supplying the flange on the high side of the tolerance to compensate for crankshaft thrust surface wear; this process is used on all King bearings. Pro Flange are bearing sets supplied with oversized flanges allowing the thrust surface to be ground to .010″, .020″, or .030″ undersize. 

Very Important Note! Our sales staff has limited technical knowledge on this product and are usually unable to answer many of the questions asked. Many of the questions asked are if we have bearings for applications other than the ones listed. We do not have any other bearings available other than what our listings show. For technical info on this product, refer to the bearing manufacturer’s web page.   We are not responsible for collateral damage caused by the use of this product.   RETURN POLICY Should a problem occur, please contact us. If a return is necessary, please contact us for an RGA number and return authorization. The RGA number must be included on the return label. If an item is returned without an RGA number, it will not be processed. A full description of what the problem is needs to be included with any returned product with your contact info, and proof of purchase. Even though you may have explained the problem to us, and been granted permission to return the product, we must have a written explanation and a contact number included with the product. It is also recommended that you include the name of the person from our company that you have been in contact with. You must send the item back to us in a trackable manner (USPS Priority Mail, FedEx, etc.) and keep the tracking info of the returned product. Please give ample time for returns to be processed. Following these guidelines will make the return process work as it should.   PAYMENT AND SHIPPING DETAILS.   We offer great discounts on shipping. You only pay the full shipping fee on the highest shipping cost of your items, and HALF PRICE shipping on all additional items. Few offer discounts on shipping such as this. Our checkout system will automatically calculate your shipping discount at the time of final payment, providing you consolidate your payment. You may receive a verification and tracking number shortly after purchase, but this does not necessarily mean that your product has shipped. It would be fair to say that 98% of products will be going out the day the shipping label is issued. On occasion, the product may not ship out until the next day after the label has been issued. Most products purchased late in the day will not be shipped until the next day.     If you checkout and start over, the auto calculator will not recognize the multiple purchases, and there will be no shipping discount.