The AFR Enforcer Ford heads listed online have an incorrect combustion chamber size showing them to have 59cc chambers. The actual combustion chamber size is 64cc. The runner size also shows them to be 185cc. The correct runner size is 190cc. We have verified this at our shop.

See our many listings for the AFR Enforcer heads. We offer these heads set up for use with a hyd. roller cam. Be sure of what cam type you have when selecting the heads you need for your application.

Important note:

These heads will include a full set of genuine ARP rocker studs. We have 3/8" or 7/16".

Adjustable AFR guide plates and head bolt spacers "hats" included for use on 351W engines.

The Best Flowing, Best Quality SBF Aluminum Heads on the Market for the Money

This sale is for one fully assembled set of heads.

The springs in these heads are set up to operate with hydraulic flat tappet cams up to .535 lift. For those running hydraulic roller cams, see our other listings for these heads with the part number AFR-FORD-274.

The AFR Enforcer FORD aluminum heads have 64cc combustion chambers with 190cc runners, 2.02/1.60 stainless valves. These heads are not built by Procomp and have no association with them in any way.

Spark plugs are in the standard Ford location.

We certainly know where to draw the line with low-end products, and we continue to eliminate parts that we once accepted but that eventually had problems. Sometimes it's not that a particular product has had a problem that leads to its elimination; something better just comes along. The AFR Enforcer/NKB cylinder heads are that "something better" coming along. Considering the price is only slightly higher than our former line of heads, this has to be the best value in a set of cylinder heads we have ever offered.

Our cylinder heads are made from AC4B alloy and tempered to T6 standards (see table below).

Flow numbers for AFR Ford 190cc Heads

All tests were performed on a Superflo 1020 bench by our expert head builder. We stand behind the accuracy. We have noticed many other sellers posting what we consider to be false flow numbers on the heads they are selling. We find this to be nothing short of outright fraud. Of course, flow numbers can vary a few points depending on equipment used and testing methods, but not by 15-25 points. Notice the low lift flow numbers produced by our new heads. That is as important as the upper lift numbers, and it's why these heads produce so much peak power and torque. We are very impressed with the flow numbers of our new heads.

👉 One Year Warranty - Unlimited Mileage Warranty!

Hardware

They come fully assembled with the identical components found in our higher-end CNC ported cylinder heads; such as ARP rocker studs, PAC Racing springs, Viton valve seals, AFR adjustable guide plates, machined bead valve locks (not stamped), hardened spring cups, and our one-piece 8mm 21-4N Stainless Steel valves. They are available bare without any parts for the DIY.

Rocker Arm Studs

If you have been a regular shopper with us, you will have noticed we do offer some knock-off products that are made offshore. We also sell many products made in the USA. We have always been very particular about the quality and workmanship of such products, while considering the cost. We scrutinize our products very carefully and refuse to sell products that simply don't meet our standards. We have now eliminated another of the low-cost knock-off products from our line. The low-cost imported rocker arm studs have shown numerous problems unlike those in the past. We have looked at several others on the market and still find many issues with them that are not acceptable.

Many of the studs had run-out in the shaft of up to an eighth of an inch. This caused major problems with rocker alignment, and depending on where the position was when the stud tightened up, it would determine the direction of the rocker misalignment. If the warped stud was facing toward or opposite the valve, then the roller tip would not be centered on the valve tip. This would then create a loss of lift and cause increased wear on the valve tip.

If the warped stud tightened up in a side-to-side position, then this would allow the rocker tip to be cocked on the valve tip. This would then side-load the valve tip with undue pressure, creating a serious wear problem on the side of the valve tip and creating excessive wear on the valve guides in the heads. This also side-loaded the rocker trunnion and front roller, creating an excessive wear issue in the roller rockers.

We also found a difference in the tread pitch and depth compared to the ARP studs. The rocker studs in an engine are under a tremendous upward pull, and improper thread design may cause the studs to pull out of the head. The ARP studs screw into the heads with a very precise fit and feel.

After thoroughly comparing the ARP studs and several offshore models, I am convinced that we will never offer the offshore studs again, regardless of the price difference. They were never as bad in the past as what we're seeing now. This run-out was most likely caused by improper heat-treating methods.

We have rejected many products that are outright junk and would cause serious issues in your engine, only to see other sellers offering those same exact products. It's all about learning where to draw the line.

Studs and guide plates are included. See our other listings for a full selection of accessories.

See our other listings for valve train-related items that you may need for your project.

We are glad to offer many great low-cost items, as well as the high-end products, but will always give careful consideration to quality, functionality, and overall value.

What's it made of?

The AFR cylinder heads are made from AC4B alloy and tempered to T6 standards. You may have heard the alloys 355 and 356 being used on many heads. The alloy used on our heads is similar but slightly different. The AC4B alloy is commonly used by automakers in Europe and Japan. Take notice of the Rm value. This value indicates the tensile strength of an alloy. As you can see, it's higher than all the other common alloys in this chart. It's no surprise as to why we have never experienced a failure of any kind with these heads. Zero failures in the casting, zero failures in the seats and guides. We have sold over 5000 pairs of these heads over the past four years.

List of Standard Alloy Characteristics

Product Information