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The AFR Enforcer Ford heads listed on line have an incorrect combustion chamber size showing them to have 59cc chambers. The actual comb. 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.
*** IMPORTANT NOTE ***
You may add items into your shopping cart but in order to check out you will have to call us. Our check out feature on our website is being upgraded at this time. We can take your order over the phone and answer any technical questions you may have. We accept all major credit cards, cash, check, and money orders. Just give us a call at 423-722-5152 and we can process your order promptly. In the event you attempt to reach us outside of our operating hours, please leave us a detailed message and we will return your call at our earliest opportunity.
See our many listings for the AFR Enforcer heads. We offer these heads setup for use with a hyd. roller cam or hyd. flat tappet 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. The other sellers of the Enforcer heads only offer these with the 3/8's size rocker studs. We will allow you to chose the stud size, 3/8's or 7/16's. So be sure to let us know what stud size you would like. 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 roller cams up to .600 lift. For those running flat tappet cams, see our other listings for these heads with the part number AFR-FORD-272.
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 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. Details about this alloy are in the lower section of this ad.
A breakdown of the part number.
274 designates the use of longer valves, and dual springs with a damper setup for hyd. roller cams. You will also see the heads listed with the number 274. The 272 designates the use of standard length valves with single springs with a damper, setup for hyd. flat tappet cams. Feel free to call us if you need assistance deciding what you need for your build.
Below is our flowchart on these 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.
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AFR Ford 190cc
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Lift
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Int.
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Exh.
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100
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65
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59
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200
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113
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100
|
|
300
|
164
|
140
|
|
400
|
214
|
160
|
|
500
|
245
|
168
|
|
550
|
254
|
169
|
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600
|
259
|
170
|
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650
|
261
|
169
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See our other listings for these heads with our Competition Series PBM valves.
Our NKB Ford heads have been designed especially for us. After receiving many recommendations from our engine builders, we came up with the best quality, best flowing heads on the market relative to cost. The only way you're going to get a set of heads that flow as well or better will be to spend at least double the cost or more. These heads are excellent in design and quality.
ONE YEAR WARRANTY, UNLIMITED MILEAGE.
Here is a rundown on the hardware used in these heads and the assembly process.
They come fully assembled with the identical components found in our higher end CNC ported cylinder heads; such as ARP rockers 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.
IMPORTANT NOTE CONCERNING 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 off-shore. We do also sell many products made in the USA. We have always been very particular as to 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 where the position was when the stud tightened up, would determine the direction of the rocker misalignment. If the warped stud was facing toward or opposite the valve, then the roller tip would would not be centered to 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 create 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 upwards 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 off shore models, I am convinced that we will never offer the off shore 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.
IMPORTANT NOTE, MUST READ!
Our 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 pair of these heads over the past four years.
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List of Standard Alloy Characteristics
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Alloy +B4: H16
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AC4B
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AC4C
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AC4CH
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AC4D
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AC7A
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Mechanical
properties
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Rm
(MPa)
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345
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285
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260
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320
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245
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R0.2
(MPa)
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250
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225
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157
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240
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105
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A
(%)
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1.6
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7.3
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16.8
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4.1
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5.3
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Temper
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T6
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T6
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T6
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T6
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F
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Features
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High strength, small elongation
Castability: good,
for general purposes
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Castability: good
Pressure resistance, corrosion resistance: good
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Castability: good
Mechanical properties: good
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Castability: good
Pressure resistance: good
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Corrosion resistance: excellent,
anode oxidized
Castability:
not good
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Examples of
applied parts
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Crank cases,
cylinder heads,
and manifolds
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Hydraulic parts,
transmission cases,
aircraft parts,
lighting components, etc.
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Wheels,
engine parts,
hydraulic parts,
aircraft parts, etc.
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Cylinder heads,
crank cases,
fuel pump bodies, etc.
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Parts for overhead contact lines,
parts for ships,
business machines,
and lighting components for aircraft
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AFR Enfocer-190cc RUNNER SIZE 64cc COMBUSTION CHAMBERS FOR FORD ENGINES
Intake Valve Dia: 2.02"
Intake Port volume: 190cc
Intake Port Dim: 2.0" x 1.12"
Int Port Location: Stock
Intake Gasket: Felpro# 1262
Head Gasket: Felpro# 10112
Exh Valve Dia.: 1.600"
Exh Port volume: 70cc
Exhaust Port Dim:
Exh Port Location: Stock location & bolt pattern
Exhaust Gasket: Depends on what type exhaust you're using. Best to try and match up the gasket to your header or manifold
Flow, Intake: See chart above.
Flow, Exhaust: See chart above.
Head Bolts: ARP 154-3601
Rocker Studs: ARP 100-7101 (for 7/16" Rocker Arms)
Manifold: Most any. Our line of intakes fit very well on the NKB heads.
Milling: Min. Down to 58.5cc or 64.5 = .060" See info in this listing for details on this.
Pistons: Most aftermarket pistons.
Push Rod length:
Push rod Guide Plate: Comp Cams 4835-8 (for 5/16" Diameter Pushrods)
Retainers/Locks: Chromoly Steel Retainers, with 10° Comp brand machined locks are used on all of our heads.
Spark Plug: Autolite #3923 14mm x 3/4" reach
Spring Pockets: 1.550" OD (.030" deeper max)
Springs: PACALOY 1.290 large size outer diameter with internal damper.
Valve Length: 5.015" (+.200") for hydraulic roller cams.
Valve Stem Dia: 8mm - METRIC
Valve Train: STD SBF 3/8" or 7/16" stud mount
Valve Guides: 1/2" OD Int = Mag-bronze Exh = Phos-bronze (.002" press)
Valve Guide length: 1.950"
Valve Guide clearance: .0014" - .002" (with our .3415 dia. valve stem)
Valve Guide Spacing: 1.890" moved .030" from stock
Valve Seats: Hardened Ductile Iron, .006" press
Valve Seat dim. Standard
Valve Seat angles: Int = 32° - 45° - 60° - 70° Exh = 37° - 45° - radius
Stud Girdle:
Torque: Head Bolts = 65 ft/lb
Rocker Studs = 55 ft/lb
Manifold = 30 ft/lb
Block Use: Any SBF Iron or Aluminum
Weight: 59-61 lbs fully assembled pair.
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