AFR 1351 SBF 185 Enforcer Cylinder Heads, Assembled

Mfr. Part # 1351

Condition

New

Brand

best_parts21

Sold

Each

Details

Info

AFR's 185cc SBF Enforcer Cylinder heads feature our Permanent Mold “As-Cast” Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for extremely accurate and repeatable port location/performance. This budget friendly head is perfect for your 302 to 363 Cubic Inch operating below 6000 RPM.

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. Sold as a single piece, 2 are required per engine.

AFR Small Block Ford

• We strongly recommend using 7/16" rocker studs with today's fast cam rates and RPM capabilities as 3/8" Rocker Studs can occasionally break.
• Heads with 1.625" O.D springs will require some springs to be removed for access to some head bolts when installing the heads.
• Heads are designed for 5/16" pushrods, Larger pushrods will not fit without clearancing and is not recommended since some areas are very thin. AFR recommends the use of .120" thick-wall pushrods.

General Recommendations for AFR Cylinder Heads:

• Bar Codes - Please keep the bar code & paperwork shipped with your head, these contain all the specs for your heads when calling AFR.
• High Volume/Pressure Oil Pumps - If you are using a high volume or high pressure oil pump it can submerge the valve seals in oil causing smoking or oil consumption. Your block manufacturer or engine builder can recommend oil restrictions to the top end/valve train components.
• Pushrods - Different length pushrods might be required, always check pushrod length. Check pushrod clearance with heads placed on the block before final assembly. Larger pushrods will not fit without clearancing and is not recommended since some areas are very thin. AFR recommends the use of .120" thick-wall pushrods.
• Mills - Flat or angle mills could affect flow numbers and might require a thicker intake gasket.
• Stud Girdles - Due to many available factory OEM and aftermarket style/variations your existing stud girdle may not fit (AFR heads require AFR Stud Girdles)
• Boosted/Nitrous Applications - We strongly recommend considering Inconel exhaust valves and AFR's optional heavy duty intake valve for power adder applications. Since boosted or nitrous oxide applications accelerate RPM quickly, additional spring pressure is required. We strongly recommend upgrading your valve springs or increasing your valve spring pressures since boost pressure on the valve reduces spring tension. For example, 15lbs boost on a 2.125 OD valve reduces the springs closed seat pressure by approximately 40-45lbs.
• All MARINE Applications - We strongly recommend Inconel exhaust valves & also offer a hard anodized coating to slow the effects of corrosion. Please see note on guide clearance below.
• Valve Guide Clearance - Your AFR Heads come with proper guide clearance (.0012"-.0016") for most applications. Boosted/Nitrous or marine applications might require additional clearance and it is the customer's responsibility to verify proper clearance in these applications.
• Valve Springs - Forced induction, nitrous oxide and cams with aggressive ramp rates may require additional spring pressure. We offer optional valve springs for these types of applications. AFR also recommends the use of billet cam cores and short travel Hydraulic Roller lifters which tolerate higher spring loads. Please don't hesitate to contact us directly if you question which spring is correct for your application.
• AFR Titanium Valves - Might require lash caps and different length pushrods. Titanium valves are coated, do not grind valves because it removes the protective coating.
• Piston to Valve - AFR assumes no responsibility for damage if the end user builds an engine without properly verifying he has enough piston to valve clearance (depth and radial clearance both checked). We recommend a minimum depth of .080" on the intake valve and .100" on the exhaust with a radial clearance of .020" minimum around the perimeter of each valve. Clay is recommended to visually verify both depth as well as radial clearance. Just checking depth is not enough, the position of the valve pocket must also be addressed. It is the customers responsibility to verify proper piston to valve clearance.
• CNC Porting - Occasionally a 100% CNC ported head might have a very small area left "as cast", this in no way affects performance.
• Shaft Mount Rockers - Shaft mount rockers might require additional clearance for proper pushrod fitment. Do not clearance the push rod area as the wall is .060" thick. If you use Jesel Shaft Mounts, AFR only recommends their Pro Series.
• Comp Cams Pro Magnum Rockers - Typically these rocker arms do not clear a 1.500" O.D retainer. A lash cap is required to space up the rocker arm.
• Spring Installation - To ease installation with 1.550" O.D or larger springs, 12 pt head bolt or studs are recommended for extra clearance. Beveled or ground washers might be needed (ARP #200-8504 comes with smaller O.D and doesn't need to be ground)
• Valve Spring Installed Heights - AFR valve spring installed height spec is +/- .015 which is the smallest shim available for adjustment.
• Rocker Arms - Use full roller rocker arms, roller tip rockers with stock style bodies are NOT recommended.

THESE PRODUCTS ARE ILLEGAL TO OPERATE ON ANY PUBLIC HIGHWAY. THIS MEANS ANY PUBLIC PAVED OR UNPAVED ROADWAY OR IN A PUBLIC PARK. THESE PRODUCTS ARE ONLY LEGAL IF USED ON A DEDICATED RACING VEHICLE. VIOLATION ARE SUBJECT TO A MAXIMUM PENALTY OF $37,500 PER VIOLATION PER VEHICLE, REVOCATION OF REGISTRATION BY DMV, LOSS OF USE ON PUBLIC RIGHT OF WAYS AND PROOF OF CORRECTION OF THE TAMPERING.

Charts

(PDF)

Specs

Material Type

Aluminum

Sold in Quantity

Each

Finish

Natural

Cylinder Head Style

Assembled

Spark Plug Style

Angle

Intake Port Location

Standard

Intake Port Shape

Rectangle

Exhaust Port Shape

Square

Exhaust Port Location

Standard

Number of Springs Per Valve

Dual

Retainer Material

Chromoly Steel

Lock Style

7 Degree

Valve Stem Seal Material

Viton

Valve Stem Seal Type

Positive Stop

Valve Cover Mounting Style

Perimeter Bolt

Valve Seat Machine Style

3-angle

Valve Seat Material

Ductile Iron

Oiling Style

Through Pushrod

Combustion Chamber Style

Heart

Combustion Chamber Volume

59cc

CNC-Machined Combustion Chamber

No

Intake Valves Included

Yes

Valve Spring Included

Yes

Damper Spring Included

No

Retainers Included

Yes

Locks Included

Yes

Rocker Arm Studs Included

Yes

Rocker Arm Nuts Included

No

Guideplates Included

Yes

Accessory Bolt Holes Drilled

Yes

Valve Seats Machined

Yes

Steam Holes Drilled

No

Machined for O-Ring

No

Heat Crossover

No

Valve Guides Included

Yes

Valve Stem Seals Included

Yes

Intake Valve Diameter

2.02

Exhaust Valve Diameter

1.6

Guideplate Pushrod Size

0.312

Valve Guide Material

Bronze

Exhaust Valves Included

Yes

Rocker Arms Included

No

Intake Runner Volume Range

180cc - 189cc

Exhaust Runner Volume Range

60cc - 69cc

Combustion Chamber Volume Range

50cc - 59cc

Exhaust Runner Volume

64cc

Intake Runner Volume

185cc

CNC-Machined Runners

No

Spring Diameter

1.29

Maximum Lift

0.600

Intake Valve Angle

20

MFG. Part #

1351

Exhaust Valve Angle

20

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• We ship within Three business days of payment, usually sooner.
• We use a selection of shipping services such as UPS, FedEx, USPS etc.
• We only ship to the lower 48 states, no APO/FPO addresses or PO Boxes allowed.
• Local pickups and combined shipping options are not provided at this time.

• You can return a product for up to 30 days from the date you purchased it.
• Any product you return must be in the same condition you received it and in the original packaging

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• If you have any problem with your order, please contact us and we will do our best to make you satisfied.