AFR 1351 SBF 185 Enforcer Cylinder Heads, Assembled

$647.64 Buy It Now or Best Offer
free,30-Day Returns

Seller Store speedway_motors
(294115) 99.5%,

Location: Lincoln, Nebraska
Ships to: US,
Item: 266524945167

Return shipping will be paid by:Seller
Returns Accepted:Returns Accepted
Item must be returned within:30 Days
Refund will be given as:Money Back
Return policy details:
Air Flow Research:Air Flow Research
Type:Cylinder Heads
Material:Aluminum
Manufacturer Part Number:1351
Finish:Natural
California Prop 65 Warning:True

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. AFR 1351 SBF 185 Enforcer Cylinder Heads, Assembled Sku # 1631351 Mfr. Part # 1351 Condition New Brand Air Flow Research 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 Related Items / Suggested Parts Fel-Pro 1011-1 1962-1984 Small Block Ford Head Gasket ARP 154-3603 Ford Small Block Head Bolt Kit, Hex Head Autolite A3924 Spark Plugs for Edelbrock Flathead Ford Heads Tech Support We’re here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through eBay Messaging and a knowledgeable Speedway Motors team member will be happy to help. About Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 72 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.

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