AFR 3002 BBC 325 Enforcer Cylinder Heads, Bare

Description

Heads are designed for 3/8" 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., For ideal geometry and wipe pattern AFR strongly recommends AFR stud mount rockers part #6043 for applications below 7400 RPM and .790 lift. For applications above these limits shaft mount rockers are typically advised.
AFR 3002 BBC 325 Enforcer Cylinder Heads, Bare
Sku # 1633002
Mfr. Part # 3002
Condition
New
Brand
Air Flow Research
Sold
Each
Details
Info
AFR's 325cc BBC 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 509 to 540 Cubic Inch operating below 6500 RPM.
AFR Big Block Chevy
With some domed aftermarket pistons, it may be necessary to slightly clearance or modify the piston due to our more efficient heart shaped combustion chamber design. Most of the newer designed dome profiles will clear. AFR strongly recommends material be removed from the piston and not the cylinder head. Our combustion chamber shapes are very critical to flow and altering the cylinder head can adversely affect flow and power production. It is the customers responsibility to verify proper piston to head clearance.
Heads are designed for 3/8" 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.
For ideal geometry and wipe pattern AFR strongly recommends AFR stud mount rockers part #6043 for applications below 7400 RPM and .790 lift. For applications above these limits shaft mount rockers are typically advised.
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 ,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
Bare
Spark Plug Style
Angle
Intake Port Location
Standard
Intake Port Shape
Rectangle
Exhaust Port Shape
Rectangle
Exhaust Port Location
Raised
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
CNC-Machined Combustion Chamber
No
Intake Valves Included
No
Valve Spring Included
No
Damper Spring Included
No
Retainers Included
No
Locks Included
No
Rocker Arm Studs Included
No
Rocker Arm Nuts Included
No
Guideplates Included
No
Accessory Bolt Holes Drilled
Yes
Valve Seats Machined
Yes
Steam Holes Drilled
No
Machined for O-Ring
No
Heat Crossover
No
Valve Guides Included
No
Valve Stem Seals Included
No
Intake Valve Diameter
2.25
Exhaust Valve Diameter
1.88
Rocker Arms Included
No
Intake Runner Volume Range
320cc - 329cc
Exhaust Runner Volume Range
140cc - 149cc
Combustion Chamber Volume Range
120cc - 129cc
CNC-Machined Runners
No
Exhaust Valves Included
No
MFG. Part #
3002
Exhaust Valve Angle
15
Intake Valve Angle
24
Combustion Chamber Volume
122cc
Exhaust Runner Volume
140cc
Intake Runner Volume
325cc
Related Items / Suggested Parts
Fel-Pro 10171 Head Gasket, Big Block Chevy
ARP 135-3703 BBC Aluminum / Iron Dart Cylinder Head Bolts
Autolite A3924 Spark Plugs for Edelbrock Flathead Ford Heads
Tech Support
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