AFR Cylinder Heads

Custom Piston Worksheet & Order Form (pdf)

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AFR Cylinder Heads_Chevrolet_Big Block_24°_325cc_Enforcer Series_Rectangular Port_122cc_Assembled_Hydraulic Roller

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Price $864.00

Product Code: AFR-3001

Description

Technical Specs

The all new AFR 325cc Enforcer cylinder heads got the Big Block Chevrolet are a permanent mold casting and feature an “As‐Cast” surface on the intake runners, exhaust runners and combustion chambers. This budget friendly offering is available as a “No Parts” head or can be ordered fully assembled with the same great components found in our higher end cylinder heads; such as ARP rockers studs, PAC Racing springs, Viton valve seals, hardened spring cups, ductile iron seats, machined locks, AFR guide plates and stainless steel valves. Sold as a single piece, 2 pieces are required per engine.

325cc CNC Ported Intake Runners
A356 Aluminum
11/32 Bronze Valve guides
3 angle valve job
Precision CNC machining
Multiple spring options

Assembled heads feature:

11/32 Intake Valves
11/32 Nail Head Exhaust Valves
PAC Racing Valve Springs
7/16 ARP Rocker Studs
3/8 Adjustable guide plates

www.P65Warnings.ca.gov

Description
Item Code	AFR-3001
Vendor	Air Flow Research
Product Type	Cylinder Heads
Product Model	Enforcer
Engine Family	Chevrolet 24°
Weight	42

Included Components

Combustion Chamber	As Cast
Intake Ports	As Cast
Exhaust Ports	As Cast
Valve Job	3 Angle
Intake Valves	11/32 Intake Valve - 2.250 x 5.500 Overall Length
Exhaust Valves	11/32 Nail Head Exhaust Valve - 1.880 x 5.450 Overall Length
Valve Springs	PAC Racing Spring - 1.550 OD - Hydraulic Roller Dual Valve Spring - 175 lbs on seat - .725 maximum lift - 6,500 to 6,700 Max RPM
Retainers	10° Manley Chrome Moly - 1.500 OD x 1.120 ID x .705 ID
Keepers	10° 11/32 Lock w/Lashcap Recess
Rocker Studs	7/16 ARP
Guide Plates	3/8
Valve Seals	11/32 Viton
Spring Seat Cups	1.550 OD x .705 ID - Hardened
Intake Valve Seat	Ductile Iron
Exhaust Valve Seat	Ductile Iron
Valve Guides	Bronze

Recommended Components

Intake Gasket	AFR-6856
Note	Important: Do not use your AFR gasket as a template to port match your intake manifold as one AFR gasket is used for many AFR runner volumes.
Exhaust Gasket	AFR-6858
Head Gasket	Fel-Pro 1047 (Gen V and VI) _ Fel-Pro 1017-1 (Gen IV)
Head Bolts	ARP 135-3703 (Gen IV) or ARP 135-3707 (Gen V)
Head Studs	ARP 235-4713
Head Bolt Washers	Manley
Stud Girdle
Intake Manifold	Victor Jr or Super Victor
Spark Plug Starting Range	Autolite 3924

Specifications and Features

Material	A356 Aluminum
Intake Port Volume	325cc
Intake Port Dimension	2.510 Height x 1.820 Width - 3/8 Radius
Intake Port Location	Stock
Exhaust Port Volume	140cc
Exhaust Port Dimension	1.690 Height x 1.900 Width
Exhaust Port Location	Raised .375
Combustion Chamber Volume	122cc
Valve Cover Bolt Pattern	Perimeter Bolt
Valve Angle	24/4° Intake _ 15°/4° Exhaust
Valve Spring Pocket Diameter	1.725 OD
Max Valve Spring Pocket Machining	1.750 OD
Note	Warning: Do not increase spring pad depth
Deck Thickness	.450
Minimum Bore Diameter	4.250
Flat Mill	.006 per cc 105cc Maximumas cast
Angle Mill	.009 per cc 100cc Maximumas cast
Note	Angle milling may require .120 thick intake gasket
Minimum Cross Sectional Area
Spark Plug Dimensions	14mm x .750 w/Gasket Seat
CARB EO Number

Flow Chart

Flow Data: cfm @ 28 inches of Water

Lift	.200	.300	.400	.500	.600	.700
Intake	140	207	265	296	336	355
Exhaust	119	175	211	239	249	255

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