AFR Cylinder Heads

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AFR Cylinder Heads_Chevrolet_Big Block_24°_300cc_Oval Port_112cc_Assembled_Solid Roller

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Price $3,876.00

Product Code: AFR-3680

Description

Technical Specs

AFR 300cc Oval Port heads feature 100% CNC ported intake, exhaust and chambers, A356 aluminum castings and high quality components throughout. Recommended for aggressive street, street/strip or race builds with displacements up to 540 cubic inches, operating up to 6800 RPM. Component upgrades and machining options are available to customize AFR Heads to your specific build. AFR heads are available bare (without parts), call our tech line for details.

300cc CNC Ported Intake Runners
A356 Aluminum
11/32 Bronze Valve guides
5 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-3680
Vendor	Air Flow Research
Product Type	Cylinder Heads
Product Model	Magnum
Engine Family	Chevrolet 24°
Weight	94

Included Components

Combustion Chamber	100% CNC Ported
Intake Ports	100% CNC Ported
Exhaust Ports	100% CNC Ported
Valve Job	Competition 5 Angle
Intake Valves	11/32 Intake Valve - 2.300 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 - 1.625 OD - Solid Roller Dual Valve Spring - 275 lbs on seat - .850 maximum lift - 7,400 to 7,600 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 Adjustable
Valve Seals	.600 OD x .495 ID
Spring Seat Cups	1.550 OD x .780 ID - Hardened
Intake Valve Seat	Ductile Iron - 2.450 OD x 1.950 ID x .375 Deep
Exhaust Valve Seat	Ductile Iron - 2.000 OD x 1.580 ID x .375 Deep
Valve Guides	11/32 Bronze - .502 OD x 2.100 Overall Length (Intake) - 11/32 Bronze - .502 OD x 2.250 Overall Length (Exhaust)

Recommended Components

Intake Gasket	AFR-6863
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 1017-1 (Mark IV) _ Fel-Pro 1047 (Mark V or VI)
Head Bolts	ARP 135-3702
Head Studs	ARP 235-4713
Head Bolt Washers	Manley
Stud Girdle	AFR 6202
Intake Manifold	Performer RPM, Air Gap, or Victor Jr.
Spark Plug Starting Range	Autolite 3924

Specifications and Features

Material	A356 Aluminum
Intake Port Volume	300cc
Intake Port Dimension	2.030 Height x 1.830 Width - 1/2 Radius
Intake Port Location	Stock
Exhaust Port Volume	135cc
Exhaust Port Dimension	1.770 Height x 2.010 Width
Exhaust Port Location	Raised .375
Combustion Chamber Volume	112cc
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	.750
Minimum Bore Diameter	4.250
Flat Mill	.006 per cc 60cc Maximum
Angle Mill	.009 per cc 102cc Maximum
Note	Angle milling may require .120 thick intake gasket
Minimum Cross Sectional Area	2.640 sq in
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	.550	.600	.650	.700
Intake	165	240	300	345	369	380	390	394
Exhaust	135	185	234	266	285	295	301	314

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