AFR Cylinder Heads

Custom Piston Worksheet & Order Form (pdf)

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AFR Cylinder Heads_Chevrolet_Big Block_24°_305cc_Rectangular Port_121cc_Assembled_Solid Roller

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Price $3,678.00

Product Code: AFR-2100-1

Description

Technical Specs

AFR 305cc rectangle port heads feature partially CNC ported intake, exhaust and chambers, A356 aluminum castings and high quality components throughout. Recommended for moderate street, or street/strip builds with displacements up to 509 cubic inches, operating up to 6500 RPM. Also available with 100% CNC chambers for increased airflow. 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.

305cc 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-2100-1
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	20% CNC Ported
Exhaust Ports	30% CNC Ported
Valve Job	Competition 5 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 - 1.625 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 1.168 ID x .844 ID
Keepers	10° 11/32 Lock w/Lashcap Recess
Rocker Studs	7/16 ARP
Guide Plates	3/8 Adjustable
Valve Seals	11/32 Viton
Spring Seat Cups	1.740 OD x 1.650 ID - Hardened
Intake Valve Seat	Ductile Iron - 2.450 OD x 2.000 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-6855
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 135-3703 (Mark IV) or ARP 135-3707 (Mark V) _ 1.000 longer head bolt required on bottom four bolt holes.
Head Studs	ARP 235-4713
Head Bolt Washers	Manley
Stud Girdle	AFR 6202
Intake Manifold	Victor Jr or Super Victor
Spark Plug Starting Range	Autolite 3924

Specifications and Features

Material	A356 Aluminum
Intake Port Volume	305cc
Intake Port Dimension	2.380 Height x 1.680 Width - 11/32 Radius
Intake Port Location	Stock
Exhaust Port Volume	132cc
Exhaust Port Dimension	1.720 Height x 1.920 Width
Exhaust Port Location	Raised .375
Combustion Chamber Volume	121cc
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 108cc Maximum
Angle Mill	.009 per cc 104cc Maximum
Note	Angle milling may require .120 thick intake gasket
Minimum Cross Sectional Area	2.993 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	.600	.700
Intake	168	242	303	339	360	362
Exhaust	142	187	225	252	271	274

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