AFR Cylinder Heads

Custom Piston Worksheet & Order Form (pdf)

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AFR Cylinder Heads_Chevrolet Small Block_23°_235cc_Competition Head_Angle Plug_70cc_Spread Port_Small Bolt Hole_Assembled

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Price $3,530.00

Product Code: AFR-1211-TI

Description

Technical Specs

AFR 235cc "Competition" heads come with 100% CNC machined intake runners, exhaust ports and combustion chambers. The exhaust ports are also spread apart approximately .500 compared to the standard location and feature a Stahl bolt pattern. Equipped with Titanium retainers and high quality components, featuring a 60/40 valve spacing which requires shaft mounted rocker arms for optimum valve train geometry (can be used with .050 offset intake rockers for drag race only applications). AFR heads are available bare (without parts), call our tech line for details.

235cc CNC Ported Intake Runners
.500 Spread Port Exhaust
Small Bolt Hole
A356 Aluminum
8mm Bronze Valve guides
5 angle valve job
Precision CNC machining
Multiple spring options

Assembled heads feature:

8mm Bead Lock Valves
PAC Racing Valve Springs
7/16 ARP Rocker Studs
Adjustable guide plates

www.P65Warnings.ca.gov

Description
Item Code	AFR-1212-TI
Vendor	Air Flow Research
Product Type	Cylinder Heads
Product Model	Competition
Engine Family	Chevrolet 23°
Weight	68

Included Components

Combustion Chamber	100% CNC Ported
Intake Ports	100% CNC Ported
Exhaust Ports	100% CNC Ported - .500 Spread Port
Valve Job	Competition 5 Angle
Intake Valves	8mm Bead Lock Intake Valve - 2.125 x 5.000 Overall Length
Exhaust Valves	8mm Bead Lock Intake Valve - 1.600 x 5.030 Overall Length
Valve Springs	PAC Racing Spring - 1.550 OD - Solid Roller Dual Valve Spring - 250 lbs on seat - .800 maximum lift - 8,000 to 8,200 Max RPM
Retainers	10° Titanium - 1.500 OD x 1.120 ID x .705 ID
Keepers	10° Bead Lock- w/lash cap recess
Rocker Studs	7/16 ARP
Guide Plates	5/16 Adjustable
Valve Seals	.600 OD x .495 ID
Spring Seat Cups	1.550 OD x .780 ID - Hardened
Intake Valve Seat	Ductile Iron - 2.200 OD x 1.750 ID x .375 Deep
Exhaust Valve Seat	Ductile Iron - 1.696 OD x 1.325 ID x .305 Deep
Valve Guides	8 mm Bronze - .502 OD x 2.100 Overall Length

Recommended Components

Intake Gasket	Fel-Pro 1206
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	Fel-Pro 1405
Head Gasket	Fel-Pro 1004 )350 cid) 1014 (400 cid)
Head Bolts	ARP 134-3701
Head Studs	ARP 234-4301
Head Bolt Washers	Manley
Stud Girdle	AFR 6208
Intake Manifold	AFR 4811
Spark Plug Starting Range	Autolite 3922

Specifications and Features

Material	A356 Aluminum
Intake Port Volume	235cc
Intake Port Dimension	2.200 Height x 1.290 Width - 5/16 Radius
Intake Port Location	Stock
Exhaust Port Volume	80cc
Exhaust Port Dimension	1.430 Height x 1.540 Width
Exhaust Port Location	Raised .250
Combustion Chamber Volume	70cc
Valve Cover Bolt Pattern	Perimeter Bolt
Valve Angle	23°
Valve Spring Pocket Diameter	1.580 OD
Max Valve Spring Pocket Machining	1.680 OD
Note	Warning: Do not increase spring pad depth
Deck Thickness	.750
Minimum Bore Diameter	4.000
Flat Mill	.006 per cc 60cc Maximum
Angle Mill	.009 per cc 55cc Maximum
Note	Angle milling may require .120 thick intake gasket
Minimum Cross Sectional Area	2.470 sq in
Spark Plug Dimensions	14mm x .750 w/Gasket Seat
CARB EO Number	Not Emissions Compliant

Flow Chart
Flow Data: cfm @ 28 inches of Water

Lift	.200	.300	.400	.500	.550	.600	.650	.700	.750
Intake	159	221	261	295	311	318	327	331	336
Exhaust	120	165	214	228	237	238	243	245	250

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