Our 235cc "Competition" heads come with 100% CNC machined intake runners, exhaust ports and combustion chambers. 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).
Included Components | ||
100% CNC Ported Combustion Chambers | ||
100% CNC Ported Exhaust Ports | ||
100% CNC Ported Intake Ports | ||
Competition 5-angle Valve Job |
||
8mm Bead Lock Intake Valve, 2.125" x 5.00" long O.A.L. | ||
8mm Bead Lock Exhaust Valve, 1.600" x 5.030" long O.A.L. | ||
PAC Racing Springs 1.550" OD Solid Roller Dual Drag Race Spring, 250 lbs on seat, .800" maximum lift, Max RPM 8000-8200 | ||
10° Titanium Retainers 1.500” O.D x 1.120” I.D x .705” I.D | ||
10° Bead Lock Valve Keepers with lashcap recess | ||
ARP 7/16" Rocker Studs | ||
Adjustable 5/16" Guide Plates | ||
Viton Valve Seals .600" O.D x .495" I.D | ||
Hardened Valve Spring I.D Locator 1.550” O.D x .780” I.D | ||
Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" I.D x.375" Deep | ||
Ductile Iron Exhaust Valve Seats 1.696" O.D x 1.325" I.D x .305" Deep | ||
8mm Bronze Valve Guides .502" O.D x 2.100" O.A.L |
235cc Competition Flow Chart | |||||||||
.200 | .300 | .400 | .500 | .550 | .600 | .650 | .700 | .800 | |
Int | 159 | 221 | 261 | 295 | 311 | 318 | 327 | 331 | 336 |
Exh | 120 | 165 | 214 | 228 | 237 | 238 | 243 | 245 | 250 |
Test conducted at 28" of water (pressure) on Superflow 600
Bore Size: 4.155", intake 3/4" radius plate exhaust, 1 7/8" curved pipe
Specifications & Features: | |
Material |
A356 Aluminum
|
Intake Port Volume |
235cc
|
Intake Port Dimension |
2.200" H x 1.290" W 5/16 Radius
|
Intake Port Location |
Stock
|
Exhaust Port Volume |
80cc
|
Exhaust Port Dimension |
1.430" H x 1.540" W
|
Exhaust Port Location |
.250" Raised
|
Combustion Chamber Size |
70cc or 80cc
|
Valve Cover Bolt Pattern |
Perimeter Bolt
|
Valve Angle |
23°
|
Valve Spring Pocket Diameter |
1.580" O.D
|
Max Valve Spring Pocket Machining |
1.680" O.D
|
Warning: Do not machine spring pad any deeper. | |
Deck Thickness |
.750"
|
Minimum Bore Diameter |
4.000"
|
Flat Mill |
.006" per cc 65cc Maximum
|
Angle Mill |
.009" per cc 60cc Maximum
|
Note: Angle mills might require .120" Thick intake gasket. | |
Minimum Cross Sectional Area |
2.470 sq. in.
|
Spark Plug Dimensions |
14mm x .750" w/Gasket Seat
|
CARB Status: 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 $37,500 PER VIOLATION PER VEHICLE, REVOCATION OF REGISTRATION BY DMV, LOSS OF USE ON PUBLIC RIGHT OF WAYS AND PROOF OF CORRECTION OF THE TAMPERING. |
Recommended Components: | |
1.5 T&D Shaft Mount w/ .450" off-set | |
1.6 T&D Shaft Mount w/ .450" off-set | |
1.6 Stud Mount Rocker Arms, Hardland Sharp .050 offset | |
1.5 Stud Mount Rocker Arms, Hardland Sharp .050 offset | |
Intake Gasket | |
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 Port Gasket | |
Head Gasket, 350cid Fel-Pro #1004 | |
Head Gasket, 400cid Fel-Pro #1014 | |
SB Chevy Head Bolt Kit, ARP #134-3701 | |
SB Chevy Head Stud Kit, 12 Point Nuts, ARP #234-4301 | |
Head Bolt Washers, Manley | |
Stud Girdle AFR Offset | |
Suggested Manifold | |
Suggested Manifold | |
Spark Plug Starting Range |
Autolite 3922
|
Item# | Description | Qty. | MSRP | Your Price | ||
---|---|---|---|---|---|---|
1130-TI |
235cc SBC Race Cylinder Head |
$3,389.28 |
ADD TO CART
|
|||
1132-TI |
235cc SBC Race Cylinder Head |
$3,389.28 |
ADD TO CART
|
|||
1134-TI |
235cc SBC Race Cylinder Head |
$3,389.28 |
ADD TO CART
|
|||
1136-TI |
235cc SBC Race Cylinder Head |
$3,389.28 |
ADD TO CART
|
Footnotes
AFR Small Block Chevy
General Recommendations for AFR Cylinder Heads:
You’ll be first to know about Air Flow Research products, discounts and special events!