235CC SBC RACE CYLINDER HEAD

$3,389.28

SOLD AS A PAIR

Option 1:



Option 2:

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
1130-TI

235cc SBC Race Cylinder Head



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1136-TI

235cc SBC Race Cylinder Head



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