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Big Block Chevy 315cc Rectangle Port 24°Basic Package Components
Competition 3-Angle Valve Job
Intake Valve, 2.250'' x 5.500'' Overall Valve Length
Exhaust Valve, 1.880'' x 5.448'' Overall Valve Length
1.625'' OD PAC Racing Solid Roller Valve Spring, 275 lbs. on seat, .850'' maximum lift, max RPM 7400-7600
10º Manley 4140 Chrome Moly Retainers
10º Valve Locks
7/16'' Rocker Studs
  3/8'' Guide Plates
Viton Valve Seals
Hardened Spring Seat
Intake Valve Seats
Exhaust Valve Seats
Bronze Valve Guides
Big Block Chevy 315cc Rectangle Port 24°Head Specifications
Head Torque w/Moly Lube 75 Ft. Lbs.
Rocker Stud Torque 55 Ft. Lbs.
Intake Port Gasket, 1.720'' x 2.450'' with 1/2'' radius Fel-Pro 375-1275 - DO NOT PORT MATCH Intake Manifold to Fel-Pro Gasket.
Exhaust Port Gasket AFR 033-6858
Head Gasket Mark IV 4.540'' Bore, Fel Pro 375-1017
Head Gasket Mark V - VI Up to 4.500'' Bore, Fel Pro 375-1047
Head Gasket Mark V - VI 4.500'' to 4.600'' Bore, Fel Pro 375-17049
Head Bolts & Studs Standard ARP
Head Bolt Washers Manley Standard
Suggested Manifold Edelbrock 350-2907 & 350-2927 or Brodix 158-HV2000 & 158-HV2001
Spark Plug Starting Range Champion C59C, Autolite 3932
Combustion Chambers 121cc
Intake Port Volume 315cc
Exhaust Port Volume 135cc
Spring Pocket can be cut to 1.750, no deeper.
Valve Spacing Standard
Rocker Arms Standard
Valve Angle 24° / 4° Intake ; 15° / 4° Exhaust
Angle Mill, 104cc Maximum .009'' per cc
Flat Mill, As Cast 108cc, CNC 114cc Maximum .006'' per cc
NOTE: Flat and Angle mills might require a .120'' thick head gasket.



4.31bore flow

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