Proflow does not sacrifice quality for a low price--you get both with our aluminium cylinder heads. The lightweight heads are cast from A-356 aluminium alloy with a large choice of engine, for SB & BB Chevrolet, LS Chev Holden Ford SB 289-351W, 302, 351 Cleveland 2V & 3V & BB FE, and Chrysler SB & BB. They have phosphorous bronze valve guides, and ductile iron valve seats for use with unleaded gas. They're also end-milled and drilled for accessories. The fully assembled heads have stainless steel valves, high performance valve springs, 7 degree valve locks, rocker arm studs, and guideplates.
This BBC cylinder head is recommended for agressive street or street/strip applications with displacements up to 540 cubic inches, operating at or below 6800 RPM. 1.625 O.D. Solid Roller, 275lbs on seat, .850 Maximum Lift.
Material
A356 Aluminum
Intake Port Volume
315cc
Intake Port Dimension
2.450"H x 1.755"W x 13/32 Radius
Intake Port Location
Stock
Exhaust Port Volume
135cc
Exhaust Port Dimension
1.780"H x 2.025" W
Intake Valve Diameter (in):
2.25 in.
Exhaust Valve Diameter (in):
1.880 in.
Combustion Chamber Size
121cc
Valve Springs Pocket I.D.
1.735"
Maximum Valve Lift (in):
0.750 in.
Outside Diameter of Outer Spring (in):
1.625 in.
Lock Style:
10 degree
Rocker Arm Nut Thread Size:
7/16-20 in.
Valve Cover Mounting Style:
Perimeter bolt
Intake Valve Angle:
24/4
Exhaust Valve Angle:
15/4
Valve Guide Material:
Manganese Bronze
Intake Valve Seat Machine Style:
5-angle
Valve Seat Material:
Mental powder
Oiling Style:
Through pushrod
Recommended Components:
Intake Port Gasket
(.120" Thick)
Intake Port Gasket
(.060" Thick)
Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit the heads.
Exhaust Port Gasket
Head Gasket, Fel-Pro #1047 (Mark V and VI),Head Gasket,, Fel-Pro #1017-1 (Mark IV)
