Proflow Cylinder Heads, AirMax 320, Aluminium, BB Chevrolet, Assembled, 120cc Chamber, 315cc Intake Runner, Pair - PFEAHBB315121
Part Number: PFEAHBB315121
Proflow Cylinder Heads, AirMax 320, Aluminium, BB Chevrolet, Assembled
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 | Ā | Ā |
| Intake Port Volume | 315cc | Ā | Ā |
| Intake Port Dimension | 2.450"H x 1.755"W x 13/32 Radius | Ā | Ā |
| Intake Port Location | Stock | Ā | Ā |
| Exhaust Port Volume | 135cc | Ā | Ā |
| Exhaust Port Dimension | 1.780"H x 2.025" W | Ā | Ā |
| Intake Valve Diameter (in): | 2.25 in. | Ā | Ā |
| Exhaust Valve Diameter (in): | 1.880 in. | Ā | Ā |
| Combustion Chamber Size | 121cc | Ā | Ā |
| Valve Springs Ā Pocket I.D. | 1.735" | Ā | Ā |
| Maximum Valve Lift (in): | 0.750 in. | Ā | Ā |
| Outside Diameter of Outer Spring (in): | 1.625 in. | Ā | Ā |
| Lock Style: | 10 degree | Ā | Ā |
| Rocker Arm Nut Thread Size: | 7/16-20 in. | Ā | Ā |
| Valve Cover Mounting Style: | Perimeter bolt | Ā | Ā |
| Intake Valve Angle: | 24/4 | Ā | Ā |
| Exhaust Valve Angle: | 15/4 | Ā | Ā |
| Valve Guide Material: | Manganese Bronze | Ā | Ā |
| Intake Valve Seat Machine Style: | 5-angle | Ā | Ā |
| Valve Seat Material: | Mental powder | Ā | Ā |
| Oiling Style: | Through pushrod | Ā | Ā |
| Ā | Ā | Ā | Ā |
| Recommended Components: | Ā | Ā | |
| Intake Port Gasket | Ā (.120" Thick) | Ā | Ā |
| Intake Port Gasket | (.060" Thick) | Ā | Ā |
| Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit the heads. | Ā | Ā | |
| Exhaust Port Gasket | Head Gasket, Fel-Pro #1047 (Mark V and VI),Head Gasket,, Fel-Pro #1017-1 (Mark IV) | ||
| Head Bolts, 7/16"-14 x 7/16"-14 ARP 235-7202 | ARP 135-3703 (Mark IV), ARP 135-3707 (Mark V),ARP 235-4713 | ||
| Head Bolt Washers, | Ā Manley | Ā | Ā |
| Stud Girdle | 7/16 Stud Mount Rocker Arms - 1.7 Ratio (For Optimized Geometry) | ||
| Ā | 1.7 Shaft Mount Rocker Arms T&D | Ā | Ā |
| Suggested Manifold | Victor Jr,Super Victor | Ā | Ā |
| Spark Plug Starting Range | Pump Gas 3924 / Race Gas 3922 | Ā | Ā |
| Ā | Ā | Ā | Ā |
| 11/32" Intake Valve, 2.250" x5.500" O.A.L | Ā | Ā | Ā |
| 11/32" Tulip Exhaust Valve, 1.880" x 5.450" O.A.L | Ā | Ā | Ā |
| Ā Racing Spring #1224 1.625 O.D. Solid Roller, 275lbs on seat, .850 Maximum Lift, Max RPM 7400-7600 | Ā | Ā | |
| 10Ā° Ā Retainers 1.490" O.D x 1.180" I.D x .765" I.D | Ā | Ā | Ā |
| 10Ā° 11/32" Valve Locks with lashcap recess | Ā | Ā | Ā |
| Ā 7/16" Rocker Exhaust Studs | Ā | Ā | Ā |
| 7/16" Rocker Intake Studs | Ā | Ā | Ā |
| 3/8" Guide Plates | Ā | Ā | Ā |
| 11/32" Viton Valve Seals | Ā | Ā | Ā |
| Hardened Spring Cup 1.740" O.D / 1.650" I.D | Ā | Ā | Ā |
| 11/32" Intake Manganese Bronze Valve Guides .502" O.D x 2.10" O.A.L | Ā | Ā | Ā |
| 11/32" Exhaust Maganese Bronze Valve Guides .502" O.D x 2.25" O.A.L | |||
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