Speedmaster Cast Aluminum Cylinder Head Big Block Oldsmobile 400/425/455 w/Hydraulic Flat Tappet Cam
746-PCE281.2152
Product Q&A
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Oldsmobile - Assembled
Special Note: Camshaft and Lifters Not Included
- Intake Runner: 188cc
- Combustion Chamber Volume: 77cc
- Intake Valve: 2.072"
- Exhaust Valve: 1.680"
- Max Lift: .615"
- Coil Bind: .1.125"
- Intake Install: 140 lbs @ 1.8
- Exhaust Install: 140 lbs @ 1.8
- Closed Seat Pressure: 145 lbs
- Open Seat Pressure: 345 lbs
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
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Specifications:
What is the max you could shave these heads to lower c.c volume?
Can i use the original head bolts and the stock rockers and lifters with this head on my 1969 olds 455 ?
Will these heads fit on a 350 or 403 Oldsmobile
What type of intake manifold gasket is needed? Can the factory “bathtub” gasket or is something special required. The car is a collector limited use vehicle.
Do these heads have accommodations for factory brackets, I.e. alt, per steering and AC?
Motor Vehicles
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Tools:
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Electrical Cords
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.