biggest valve on stock pistons?
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Joined: Dec 2007
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From: ny
Car: 89 Formula
Engine: LB9 TPI
Transmission: 700R4
Axle/Gears: 3.73(coming soon)
biggest valve on stock pistons?
hi guys whats the biggest valves i can put on stock 89 305 tpi pistons?
i was lookin at heads with intake valve at 1.940 and exhuast at at 1.500
are 1.550 exhuast valves to big?
i was lookin at heads with intake valve at 1.940 and exhuast at at 1.500
are 1.550 exhuast valves to big?
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: biggest valve on stock pistons?
You don't normally need an oversized exhaust valve. The piston's upward movement will always push all of the exhaust gases out of the cylinder. A smaller valve just increases the velocity. I know the 2.02 intake is too big for a 305 bore. When using a 2.02, the common exhaust size is 1.60. Chances are the 1.55 won't be a problem.
The pistons are not the problem. It's the bore size. The tiny bore really limits the size of the valves.
The pistons are not the problem. It's the bore size. The tiny bore really limits the size of the valves.
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