Thread: Should I get new heads?

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Originally Posted by Gerald Streeks

The current heads were just redone with z28 springs new valve guides and seals. I just think that the 76-78cc open chamber head is killing my compression. And I don't need upper rpm I don't turn the motor over 5500 rpm. The motor is in a 73 3/4 ton truck with 31 10.50's on it.

You did'nt say what gear you have.
Also you did'nt say if you had a looser stall in it.
I.M.O.,I would look at a 1,800-2,000 stall.
With that tall a tire I would put more gear in it.
Those are big tires to try and move.

I've learned the hard way, you don't want high compression in a truck engine. Stay around 9.0 or less. A light car never has to pull long, the speed increases and the engine revs up. A truck will soon overheat the chambers and start detonation, forcing a downshift.