Bigal75
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if I were to swap them out for some Edelbrocks how much compression would I loose? Let's say I start with 10:1
915's to open chamber heads...
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lewtot184
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you'd loose about .5 point in compression but may increase your chances of detonation due to going to a non-quench.
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Very Slight chance maybe especially with the 84cc chambers, but they will flow so damn much better than the stock cast iron heads....
Bigal75
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Right, maybe I'm better off freshening up the 915's. There's another engine in the works anyway.
Meep-Meep
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Yes, about a half point on a 440.
The open chamber heads still have quench but just not as much as the OEM closed chamber. Edelbrock heads also have a closed chamber but the CC's are roughly equal to the 906 head. This was probably done to maintain the factory compression ratio for a true bolt on performance solution.
The open chamber heads still have quench but just not as much as the OEM closed chamber. Edelbrock heads also have a closed chamber but the CC's are roughly equal to the 906 head. This was probably done to maintain the factory compression ratio for a true bolt on performance solution.
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