'66 Slant Six Turbo Build

stop the beast said

Hi moper,

Remember, I didn't reach my peak horsepower because of detonation. Once we can spin it up to 5200-5500 rpms we'll probably see 10-25 more horsepower..

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Do you have forged pistons? How much total spark advance are you running, what octane gas, and what was your A?F ratio when you began to experience detonation.

Our engine is pretty similar to yours but with us running only 8 pounds of boost and using 110 octane gas (and 18 degrees of total spark advance) we haven't seen any detonation, yet.

Thanks a lot for all the good info!!!