Thread: detonation with compression

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I was wondering how to tell if ur motor was experencing detonation......I'm running a 350 with 60cc heads and i was wondering what may i be look at for compression(stock deck height)

Originally posted by jayman54
I was wondering how to tell if ur motor was experencing detonation......I'm running a 350 with 60cc heads and i was wondering what may i be look at for compression(stock deck height)

Might sound like a diesel (Ping), unless you have loud exhaust then it might not be noticable til it's tooooo late.

What kind/size of pistons does it have. Dish / flat top / Dome ....standard bore Oversize?

350 chevy with flat tops and two valve reliefs and .025 deck height is roughly 10.5:1 if you are using a .039 gasket. Now your 278 cam will bleed off a little of that compression but using 92 octane and 38 degrees total timing should be fine.

i was told not to set the timming anymore than 34 degrees max...if i set it to that @ 3000 rpm what should it be reading at idle???

Originally posted by jayman54
i was told not to set the timming anymore than 34 degrees max...if i set it to that @ 3000 rpm what should it be reading at idle???

Stock engine is around 10° BTDC @ 700 RPM