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Old 05-03-2010, 11:33 AM
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something else I just thought of.. since you mentioned low piston height.. I remembered I have a picture of my engine while I was building it.. the pistons are about as flush with the top of the deck as you would care to get them.. so i dont' think it's THAT.. but I could be wrong..

New pistons in the block

also found this pic.. shows both ends of the heads if the casting marks help any

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Old 05-03-2010, 03:18 PM
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Ok, i remember that head now but didn't realize it was used on 350's, the 69cc I was familiar with was on the last 327's, and we've established that the pistons are correct. Be aware that compression ratio charts like the one you have shown are figure with a piston at zero deck height but most all pistons are .025 down the bore. The 2256 is this way, you have acrually around 9.5-1, whichn is still high enough to have detonation problems like you stated at some times.

Cam should be fine but still the possibility of it being retarded as it wasn't degreed in.

I'll have to think on this a bit and see if I can come up with anything else to look at.
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Old 05-05-2010, 10:53 PM
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cool.. Thanks for the help.. at least, we have ruled out a number of other variables...

when i get my car back home hopefully in another month or so (it's where I work getting some new quarters and stuff) i'll see about tearing the front off the engine and gettin a degree wheel on it.. if it comes up straight up.. I might move it to +4. i have a 3-way adjustable timing set on it..
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