Quote:
Originally Posted by geeteeohguy
I have wiped out a 428 due to inaudible detonation. Never heard a thing. Perfect hearing.
5 broken pistons and pounded out bearings.
I ran Edelbrock water injection on my '67 GTO in the late 1980's with the stock 670 heads and 92 octane gas. Didn't help. Had to retard the hell out of the timing. Changed the heads later on to 87cc iron heads.
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Did the 5 pistons break ring lands? Was it a single pattern cam?
Having something like that with no warning will make anyone gun shy on compression.
I attached a screen shot of the compression and photo of one my 91 octane pump gas Pontiac engines. It has headers, other than that it looks like a bone stock smog engine. Modification are on the inside.