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I would braze it & retap the hole.

First I would like to thank all of you for your reply I really appreciate it. The reason for this post is exactly to have a basic understanding (or warning) from people with knowledge in order to make an educated decision as to where to go with the buildup, which is what I always do before I...

I will choose after I was looking for that number to decide for the rest. If it doesn't make sense let me know I will gladly take advise. Thank you.

Maybe I should be looking at max compression pressure which depend where the intake valve close? I'm curious of the maximum(safe) dynamic compression a gas engine can be build on 91 octane gasoline without having premature detonation. Thank you. Robert

Thank you very much for your reply, I'm that much closer to what I'm looking for, I have a real life ratio.

So 10:1 static would be a ball park. So what I was wondering is what would be a safe dynamic ratio? There must be a # for any gas engine in general?

What would be the maximum safe compression ratio for a street use big block with aluminum head on 91 octane gas? Thank you. Robert