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Re: Need help with my first 350 sbc
Might try advancing the timing another 10 and see if things improve. Doesn't require you to open anything or replace things.
If the only thing that changed between the motor running good and now is the replacement of the harmonic balancer, bad timing is a leading suspect. The 'air comes out, I am on compression' is good for finding the compression stroke but not for exact TDC. Very possible the mark on the balancer isn't matched to your timing indicator. Parts QA isn't always what it should be. You could still be very much ATC on your timing.
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