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Thanks for your response.

From what I can tell, I have hardened seats. I also took the good #1 valve with lapping compound on the #4 seat to lightly clean it up to get a better look. Both cleaned...

I figured out the zero compression in my number 4 cylinder. 6827
All of the other cylinders weighed in at >90 lbs. of compression and the no. 3 was even at 100, though the valve was the next most...