Quote:
Originally Posted by Desoto291Hemi
I’m with the others,,,try the timing .
If it didn’t rattle before,,,,why would it start after boring it an extra.030 ?
And the extra bore shouldn’t really affect the cylinder head clearance that much .
10.9 CR sounds kind of high to me,,,,,check your dimensions and calculations.
Pete and old Ron,,,,and the others know a ton more than I do,,,listen to them .
Tommy
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This engine was built when 100 octane was available at the pump. My dad bought it it 1976 well after it was retired. I pulled it apart and saw that it was worn 3 5/16 so took it out to .030. It then sat for many years and I ended up with it. Put it in a highboy several years ago and took it around the block a few times with 91 non eth but never really put my foot in it. So now the car is pretty much done it it has a small rattle if you get into it.
If you think my 10.9 to 1 is off, it may be. Help me calc the comp ratio. 3 5/16 plus .030 bore. 4" stroke. Domed pistons .125 dome height. .070 gasket thickness. And the outer edge of piston flush with deck at top dead center. Combustion chamber is 58cc's on my last check. I do not know volume of the relief.