Engine melt down
Background:
Stock Model A engine added 5.5 Snyder's head. Used new silicone gasket. About 100 miles since head change.
Problem:
Engine was running strong. Touring at about 50 mph some smoke started coming out tail pipe. Started up a hill smoke increased. Pulled over engine running rough lots of oily smoke out rear and blow by coming out oil filler tube. Temperature gauge did not show high reading.
Dismantle Engine:
Cylinders were 0.100" over-bore. Crank measured 0.060" under. #4 piston had rings fused to piston. #4 cylinder walls had aluminum particle score marks. The exhaust valve for #4 cylinder was bend and the valve would not close. Head gasket looked OK. No apparent damage to head.
Question:
What are the possible reasons for the melt down ?
Bob
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