1951 a stock piston

crew chief · Nov 8, 2015

Can anyone tell me the distance between rest pin and top of piston ? I pulled piston yesterday and the # on it is a1240 I think it is already high compression but I don't have a stock one to compare it to,, Thank's

Mike N Mo · Nov 9, 2015

Is it a flat top piston, or does it have 2 notches on the edge for the spark plug holes? If it has the notch on each side, it's the higher
compression gas pistons, about 5.6:1 if I remember right. I have the info written down, but I'll have to find it. I moved 6 months ago, and
I'm still trying to find things.

ndbjda · Nov 9, 2015

What you have is an after market piston an M&W more than likely. Will be 6.75 to 1 compression and from center of wrist pin to top of piston is 6.625"

ndbjda · Nov 10, 2015

Sorry my bad, factory cast piston 5.5 from center of wrist pin to top 1/8" shorter than yours. Factory would be 6.5 to 1 compression for a gas piston.

1951 a stock piston

crew chief

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ndbjda

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