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01-17-2019, 04:36 PM
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VIP Member
Join Date: Dec 2001
Location: Pontiac,il.
Posts: 1,203
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Jr Stock piston rules
I was reading a 1968 NHRA rule book today.It said under the engine rules that you could use any replacement piston "as long as it doesn't increase the compression generally the same in appearance".So on the 1955 265 engine with the flat top piston could you use a piston that had valve reliefs like the 56 and 57 engines had?
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