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535133 pistons


Well-known member
What is the compression ratio on these pistons?

Currently have them in my 220

What would the performance difference be between these in a 220 cylinder vs an AV470?
John Fenner said:
Roughly 7.5:1 in an angle valve, almost 9:1 in a 220

John I knew you would chime in at some point

How much of a performance difference would there be seen if I used those pistons in a AV conversion vs if I keep running them in a 220 jug
I would say a considerable drop in power, I would suggest running the 631481 or 648029 in angle valve cylinders.