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Registered
Join Date: Dec 1969
Location: chula vista ca usa
Posts: 5,729
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I had a 1963 Sportster and it had about 11 to 1 compression but with the Sifton minus minus cams they had so much over lap that it was never very high except at very high RPMS. The heads and pistons looked about like yours do. Oh yeah, it had a magneto, off of a John Deer tractor with an adapter shaft if I remember correctly but it was a long time ago??!!
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