Originally Posted by Riding Rich
47.1291cc / 5cc = 9.43 : 1 "SOUNDS LIKE TIRE SKIDDING TO ME"
I wouldn't reccommend going much higher without some serious octane.
This is also about the same as the Rock Solid Billet head.
Yes. I was trying to explain to someone last week that the Zoom slant was near or beyond the limit of practical compression and the billet had no advantage in that dept..
Are we saying the PK80J "80cc" is really 50cc?