Hey Hank I have to disagree to a point. when I ran my 307s (12-1) with a 194 583-607 lift the pistons were fly cut .225 to clear the valves
When i spoke with the guys over at slefRacing about the compression ,And Only having the CCs from the Head we figured that motor was pushing somewhere between 13.9-1 & 15-1 And THIS was a daily DRIVE for the better part of 17plus yrs
I ran On the street with LCHEAPO 87 oct. This combo also Ran 15.15 All day long Nite or day with 3.08 gears & a 4speed. The Biggest issue was shutting it off With Out loading the clutch Then turn off the key. And It started with just a Bump of the Key. But When I ran the RIGHT Octang It would shut off just fine. BUT anyway my point is
Mine Never made a sound/Ping and I can SHOW you the top of the Pistons If you like. NO marks once so ever. And Im now useing the same set of Pistons in my NEW more But now the Dome has been fly cut even more to clear this new cam of 690-680 lift They have been also fire sloted.
My buddy here also runs a 250 with 307s at about 9.5 -1 on pump gas with a fair(mild) bump stick the car runs in the mid 14s on 91 oct.And the Block has not been decked.
PS oh yeah there maybe a mark or two FROM When I had a cam Gear brake ripped the teeth off it @5500 because when The motor was first Built they didn't put the gear on like i told them Which needed to be heated. but anyway Bottom line is when it broke I bent everyone of the intake valves and 7 push rods OOPS motor was less then a week old.
God doesn't like ugly.
