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Tubman hit the nai lon the HEAD. You must consider the use of a milll like the Bridgeport and consider designing a completly new combustion chanber, using the "Stock one to staart. A new aproach is to remove 70/80 thou from the combustion side of the chanber. Referes to as angle milling, Now using a dremmel clearance for the piston. Now check for valve to head clearance and remote theis material at a 4 deg angle BY playing around tou can make a very small chamber that will still handle a 400 jr cam getting close to 9:1 in a 258ci engine.
Gramps