Looks like this isn't going to workout as planned. Skipped the piston pin location height on the 3.75 vs 4.21 stroke cranks.
Pistons are raw/ machined to specs TRW 2394d std bore. Bought years ago for a project that changed directions. With -19.3 cc dome, they would yield a 12.5:1 CR in a roundport 455. This would be less in a 400, however, overloooking the piston pin height throws this off.
Was worth investigating.
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1972 HO Trans Am auto White/white
1974 SD Trans Am 4 spd, no a/c dk blue/ white & blue
1978 Trans am gold/ black ,T56, t tops, EFI 474,
Build: http://www.pro-touring.com/showthrea...1978+g+machine
1999 30th Trans Am 6 spd, T top
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