Re: 427 engine..
My guess is that the 7115 cranks were probably used with the heavier open chamber 12.5:1 domed pistons for the L88 and ZL1 since the counterweights are slightly wider for balancing purposes. The 396 and 427 11:1 closed chamber pistons were lighter and worked with the narrower counterweighted 6223 crank.
Paul
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70 Camaro LA Z-28 03B Citrus Green LT-1 M-40 3.73's
69 Camaro X-77 Z-28 10C Cortez Silver M-21 3.73's Deluxe Project X - SOLD
69 Camaro X-77 Z-28 01B Garnet Red w/Black top, M-20 3.73 Deluxe Houndstooth
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