1968-1969 (only!) Olds 400 was 3.870 bore. 1.75 CH. However, 40 over gets you 3.91 which is 318 mopar, if you can make that work.
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Clutch Guys Matter
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53 Studebaker, 400P/th400/9"
64 F-85
72 4-4-2 Mondello's VO Twister II
84 Hurst/Olds #2449
87 Cutlass Salon
54 Olds 88 sedan
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