The 428 is very similar to the olds 425 on bore and stroke. 425 was made 1965-1967, with factory forged crank and 7.0" forged rods. Same argument, some say its better than the 455 which came later. Whether pontiac or olds, or whatever, its a good bore/stroke combo!
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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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