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Originally Posted by joe_padavano
........ 403 is 170 lbs and the 455 is 200 lbs ........
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Assuming A/C on the 403, we are looking at a 36 lb difference between it, and the A/C '70 455. Close enough to your 30.
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........ I'm guessing that the 307 is a little lighter still ........
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Common knowledge.
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........ Factor in the lighter crank, shorter rods, and smaller pistons ........
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And lighter heads. About twenty pounds lighter, for a total of 56? Lets call it 60 lb. Still a heluvalot closer to 20 than 150, which was my point.
It doesn't, however, excuse my failure to catch the A/C error.
Norm