How much stronger is a 430 than a 455? Was looking at the AM&P EMC engine and started thinking. A 4.250 stroke, 6.800 rod 430 stroker (.038 bore) yeilds 476.788 cubic inches. A 455 of the with the same mods yeilds 505.414 cubic inches. It is about 30 cubic inch differance. But, for longevity would a 430 block last longer? If all remains the same is the 430 a stronger combo (beit less power)??? Michael
The castings are so similar there's no reason to run the 430, in my opinion. Differences in piston weight, but not significant enough to throw away 30 cubic inches. Devon
You can Thank are Buddy (Dennis Manner) for carving on the Block taking all meat away from the Cylinder walls and Mains. Making the Crank the Back Bone of the Motor. He should have left meat in the Block and made the crank Smaller. We Buick guys got Ripped off in the Block world. Look at the Rest of the GM Blocks from 1967-1976
i do like the thickness of the main saddles on them others, and the fact that they have alot of metal in between the lifter bores in the lifter valley.
I was still going to fill and girdle the 430, but if apples are apples and there is nothing to gain Ill stick with the 455 block. Michael
