I'm want to use a 1967 430 crankshaft in a stock 1970 455. Will this work without rebalancing the rotating assembly ?
It will bolt in.....but can't say for sure if there is slight variation in counterweight due to different weight of 430 compared to 455 piston Buicks balance job wasn't great to begin with
Yes both engines came from auto trans cars. As for my Board name that project was sold unfinished, I'm working on a 1970 GS 350/auto car nonmatching numbers. It has a low compression factory replacement block with 1976 heads intake and carb. I'm new to the v8 Board so I'm trying to learn how to navigate. It seams a little complicated, I guess I must be getting old LOL! Anyway I have a few 455 goodies leftover from back in the day but the 430 is the only crank that I have.
...for which you will pay extra, because Buick used a non-industry-standard balance pad system on the connecting rods, and "custom" final balance by driving steel pins into the damper, or popping holes in the flexplate. A "real" engine balance job needs to correct Buick's cost-cutting. In the process, you'll wind up with a "standard-weight" damper and flexplate, and all the "correction" gets done on the crankshaft, where it belongs. I'm NOT a fan of Chinese connecting rods--they've killed a hundred-thousand of us and wounded our nation's economy, why reward them by sending 'em MORE money--but even I know that getting Buick rods to balance properly is far more difficult than with other brands. Aftermarket rods remove some of that headache. Mind you, the lower the maximum RPM you run the engine, the less difference the balance matters. This may or may not result in "internal balance", but at least the damper and flexplate aren't custom-matched to the individual engine they're installed on.
If you have any future intention to convert to manual transmission, now is the time to have your crankshaft machined for the appropriate bushing.
