Hi folks; i am doing a 455 rebuild, i was wondering if there is a stock crankshaft thta is bad or not good to use. this is basically a stock gs 455 rebuild? If this is the wrong area let me know
Thank you, my first Buick project, BBC and SBC had various cranks to choose from, wasnt sure about Buicks Thanks for your help, much appreciated
Probably even a bit more than that, too bad the factory block is only good to around 600 HP without a jockstrap.(girdle) The differences in cranks from a 400 to a 430 to a 455 is how they're balanced, other than that they are basically the same.
Given the different bore sizes the different pistons are going to have to weigh more.......so the balance would be slightly different. The 75/76 we not marked with an N but I've never been able to find out if they were made from a different metal or not
Just be sure to get it Mag checked as even a 350 hp motor will fail a cracked Crank in little time, and before that work gets done double check that all the bolt hole threads are good.
And make sure the main bearing tolerances are set to Buick specs not the run of the mill chevy specs. If the tolerances are set too loose the oil pressure will be really low and the motor will have a shorter lifespan. There's numerous threads on this topic on this forum.
All Buick 350 and big block cranks were cast from nodular iron. The reason the early cranks were marked with an "N" was the foundry Buick used cast both nodular and plain iron cranks. Later, Buick used a foundry that cast ONLY nodular iron cranks, thus no reason for an "N" on the crank.
I've heard that about Olds, too. I'm not saying I believe it. I don't think a non-nodular crank would survive. I don't think there are any non-nodular automotive crankshafts. They may be malleable iron; such as "Armasteel", or they may be ductile iron like most modern "nodular" castings. Either way, they're nodular--it's just that malleable iron becomes nodular with heat treatment while ductile iron becomes nodular due to chemical alloy.
