Quote:
Originally Posted by DLamb04
Is it true that Olds never did big or small block. And does that mean then that a 455 Rocket is the same block as my 307 (i think that's what it is). Im so confused cause i have a 85 Cutlass Salon, Vin Code Y, 5.0. I wanna medium build 350-400 horse. Not sure where to start. Do i rebuid and yank the computer, and emission strip it. Do i get a 403, I'm so confused on where to start. I heard Olds 350's, are good relible engines. But what's gonna be easier to get parts for. I don't have an endless pocket book but refuse to do anything less than right (I'm gonna show it, eventually). Thanks for any and all help.
I'll post photos soon
Donavan
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Olds DID have a big block and a small block, although the difference wasn't as drastic as big block Chevy vs. small block Chevy; basically, the only differences are a taller deck on the big block (about 1.3" or so) and bigger main journals on the big block (3.0" vs. 2.5"). Even the heads are swapable, although you'll lose compression by putting BBO heads on a SBO. The 403 is a good engine if you can find one with clean cylinder walls; you can't do anything to the block other than sleeve it because of the huge factory bore. The Olds 350 is a good, reliable engine; try to find one pre 1973. It's possible your Cutlass has a Chevy 305 (also a 5.0 litre); if the oil filler tube is front and centre on your engine block, it's the Olds 307. Also, Chevy distributors go through the intake manifold; Olds distributors do not. The big blocks will fit in there too, I think - the 425 is REALLY sturdy, but the 455 is easier to find. A decent running 455 out of a mid 70s wagon will sell for $300 to $400, although many have the performance challenged "J" heads. I'm kinda new to the world of Olds, so most members on this site will know a LOT better than me.
- GoldOlds