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Username Post: Big block gmc
Member #51
Posts 9095
01-02-21 09:48 AM - Post#2811194    

  • wagonman100 Said:
Yes, that is the casting number for the Olds 350. The Olds valve covers do not look like Chevy ones and may make you think it is a big block. A picture of the engine would help or do a search for pictures of the Olds engine and see if it looks like the one in the truck and report back.

Unless a person specifically knows the difference between a SB and BB Olds engine, it is nearly impossible to tell (unless you know your Olds casting numbers, or, what to look for).

Unlike Chevy SB and BB engines, Olds simply raised the block decks 1in. ALL, I mean, ALL Olds SB and BB valve covers, oil pans, brackets, accessories, exhaust manifolds, heads, pulleys, water pump, etc, etc, etc are a bolt on swap between SB and BB Olds engines.
OF COURSE, since Olds BB block decks are 1in taller, that means the BB intake manifolds are wider (and accessory belts are longer ------------------BUT THE BOLT PATTERNS ARE THE SAME AS SB MANIFOLDS.
In ultra simple terms, to replace a SB Olds (ie, 350) with a BB (ie, 455), you simply unbolt the exhaust manifolds from the heads, pull the 350, drop in the 455 and bolt the exhaust manifolds to the 455. NO, it's not exactly that simple ------------------------ but DAMN close.
The SB Olds are 260, 307, 330, 350, 403. The BB Olds are 400, 425, 455. And of course, internals are completely different. But on the outside, swapping a SB/BB Olds is TOOOOOOOOOOOOO EASY!

And yep, I've done it 2-3 times.
Oh ya, and Pontiac V8s are pretty much the same way.

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