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Author Topic: big block 350 ??  (Read 3176 times)
dab67
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« on: June 23, 2006, 06:35:44 AM »

Anyone ever hear this term for a 350 or ever seen one? I've been told that in the 60's this was an engine put into Impalas. If so, what was the difference from the SB 350?

dab67
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JohnZ
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« Reply #1 on: June 23, 2006, 10:09:45 AM »

No such thing as a "big-block" 350. Gen I small-blocks got as large as 400 cu. in., and the smallest Mark IV big-block was a 366 tall-deck block, used only in HD trucks (and useless as a performance engine).
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« Reply #2 on: June 23, 2006, 10:12:07 AM »

Dab,

I've always thought that "big block 350" was a misnomer for the Pontiac motors.  Apparently, GM's Pontiac motors were configured differently from Chevy and Buick.  I've also heard the Pontiac motor referred to as a so-called "medium block".
I used to have a 61 Impala SS.  Some of the 60s Impalas did have a 348 motor with 350hp.  Maybe that's part of the confusion.
Someone else would have to tell you if GM crossed over any Pontiac 350s to Impalas in the 60s.  I do not know.

Phillip
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Phillip
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dab67
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« Reply #3 on: June 26, 2006, 05:59:00 AM »

Ok since this is the case regarding "no big block" 350, is it possible to match up the rear end of the 350 sb with the bellhousing and flexplate from a Pontiac 400 and then install a powerglide to that?  I'm fishing here as you can tell!!!!!!!!!!!!!!!!!!!! Was the Pontiac 400 flexplate larger than the 350 flexplate? Or am I really losing it!!!!! Ha!

dab67
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dab67
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« Reply #4 on: June 26, 2006, 06:16:41 AM »

Or, can someone tell me the physcial difference between the Chevy power glide and the Pontiac power glide? And can you hook up a Pontiac powerglide to a sb chevy? Huh
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CNorton
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« Reply #5 on: June 26, 2006, 06:58:31 AM »

The primary issue with Chevy/Pontiac Powerglides is the difference in bellhousing bolt patterns.  They are significantly different and will not interchange without an adaptor and I seriously doubt that it would be worth the difference to tackle that project.  Having said that, be aware that dual-pattern bellhousings do exist for some GM transmissions.  If you are determined to use a Pontiac transmission behind your Chevy block it would be necessary to determine that a dual-pattern case was ever made for the 'Gllide, then locate one and swap the internals between the two.  Sounds like waaay too much drama to make it worthwhile.
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dab67
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« Reply #6 on: June 26, 2006, 11:49:13 AM »

I do not want to use a Pontiac tranny with my 350. All I want to do is find a dust cover to protect my flexplate and I can't find one!!!!!!!!!!!!  I know I have a Chevy power glide with a small starter, and I know I have a 350 Chevy block. I just don't know what flexplate I have because i can't fine a cover to fit it. Do I sound frustrated?HuhHuh?? you bet!!!!!!!!!!!!!!!!! Thanks for the input CNroton.  i will have the bellhousing checked to see if someone did flip flop parts. I am hoping no they did not. 
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