Guest 400 ci 280z Posted December 3, 2001 Share Posted December 3, 2001 i have a pontiac 400 ci engine out of a 77 trans am. could someone tell me if that is a small block or a big block. also does anyone know about how much power the stock engine would make. thanks for any help. Quote Link to comment Share on other sites More sharing options...
staledale Posted December 3, 2001 Share Posted December 3, 2001 Pont v-8s were all the same size, little bigger than a chevy sb a little smaller than the bb. Weight wise same thing. It's basicaly a tweener. think a 77 is about 225hp. but great bottom end. Will respond to some simple mods and make good HP while still being streetable. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted December 3, 2001 Share Posted December 3, 2001 I understand that the 400 engine is just like any other GM small block, with larger bore and stroke. I do know that the 400 crank in a 350 block makes a 383 stroker engine, which is more desirable because there is more room between the cylinder wall and the water jackets.. I hear the 400 engine had overheating problems, if you're considering using that engine, get a nice beefy cooling system -Steve Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted December 3, 2001 Share Posted December 3, 2001 stev240z i think your talking about the chevy 400 block not the pontiac. my GF has a 77 firebird formula with a 400 in it. a very good motor IMHO. i have found a few websites that tell about diferent combos and give the dyno results. just look up pontiac 400 in a google search. i'm sure you'll find it. apperently all you need is a good porting job on the #604? casting heads and a nice cam and intake and you are looking at 400+ with a nice torque curve behind it. you can find a pretty good amount of spreed parts for it on ebay too. good luck to ya man. i wan't to see some pictures when you get it in the car should be a sweet ride Quote Link to comment Share on other sites More sharing options...
Guest 400 ci 280z Posted December 3, 2001 Share Posted December 3, 2001 thanks guys for your help. my uncle said it was out of his 77 pontiac trans am so i figured it was a pontiac engine. Quote Link to comment Share on other sites More sharing options...
Guest 400 ci 280z Posted December 3, 2001 Share Posted December 3, 2001 never mind i didnt read the first few words in your first sentence. Quote Link to comment Share on other sites More sharing options...
Guest grinsha Posted December 3, 2001 Share Posted December 3, 2001 If it is a Pontiac 400 a good place to get info is www.classicalpontiac.com. Quote Link to comment Share on other sites More sharing options...
staledale Posted December 3, 2001 Share Posted December 3, 2001 Make sure it's Pont 400, that's about the time they started putting Olds 403 in the T/A Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted March 10, 2002 Share Posted March 10, 2002 I have to agree with Grinsha. Classical Pontiac is THE site for information on Pontiacs. The Q&A for spwcific questions and the restoration for ID codes for engines, heads, etc. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted March 11, 2002 Share Posted March 11, 2002 Pontiac stopped using the 400's in '79 when they ran out. They had ceased production and went with 403 after that. BTW 403 are easily identifiable. Along the drivers side of the block is a rather large casting "403". For other Pontiac engine ID's many are cast on the side of the block under the crud. The 2-digit Block codes are usually found on the front of the block just below the passenger side head where it meets the block. Head codes are usually 2 digit (4X, 6X, 6H, 96, etc) on the center port. Heads like 670, 716, etc are usually the last 3 digits of a string of digits just below the valve covers. There are exceptions to all of this and info can be found at several internet pages such as those already mentioned. Quote Link to comment Share on other sites More sharing options...
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