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-   -   400 sbc vs 400 pontiac (http://www.hotrodders.com/forum/400-sbc-vs-400-pontiac-105000.html)

Artemis Entreri 12-22-2006 10:40 AM

400 sbc vs 400 pontiac
 
So, ive been trying to find a 400 sbc to build this out of:
http://www.chevyhiperformance.com/te..._block_torque/

Now, im having a hard time finding one local and one guy I was shootin the **** with at a coffee shop suggested I just use a pontiac 400. I figured cubes are cubes, pontiac 400s seem alot easier to come by, why dont more people do it?

So my question is a few fold, are there major differences between pontiac and chevy 400s, or engines in general?

How do pontiac engines compare to chevy engines? (Or is it a taste thing?)

And I assume they are, but are the mounting brackets very different in a pontiac and chevy motor?

Oh, and does anyone know off hand the bore/stroke of a pontiac 400?

Thanks

killerformula 12-22-2006 10:49 AM

Quote:

2,300 rpm to 5,500 rpm where the engine showed off with 525 lb-ft of peak torque at 3,500 and 428 peak horsepower at 5,000 rpm. Impressive numbers like these made our dyno day go by pretty fast. The small-block beast delivered an incredible power curve that looked more like what a fat Rat would produce. At 2,300 rpm, the engine was already making 471 lb-ft of torque.
:eek:

K

firestone 12-22-2006 10:52 AM

I think a couple of reasons are that pontiac motors cost a lot more to build, and there is an unlimited aftermarket for chevy parts whereas you are somewhat limited with the pontiac stuff. Also, from what I have seen, cars sell faster for more money with chevy motors. Pontiac 400 is a 4.121 bore 3.75 stroke.

Adam

Artemis Entreri 12-22-2006 12:35 PM

Quote:

Originally Posted by killerformula
:eek:

K

Lol yea, its going to be fun, as long as my tranny and rear hold up. :sweat:

thanks firestone, I figured chevy would be cheaper and easier, just thought id ask, thanks again.

QuenchPiston 12-22-2006 01:39 PM

WESTSIDE PONTIAC 400 ENGINE
Corrected RPM Corrected Torque Horsepower
3,000 476 272
3,100 483 285.00
3,200 486 296.20
3,300 484 303.8
3,400 485 314.1
3,500 488 325.1
3,600 490 336.1
3,700 492 346.6
3,800 490.6 355
3,900 487.2 361.7
4,000 485.4 369.7
4,100 483.8 377.7
4,200 483.6 386.7
4,300 483.8 396.1
4,400 481.7 403.5
4,500 478.3 409.8
4,600 470.7 412.3
4,700 466.3 417.3
4,800 465.5 425.5
4,900 462.3 431.3
5,000 460.1 438.1
5,100 456 442.8
5,200 449.1 444.7
5,300 438.7 442.7
5,400 425.5 437.5
5,500 413 432.5
(Dec,2006. http://www.highperformancepontiac.co...formation.html)
672HP Pontiac 350
(Dec,2006. http://www.carcraft.com/techarticles..._pontiac_350s/)
I am sure anything in between can be built. As far as costs, that is all relative, HP/dollar, budget build, junk yard parts, strength/dollar, etc. Any part you can find for a sbchevy you can match it for a Pontiac engine. Is it a taste thing, absolutely and the strongest defenders of the sbchevy are ones who will not consider another brand on their plate. Oh yea, put a chevy engine in a original GTO and see if it fetches more $$$$$$ than one with the original GTO Pontiac engine in it. Cmon, listen to unbiased reasoning here.

runn141 12-22-2006 07:04 PM

Quote:

Originally Posted by Artemis Entreri
So, ive been trying to find a 400 sbc to build this out of:
http://www.chevyhiperformance.com/te..._block_torque/

Now, im having a hard time finding one local and one guy I was shootin the **** with at a coffee shop suggested I just use a pontiac 400. I figured cubes are cubes, pontiac 400s seem alot easier to come by, why dont more people do it?

So my question is a few fold, are there major differences between pontiac and chevy 400s, or engines in general?

How do pontiac engines compare to chevy engines? (Or is it a taste thing?)

And I assume they are, but are the mounting brackets very different in a pontiac and chevy motor?

Oh, and does anyone know off hand the bore/stroke of a pontiac 400?

Thanks

i dont know the bore and stroke of the pontiac but the chevy 400 is 4.125 and 3.750 stroke. i think the reason sbc 400 is hard to find is its runs better i know alot will read this and disagree, but ive seen this battle too many times.

Artemis Entreri 12-22-2006 07:11 PM

Heh, gunna stick with a chevy engine, ill wait till my dad breaks down and gives me the 65 goat, then i'll build a pontiac engine.

runn141 12-22-2006 07:13 PM

Quote:

Originally Posted by Artemis Entreri
Heh, gunna stick with a chevy engine, ill wait till my dad breaks down and gives me the 65 goat, then i'll build a pontiac engine.

what i have seen with pontiac the pontiac 350 will kill a pontiac 400, i think the pontiac 350 is also a big block. correct me if im wrong

QuenchPiston 12-22-2006 07:43 PM

Quote:

Originally Posted by runn141
i dont know the bore and stroke of the pontiac but the chevy 400 is 4.125 and 3.750 stroke. i think the reason sbc 400 is hard to find is its runs better i know alot will read this and disagree, but ive seen this battle too many times.

Ehhhhhhhhhhhh, the Pontiac 400 has the same bore and stroke as the 400 chevy. It has 3 inch mains that soak up 80hp from the overall flywheel horsepower figure, not!

QuenchPiston 12-22-2006 07:59 PM

Quote:

Originally Posted by runn141
what i have seen with pontiac the pontiac 350 will kill a pontiac 400, i think the pontiac 350 is also a big block. correct me if im wrong

I think I have been thru this once before. Seeing how the Pontiac 350 and 400 were separated by 20 HP according to some factory ratings I can see how "you" would argue that. Consider the 350 had a 3.88 bore vs. the 400's 4.12 bore both having the same stroke of 3.75. Which one do you think will have better breathing abilities? I plan on snatching up a 350 Pontiac this summer for a T build but... if I cant find one and a 400 thru 455 is available then I guess I will have to be satisfied with that.

QuenchPiston 12-22-2006 08:03 PM

Quote:

Originally Posted by runn141
what i have seen with pontiac the pontiac 350 will kill a pontiac 400, i think the pontiac 350 is also a big block. correct me if im wrong

Oh, I forgot, Pontiac did not make a small block nor small block, outside dimensions are the same from 326 on up to 455. If your into sleepers then slap that 326 sticker on the 455 and clean up the streets. You could consider Pontiacs as intermediate blocks if you want.

QuenchPiston 12-22-2006 08:13 PM

Quote:

Originally Posted by Artemis Entreri
Heh, gunna stick with a chevy engine, ill wait till my dad breaks down and gives me the 65 goat, then i'll build a pontiac engine.

Thats your right. While others who own/build Pontiacs enjoy Pontiac engines because of how well their built and how much fun they have in not owning another Cookie cutter engine.

runn141 12-22-2006 08:21 PM

Quote:

Originally Posted by QuenchPiston
Oh, I forgot, Pontiac did not make a small block nor small block, outside dimensions are the same from 326 on up to 455. If your into sleepers then slap that 326 sticker on the 455 and clean up the streets. You could consider Pontiacs as intermediate blocks if you want.

ill admit i dont know as much about pontiac as i do chevrolet. the 350 pontiac vs 400 pontiac i seen that one time only, im not gonna swear by it. i said bigblock because i knew 350 400 were interchangeable and i always
heard the pontiac called a big block


sorry

QuenchPiston 12-22-2006 08:41 PM

Quote:

Originally Posted by runn141
ill admit i dont know as much about pontiac as i do chevrolet. the 350 pontiac vs 400 pontiac i seen that one time only, im not gonna swear by it. i said bigblock because i knew 350 400 were interchangeable and i always
heard the pontiac called a big block


sorry

No reason to apologize, if my interest in transmissions was as great as it is in engines I would have drug the Golden Gate Bridge from its moorings across the country and placed it in my back yard. I have played with so many engines from Hirth and Sachs two strokes to V8 automotive engines, I just have fun with them and have an open mind. They are there for our enjoyment and imagination, not to pick only one and stick with it for the rest of our life. Could you imagine a world with only 7up to drink?

runn141 12-22-2006 08:46 PM

Quote:

Originally Posted by QuenchPiston
No reason to apologize, if my interest in transmissions was as great as it is in engines I would have drug the Golden Gate Bridge from its moorings across the country and placed it in my back yard. I have played with so many engines from Hirth and Sachs two strokes to V8 automotive engines, I just have fun with them and have an open mind. They are there for our enjoyment and imagination, not to pick only one and stick with it for the rest of our life. Could you imagine a world with only 7up to drink?

chevrolet has always been close to my heart same as the s10s, alot of people tell me im stupid about that, but i say fu<k em! :D
no one on this website though has said that


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