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09-10-2002, 12:16 AM
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#1 |
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what would Neal do?
Join Date: Sep 2002
Location: Winnipeg, Manitoba, Canada
Posts: 150
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'71 Pontiac GTO 400 in '68 GMC? or should I go SBC?
heh... well, that is the question that's driving me a little mental... My friend is selling the 400 out of his GTO and he gave me first dibs! it's got a 4 speed which I'm guessing is a Saginaw...
A little info if you're not familiar with the 400 Poncho: Once upon a time.......Chevy was different from Buick/Olds/Pontiac Back then Pontiac made their own 400. Visually, it looked the same as a Pontiac 350 or 455. It was essentially the same block with different bore and stroke. well, I know that the SBC is the way to go for making big power for cheap, but what about the Pontiac mill? Well, he'll give me the motor and tranny for 400 bucks... If were a chevy motor then I'd buy it for sure... lol, but it's not and I'm wondering what the benefits of the Pontiac would be over the 350... besides, GMC is sister companies with Pontiac... it's sorta the truck division while Pontiac is the car division of GMC... so that's sorta cool seeing how the truck would have been made the same time as the car... I know I'll have to make mounts but that doesn't scare me... I look forward to that... 
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1968 GMC 910 Long Step 250/3onTree 1969 Chevy C10 longfleet, 350/350 |
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09-10-2002, 12:21 AM
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#2 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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I say go for it...everyone has a small block. I just don't see why the h*ll they put the oil filter there...no way to keep the oil off your pipes when you remove it.
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09-10-2002, 02:53 AM
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#3 |
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poker face
Join Date: Jul 2002
Location: Saskatoon, Saskatchewan
Posts: 218
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If you are looking for torque, go for it. Pontiacs have longer rods and stroke, so there is a lot more low end torque. Don't try and rev it though. The crank doesn't agree with the rods after about 5500 rpm. A Pontiac 400 has BBC type torque, and only weighs 50lbs more than a SBC(with aluninum intake). As far as building for cheap, the pistons are the only thing that are more expensive. Check out www.classicalpontiac.com for engine building. You would be suprised at how those old engines perform.
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If you could kick the person in the *ss responsible for most of your trouble, you wouldn't sit for a month. Last edited by jiggs; 09-10-2002 at 02:58 AM. |
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09-10-2002, 08:48 AM
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#4 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,715
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As noted above, the Pontiac is a good choice. The trans SHOULD be a Muncie in the GTO, but after 30 years, who knows? Most Ponchos have cast rods rather than forged and the large bearing diameters make for high bearing speeds. Accurate machining and assembly, studded mains and ARP rod bolts will let the 400 live to 6500 rpm, but more than you want/need in your truck.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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09-11-2002, 01:21 AM
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#5 |
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Recovering Truck Driver
Join Date: Mar 2002
Location: Orleans, NE USA
Posts: 1,883
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I never thought I'd ever say it, but since I've been going to alot of car shows the last few years......I'm getting kinda tired of seeing sbc's.....don't get me wrong, I love a small block chevy, but they are in almost every custom rod you come across....I was actually happy to se an old mopar this weekend with a Hemi in it for a change, that was the biggest reason I decided to go with a Oldsmobile 350 in my 49 F*rd F-3 instead of a sbc.
I say go for it, like the commercial says, "different is good"
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska |
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