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Old 06-22-2009, 06:31 PM   #11
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Re: GM Engines

I repeat: the Cadillac 472 and 500 V8 are tortally unsuited for this type of use.

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The 500 Caddy has an obscure little brother, the 472.
472's are more common...they ran in all 1968-69 Cads (RWD and Eldos) and in 1970-74 RWD cars. 500's ran 1970-74 Eldorados and all 1975-76 Cads except Sevilles. 1970-up 472's used the same blocks as the 500's. The big change was in about 1972: the switch to open-chamber heads.

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I have seen a late 70s-early 80s Fleetwood with a 425 in it, but it may have been the Olds motor
1977-79 Cads (de Ville, Fleetwood, Service Chassis, Eldo) had Cad 425's, the only Olds was the diesel. The 368 (V-8-6-4) was externally very similar to the 425, showed up in, IIRC, 1980. Later Cads had the Olds 307.

The Buick 430 ran alongside the 400 back to 1968 or earlier...it got less notice since it was never installed in anything smaller than a land barge. The 455 replaced it in 1970, also alongside the 400. The Buick 455 ran to about 1976, the 350 a couple years later. The 455 is a stroked 430...same block. A 430 block with a 455 crank & rods is a 455 and vice versa.

None are especially well suited for powerring school bus.
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Old 06-22-2009, 06:50 PM   #12
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Re: GM Engines

I bet you could find a great deal on a GM 350 diesel.... jk
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Old 06-22-2009, 07:04 PM   #13
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Re: GM Engines

The only thing wrong with that is G.M. never made a great Diesel. Unless your talk'in about two stroke oil sling'n Detroit's Russell
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Old 06-23-2009, 07:34 AM   #14
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Re: GM Engines

I would say that GM/Detroit has made the best diesel engine and the absolute worst as well, think I would lump the 6.2 in the latter. Anyways, I'd be more inclined to go with a motor that is more common today and take the EFI with it, like a 366, 454 or 502. Personally I think stuffing a 6v71 and 9sp in one would be more fun.
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Old 06-23-2009, 08:20 AM   #15
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Re: GM Engines

I only have a little room 8 may be pushing it. Actually a later model 6v92 may be better but I have a potential donor (6v71) but will save that project for next year.
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Old 08-15-2009, 03:18 PM   #16
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Re: GM Engines

well as far as a 454 chevy i'm not that impressed with it it's under powered even though it has a cam
and that is why i'm thinking of the cad motor for it's torque and cubes and the 500 is a stroked 472
and i have the hot rod mag of the bad seed that was a good article.

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Old 08-15-2009, 06:27 PM   #17
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Re: GM Engines

Which 454 do you have? The heads on the industrial 454's were terrible. They're a lot like TBI heads for the small blocks in that they really do a great job of making torque until you wind them to even just 3000 RPM's where they just can't breathe enough anymore.
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Old 08-16-2009, 10:05 AM   #18
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Re: GM Engines

it's the restricted flow in the heads that lets them make great torque at low speed, It's the price you have to pay to make power just off idle.
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Old 08-17-2009, 10:06 PM   #19
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Re: GM Engines

it's not the stock motor date code on the air cleaner seid 1976 454 and
it is from a 1/2-1 ton the bus came with the v6 and it's not stock in side
the motor don't know what all they did to it or put on it i have not had
it open when i do the valve covers i can get the casting numbers for
the heads.
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