| [GMCnet] GM engine commonality [message #79677] |
Thu, 08 April 2010 06:15 |
Gary Casey
Messages: 448
Registered: September 2009
Karma: 0
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Senior Member |
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The discussion has drifted a bit off topic, so I took the liberty of changing topic.
I might have some of this wrong, but here is what I remember:
1. The Riviera (RWD) was a completely different car than the Toronado/Eldorado (FWD) for the first several years, and they both were different than all other cars. the Riv had a frame/body construction and the Toro had a unit body with a front subframe. The Toro and Eldo were the "same."
2. The Riv outsold the Toro/Eldo by more than 2:1, much to the consternation of Oldsmobile management. I doubt they ever made any money on the Toro
3. There were only two bellhousing bolt patterns at GM - one used by Chevrolet and one used by Pontiac/Buick/Oldsmobile/Cadillac. Actually, the dowel pin locations and the bottom (I think it was the bottom) two bolt holes were the same, but the others were different. Longitudinally, the flanges were in the same place.
4. There are many interchangeable internal parts between the RWD Hydramatic THM-400 and the FWD THM-425. About the only differences are the front pump and the helix angle of the gearset - the THM-425 rotated "backwards." The valve bodies are also different.
So, any non-Chevrolet engine will bolt on to the transmission - have at it.
Gary
Date: Wed, 7 Apr 2010 22:17:52 -0400
From: Ken Henderson <ken0henderson@gmail.com>
Subject: Re: [GMCnet] 2/4 bagger
To: gmclist@temp.gmcnet.org
Message-ID:
<r2w5002bc71004071917q415ccb86wcaad3ee87a2f2669@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Buick, Olds, and Pontiac all had 455 ci engines back them. ALL of them
completely different designs. For example, the only basic engine part I've
heard to be interchangeable between the Olds and Pontiac is the valve
lifters. (Aside from some "generic" items like distributor caps, rotors,
ignition modules, spark plugs, etc.)
Ken H.
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