Hi,
A friend has a '67 GM 4301. I have not seen it. The engine is blown. It has a 4-78 diesel in it.
I was wondering if someone knew if something larger, like a 6-71 or 6V-71 would fit? If he's got to have a new motor anyway it would be nice if it wasn't under powered.
Thanks
Jerry
Very confusing post. As far as I know there never was a GM 4301. There was a 5301 but the last one was built in '62. The engines used in '67 were either 6V-71 or 8V-71. I don't think the 4-71 was used after about 1952.
There was a 4103 built in the late '40s or early '50s as I remember, don't hold me to it, but I thought they had 671 engines?
Never heard of a 4301?
GM made a 478 cu in V-6 that was converted from the 477 cu in V-6 gas engine (what is it with GM converting gas engines to Diesels-like the Olds engines?). It was called a Toro-Flo engine and (being polite here) was a piece of junk. About 170hp and 440lb/ft of torque. Don't ever heat it up. It had a very over square bore of 5.125" and a short stroke of 3.86"-so low end torque wasn't good-but seemed to be alright above 1500rpm (they would rev to over 3000rpm). These Toro-Flo engines were in a V drive, but the engine faced the right side with the radiator on the right, running through a turbo-hydromatic transmission with a 90 degree drive on the end and an offset drive axle differential. Not suggested for a bus conversion.
These were typically in a 30ft bus. The only real conversion would be a pickup size engine in a T drive configuration. Wouldn't be worth converting to a 6-71. Good Luck, TomC
TomC,
I do not understand your comment of "oversquare" bore of 5.125 ? Is regarding the relationship of the large bore & relatively short stroke ?
Thanks.
Sounds like a 3501 or 3502. GM kept building short (30-foot is right) old-looks, well into the Fishbowl age. The diesels were, indeed, Toro-flows. Gas was an option. All that I remember had hydraulic transmissions. That's if it's an old-look.
If it is a Fishbowl, it is probably a 3301 or 3302 (amazing, that with each new generation of transit buses we lost seats in the same length of coach). They, too had a Toro-Flow (II), and were also available with a GM 351 gasoline engine (per Bill Luke's book, City Transit buses of the 20th Century).
Please try to get a serial number from the builders plate - if your friend has access.
Arthur
You are right TomC, it is a V-6 478 CI.
The owner told me it has these #'s somewhere.
Series #1049
TDH 3501
I went to see it yesterday. I don't think it is suitable for an engine swap. I think it is only 27 ft long. As far as I'm concerned it would have to be a lot of love and deep pockets. It is a cute little baby bus.
Thanks for the info
Jerry
Gary- over square bore refers to an engine with a larger bore then stroke-like the Toro-flow. Square is identical bore and stroke. Under square is where the bore is smaller then the stroke-like what most Diesels are made to get the maximum torque-like the Detroit 71 series with 4.25" bore x 5.00" stroke. Good luck, TomC