03-16-2017, 05:21 PM | #1 |
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632 engine
Does anyone know anything about a 632 chevy engine
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03-16-2017, 05:59 PM | #2 |
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Re: 632 engine
Race only so don't put it in your grocery getter. Take $17,000.00 with you to get a nice one.
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03-16-2017, 06:59 PM | #3 |
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Re: 632 engine
My brother has found a old firetruck with a 632 in it. Low miles. I have never heard of one myself
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03-16-2017, 07:16 PM | #4 |
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Re: 632 engine
Probably a diesel.
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03-16-2017, 07:49 PM | #5 |
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Re: 632 engine
They are telling him it is a gas burner??
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03-16-2017, 08:50 PM | #6 |
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Re: 632 engine
Pics!!
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03-16-2017, 09:01 PM | #7 |
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Re: 632 engine
V-12 ? longhorn
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03-16-2017, 09:11 PM | #8 |
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Re: 632 engine
IIRC the V12 was a 702. Is it a V6? GMC made some big ones but not a 632. Assuming it's gas, of course.
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03-16-2017, 09:38 PM | #9 |
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Re: 632 engine
The guy selling the firetruck must not know what he is talking about. I have never heard of one and I dont think you guys have either. I will try to find out some more information from my brother. Thanks
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03-17-2017, 12:07 AM | #10 |
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Re: 632 engine
Could it be a GMC 637? That was a V8 offering in the 60's and 70's. What year is the truck?
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03-17-2017, 12:47 AM | #11 |
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Re: 632 engine
If it's a v8 it would be a GMC 637 which is ultra rare. Hard on gas, but tons of torque. If it is a 637 v8....GET IT....you will have a diamond in rough.
The only 632 chevy would be the bbc 632 you can get as a crate. Chevy never made anything that big for trucks. The largest v6 GMC made was a 478.
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03-17-2017, 09:09 AM | #12 |
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Re: 632 engine
Don't think any of the Detroits work out to that displacement, either.
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03-17-2017, 10:12 AM | #13 |
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Re: 632 engine
The 637 CI is a 1219 LB. boat anchor. Double the weight of most big block engines with a whopping 275 HP @ 2800 RPM and a 7.5-1 compression ratio. You could seal up your bed and weld a lid on it and use it for a fuel tank.
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03-17-2017, 10:41 AM | #14 |
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Re: 632 engine
Have you ever driven one?
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03-17-2017, 11:11 AM | #15 |
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Re: 632 engine
There is a posting in the Heavy Haulers section that details the 637 gas engine. Some interesting reading there. Seems the engine developed some 600lbs of torque with a 2b carb. Seems to have been used in very heavy duty trucks such as dumps and fire trucks.
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03-17-2017, 12:59 PM | #16 | |
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Re: 632 engine
Quote:
When I was a young whipper-snapper my old man had a 50's International 5ton flat bed monster. with a 549 gas motor and a 2bbl. That thing made the early Hemi's look small.
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03-17-2017, 01:07 PM | #17 | |
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Re: 632 engine
Quote:
The line of v6 engines that gm made were known to top 300,000 easily. I know of 3 that have over 500,000 so far. One that is at 650,000. The 637 was just as capable.
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03-17-2017, 01:21 PM | #18 |
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Re: 632 engine
I'll hold out some belief in the capability of the old engines until someone comes along to offer an opinion that has driven or worked on quite a few, rather than those that just see the horsepower numbers and that it's a 2 barrel and figure it can't possibly be driveable in this day and age, or those that judge a 454 1-ton on how a 305 shortbed performed towing their camaro.
From looking at the specs and construction of the old GMC V-6's and 8's, they were built for some serious duty and did it on oils that were probably more used up at 1,000 miles than today's oils are at 10,000. I constantly wonder, all the 50's, 60's, and 70's engines that commonly wore out not long after passing 100,000 miles - how would that rule of thumb have changed strictly by using the quality of lubricants we have today?
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03-17-2017, 01:33 PM | #19 | |
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Re: 632 engine
Quote:
Reliability and durability at their finest. The over rated 350 wouldn't take Half the abuse these v6's have through the years. People that comment bad on these engines are ignorant. When ran how they were made to run and taken care of they perform just fine. Yet people think they should run like a modern LS engine which is stupid.
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03-17-2017, 03:28 PM | #20 |
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03-17-2017, 03:30 PM | #21 |
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03-17-2017, 03:43 PM | #22 |
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Re: 632 engine
Wish you were closer, would love to have a 637!
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03-18-2017, 06:00 PM | #23 |
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Re: 632 engine
I'm fascinated by those old engines as well. The problem is that you have to know how to set one up and drive it. They need to be backed by a trans with many gears or a 2-speed rear splitter so you can keep the engine in the torque band. Those old engines with 2bbl carbs were designed like a diesel and cannot be revved. Which is foreign territory to those who are familiar with setting up a drivetrain for high performance use. These were truck engines. And they need to be used that way. 2000-3500 RPM all day long rowing gears, that's the sweet spot and that's why they lasted 600,000 miles. The 637 is a fascinating engine for a big truck. But putting it in anything else wouldn't be very practical. When it's running right, it will sound like a farm tractor at idle. It idles low!
If I recall, it shares some parts with the big v6 and ToroFlow diesel. In fact, there was a 637 ToroFlow offered, so make sure the one you are talking about is gas and not diesel.
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03-19-2017, 12:39 AM | #24 |
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Re: 632 engine
Idle for most was 450-500 rpm, many parts were shared between all v6's the v12 and v8. The 637 actually replaced the v12 in 1966.
With the amount of torque and the power band....the v8 would be really no different than having the v6 in a truck. It produced over 560 foot pounds at 1600 rpm.....a 3/4 ton with a 3.42 ratio and a 5 speed would benefit well from that much torque. Only thing would be Size as that v8 would make a big block look small. The sweet spot to run them was at 2000 rpm as many were governed. I believe the 478 was governed to 3200 in big rigs.
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