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Old 03-16-2017, 05:21 PM   #1
65truckowner
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632 engine

Does anyone know anything about a 632 chevy engine
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Old 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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Old 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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Old 03-16-2017, 07:16 PM   #4
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Re: 632 engine

Probably a diesel.
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Old 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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Old 03-16-2017, 08:50 PM   #6
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Re: 632 engine

Pics!!
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Old 03-16-2017, 09:01 PM   #7
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Re: 632 engine

V-12 ? longhorn
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Old 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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Old 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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Old 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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Old 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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Old 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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Old 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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Old 03-17-2017, 10:41 AM   #14
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Re: 632 engine

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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.
Have you ever driven one?
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Old 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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Old 03-17-2017, 12:59 PM   #16
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Re: 632 engine

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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.
But that 275HP @ 2800 would be 515 pounds of torque @ 2800,, that's near Duramax territory! When diesel was 2x the cost of gas it might have been rational,, But with so little difference in fuels cost today,, A really cool collectors item for sure. but at probably about the same weight as a Duramax, but 1/4 the reliability or longivity... I think it would stay in the 'collectors corner' if it were mine.

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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Old 03-17-2017, 01:07 PM   #17
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Re: 632 engine

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Originally Posted by Marv D View Post
But that 275HP @ 2800 would be 515 pounds of torque @ 2800,, that's near Duramax territory! When diesel was 2x the cost of gas it might have been rational,, But with so little difference in fuels cost today,, A really cool collectors item for sure. but at probably about the same weight as a Duramax, but 1/4 the reliability or longivity... I think it would stay in the 'collectors corner' if it were mine.
.
Yet I haven't seen any duramax's around for 50 years that still run so.......

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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Old 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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Old 03-17-2017, 01:33 PM   #19
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Re: 632 engine

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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?
I've had 305 v6's apart, they are built like diesel engines. Heavy cranks and huge mains. Mains and main bearings are as big as a 7.3 diesel. Plus the early 305's were a 4 ring piston.
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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Old 03-17-2017, 03:28 PM   #20
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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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Old 03-17-2017, 03:30 PM   #21
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The engine has around 30000 miles my brother wants to buy the truck and sell the engine
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Old 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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Old 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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Old 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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