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Old 11-04-2012, 06:29 PM
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94 c1500 2 or 4 bolt

Hey guys gotta a question. has anyone ever had an engine out of a 94 c1500 that was a 4 bolt main. In my other post pre-tuner i think it was said his 91 c1500 (I think thats what year it was) had a 4 bolt main in it. Just curious. I thought all these had 2 bolt mains.

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Old 11-08-2012, 03:02 PM
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Originally Posted by allansmith859 View Post
Hey guys gotta a question. has anyone ever had an engine out of a 94 c1500 that was a 4 bolt main. In my other post pre-tuner i think it was said his 91 c1500 (I think thats what year it was) had a 4 bolt main in it. Just curious. I thought all these had 2 bolt mains.
You just never know till you open it up. Generally GM half ton trucks use the 2 bolt block with a cast crank. The 3/4 ton and up use the 4 bolt block with a forged crank. But it isn't uncommon to find the heavy duty engine in a half ton truck.

Bogie
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Old 11-08-2012, 07:20 PM
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If it is a 4 bolt main does that mean it has a forged crank??? If so how do you tell if its forged??? Is it mor beefy looking than stock???? Also I took a 350 out of a 95 truck. It was either a 3/4 ton or 1 ton but it was a 2 bolt main. It was original engine. Anyway could that have had a forged crank??? Or does GM like to mis match engines/parts like that
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Old 11-09-2012, 10:47 AM
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Originally Posted by allansmith859 View Post
If it is a 4 bolt main does that mean it has a forged crank??? If so how do you tell if its forged??? Is it mor beefy looking than stock???? Also I took a 350 out of a 95 truck. It was either a 3/4 ton or 1 ton but it was a 2 bolt main. It was original engine. Anyway could that have had a forged crank??? Or does GM like to mis match engines/parts like that
Forged crank has a very wide pating line that runs along the centerline of the crank where the dies came together, a cast crank will have a very thin parting line.

Bogie
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Old 11-09-2012, 11:36 AM
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good luck finding a forged crank in anything under a one ton..
just not needed with 240hp and a automatic..
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Old 11-09-2012, 01:16 PM
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Originally Posted by E.Furgal View Post
good luck finding a forged crank in anything under a one ton..
just not needed with 240hp and a automatic..
Yeah but if GM is anything it's inconsistent.

Bogie
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