1994 C3500 350 Spun rod bearing

[tanman_2006]

Well a 1500 gallon fertilizer tank will weigh 15k plus trailer weight and all it's tools and diesel tank for my tractor.

I'm pulling it with a half ton now, I want the one ton back! Haha

 

[Manimal]

I was told a 1500 had 2 bolt main and higher compression

This is not true. A 2 bolt main will work like any other. Having worked in machine shops building engines of all sorts, I have seen more 4 bolt blocks broken then I have 2 bolts(theres 2 more holes drilled in each main saddle), not saying the 4 bolts are not good, but there is nothing wrong with a 2 bolt block. And I have never seen a difference between a 1/2t engine and a 1t engine as far as compression goes. The major differences in them were the heads. "SOME" HD engines had smaller intake valves and sodium filled exhaust valves.
So if you find a 5.7 in good running condition, dont be too worried about the main bolt thing.

 

[Supercharged111]

This is not true. A 2 bolt main will work like any other. Having worked in machine shops building engines of all sorts, I have seen more 4 bolt blocks broken then I have 2 bolts(theres 2 more holes drilled in each main saddle), not saying the 4 bolts are not good, but there is nothing wrong with a 2 bolt block. And I have never seen a difference between a 1/2t engine and a 1t engine as far as compression goes. The major differences in them were the heads. "SOME" HD engines had smaller intake valves and sodium filled exhaust valves.
So if you find a 5.7 in good running condition, dont be too worried about the main bolt thing.

4 bolts blocks came in 8600+ GVW trucks. HD trucks get beat on per capita more than light duty so it's not weird to me that you see more of them. The 4 bolt blocks have around 8.5:1 compression and the 2 bolt was closer to 9.5. This is only in reference to the TBI engines.

 

[Manimal]

I would like to see where GM produced a 9.5:1 compression truck engine..small block, not vortec.

 

[Supercharged111]

Here ya go, 9.25:1.

https://paceperformance.com/i-64850...mc-full-size-trucks-g-van-up-to-7200-gvw.html

 

[Manimal]

that is NOT the same engine that the factory put into trucks. Thats a crate motor, look at the GM data for the factory engines that were put into the trucks. Thats a replacement...sorry

 

[Supercharged111]

Then prove me wrong.

 

[Manimal]

OK, youre right about the compression, but the short blocks are EXACTLY identical....except for the number of main bolts. If you have heads with a casting # 191, you will have 76cc and yield a 8.5:1 and if you have heads with a casting # 193 you will have 64cc and will yield 9.25.

 

[Supercharged111]

Yup, and I agree 2 bolt vs 4 bolt is insignificant.

 

[tanman_2006]

Got a 110k mile engine out of the '94 2 door Tahoe for $500.

I plan to do the oil pan, rear main seal, and intake gasket while it's out. I will also do the tbi mods (no cruise on my truck so that will be easy).

Now that there was a significant amount of $ saved vs a rebuild a cam swap is tempting