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Old June 1st, 2014, 06:12 PM   #1
Carbon
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Default Sbc 350 difference?

Pulled a tbi 350 out of my brother in-laws 97 k1500 today because he had very low compression and we are swapping in another tbi 350 with lower millage. He has a manual transmission in the truck so I pulled the flex plate off the spare and pulled his fly wheel off his old engine to swap them over. This is what I found.





His fly wheel does not bolt up the the other crank. Any help or ideas please let me know.
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Old June 1st, 2014, 06:44 PM   #2
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Looks to me like one is a two piece rear main and one is a one piece rear main, the cranks are different. The other problem you will have is the 97 had the cpi fuel injection that used a crank sensor. The 95 and prior tbi blocks were different. The timing cover for the vortec will bolt on all but 2 bolts, but will NOT seal for oil leaks, the cover doesn't meet the block on the sides. Mine would seal at idle but as soon as you get on it the oil would pour out.
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Old June 1st, 2014, 07:07 PM   #3
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The engine that came out of the truck was supposedly out of an older camaro. I need to find out how to run the numbers on the blocks.
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Old June 1st, 2014, 08:34 PM   #4
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the tbi motor is also external balance as where the vortec is internal balance so the flywheel would have to be for the tbi motor.

most likely wont be able to do the swap because of the crank sensor deal.
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Old June 1st, 2014, 08:40 PM   #5
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I don't think either one of these are vortec..
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Old June 1st, 2014, 09:02 PM   #6
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I would run the engine block code and go from there.
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Old June 1st, 2014, 09:09 PM   #7
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I will run the numbers tomorrow. Was just trying to save him some time and money since I had the engine laying in the garage from a project that I am not moving forward with. We have another engine in his other 97 k1500 he wrecked last year that will drop right in, same trans and tcase. I have swapped several sbc 350s and never ran into this 1 piece/2 piece deal. Learn new things everyday.

Thanks for the help guys.
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Old June 1st, 2014, 09:38 PM   #8
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Quote:
Originally Posted by Carbon View Post
I don't think either one of these are vortec..
If its a stock 97 truck then the engine will be a vortec
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Old June 2nd, 2014, 10:23 AM   #9
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The engine we are pulling out of the other 97 is not stock either. That one was swapped a couple of years ago. I do not remember what we got it from. I will have to do some looking.

He is not good at keeping engines or transmissions alive in trucks for long. If its not the fact that he blows something up he usually crashes the truck.
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Old June 3rd, 2014, 09:18 PM   #10
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The top block is the older 2-piece rear seal block, I cannot see the casting number but I see the annotation that it is a block with extra tin and nickel - most likley a 1979 or earlier block. You could confirm that by looking at the dip stick, if it is on the left side (driver side) then it is a 1979 or earlier, if it is on the right side (passanger side) it is a 1980-1985 block. As a 350 that one would be internally balanced.

The second block is a 1986 -1999 1-piece rear seal - they were all externally balanced and have their own flex plate that worked with the 305 and 350. To put the second block in the truck with a manual transmission you will need to get the 1986 and later flywheel, the one that came off the first engine will not work.
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Old June 4th, 2014, 08:13 AM   #11
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Thank you for the information Iggy. Yes the dip stick is on the left side. We ended up putting a different engine in the truck so these ones will either sit in the garage or be put up for sale.
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