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Old 03-14-2007, 01:41 PM   #1
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Default The Vortec 4.3 Project - Part #1 *Now With Pic'**

As a continuation to a continuation of http://www.bonnevilleclub.com/forum/...hlight=project , I am rebuilding the motor.

The crank was roasted. There was burnt oil in the oil outlets of the crank and mains. The bearings on cylinder 3 or 4 were as thin as a razor

For the rods, 3 were good, 3 were shot, so there are 6 on the way.

The FACTORY installed plugs were still in after 11 years and 132,725 miles I am guessing that maintance was not a "big deal" with this poor motor

The gears in the oil pump looked like they had been sandblasted

I need new lifters. The old ones fell out when pulling the crank

I should replace the cam drive gear and chain. There was some good play in the chain.

The block is being bored out 30 over, line homed, hot tanked and magna-fluxed. I pick that up tomorrow and hopefully start rebuilding the lower end tomorrow afternoon There was no physical damage to the block, thank God!, but it needed a good cleaning.

I know I need to post pics. I cannot get to photobucket from work, but will tackle that tonight wehn I get home.
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Old 03-14-2007, 10:51 PM   #2
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I also purchased a 96 blazer with a blown motor. Had some difficulty getting the right connecting rod set because the 4.3 was built in two different factory'* and there were different connecting rod weights depending on the crankshaft casting no'*. I found out that there was 13 grams weight difference when I compared them. You should be okay although if your replacement set are the same weight.

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Old 03-15-2007, 10:56 AM   #3
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Here are soem of the truck. Friday, I hope to have more to post:

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You can see where the piston was slapping the crap out of the head from that loose rod on cylinders 2 and 5
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This is the "anti-sieze" picture. It is a beautifully blended 50/50 mix of metal shavings and Penzoil

Take good care of your vehicle. You do not want to know what this rebuild is costing me

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