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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: jaysons on November 03, 2010, 04:04:50 pm
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So I'm i bit new here, but not to these trucks & engines.
I've got a Freshly rebuilt 355ci. to put in my 4x4. Bought the engine already bored out, & in pieces. Had the local machine shop do the heads & put the bottom end together. Just got the exterior pieces to put on & it's ready to go in. None of the boxes of parts that came with it had a harmonic balancer in it. I've got one all cleaned & painted, ready to go on; But the one I took off the 350ci. that I took out of the truck, has a much larger one on it.
The painted one is 6 & 3/4 inches in diameter. The one off the 350 is 8 inches in diameter. So my question is...... which one is required?
The engine is bored .060 over, Has a Lunati 350 hp cam, beefier valve springs, new piston & rings, new wrist pins, ...126 heads, Weiand intake, Edelbrock 600 carb, & as far as I know, stock crank & connecting rods.
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Ussually the trucks had the bigger 8".
check your timing chain cover for the location of the timing tab.
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In general... The smaller (lighter) the balancer, the higher rpm/performance, the application.
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For your 4x4 run the 8" balancer
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So what I'm gettin is that either one will work, right? The cam is supposed to help give it more bottom end torque, so the 8" would be better.
But if I was running it in sand drags or something similar, then I should run the smaller 6 3/4" one. Is that about right?
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Run the 8" balancer. Pounding on the engine other than mild stock applications you'll want the 8"
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i agree, run the 8 inch.
just because you can run the 6 3/4 doesn't necessarily you should.
I had a friend years ago that ran an aluminum flywheel because he could..... until he bent all his rods.
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Ok. Thanx for all the input guy's! The 8" is on it.
Next question..... got a brand new distributor with a rev limiter replacing the module in it. What is a good rpm to set it at, until I get the rings seated? And then Imma guessin I'll be able to set it according to what I feel the engine is comfortable with.