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Old 05-19-2009, 06:57 PM
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scat vs pro comp rods in a chevy 383

Hi, i need your opinion on this one
I just got my hands over a Chevy 383 rotation kit, external balanced Eagle 5140 crank, flex plate + damper. Sealed power flat top pistons, this kit also came with Pro Comp 5,7 rods,, the documents from the seller says its balanced. but i have heard so many bad things about those pro comp rods, and that has made me not wanting to use them ,but i have a set of new scat rods but they are 10 gr. heavier. Will that take the motor out of balance or is that OK to do ? This engine will go in my brothers daily driven 76 corvette and see max rpm of 5500.
Thanks and best regards. Kristofer.

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Old 05-19-2009, 07:29 PM
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rods

Where is the 10 grams, big end or small end???

I personally would never use a pro-comp rod in anything. I would pay the extra to re-balance before using the pro-comps.

Keith
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Old 05-20-2009, 09:28 AM
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hi and thanks for your reply, when i weight those rods it seems to me that 7 of those 10 gr. are at the big end.
I sure would have the kit re balanced but here in Iceland it is not possible because no one has the equipment to do that, sucks !
I would prefer the scat rods if they wont take the engine out of balance ?
Thanks again. Kristofer.
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Old 05-20-2009, 10:11 AM
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Pro Comp

I agree.I dont like the pro comp rods either.Since you cant get it rebalanced you might try calling eagle and see if they could help out with a set weight matched to your specs.Extra money but well spent when you think of a blown engine.Greg
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Old 05-20-2009, 12:04 PM
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I have never seen a Pro Comp rod and have no desire to ever look at one. Scat makes some nice rods and I will blindly say there is no comparison. Scat rods are used in so many performance applications and have been for so many years it does not make sense to save a dollar on some cheapo rods. I am not sure how long it's been since the introduction of the Pro Comp brand but it has been some time, and there is not a lot of rave about anything but the price, which is really not a savings at all. To me using this kind of stuff will result in nothing long lived or good. I have yet to see anybody at a dragstrip bragging about their Pro Comp anything! Any roundy round guys out there use em that reading this? I'd guess their engine guy would not use such an item unless made to do so. Even if the price is really cheap, how will the machining and accuracy of the rod stack up to a quality one? I suppose for a slap together don't care if it lives not too tuff of an engine, they might be okay - IF they all checked out and good. But why have to go thru all of that?
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Old 05-20-2009, 12:33 PM
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OK. as i understand you guys, those 10 extra grams are to much.
So i am going to give eagle a call and see what they can do for me.
Thanks for your help. Kristofer.
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Old 05-20-2009, 02:33 PM
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Kristopher

If you have a gram scale, you may be able to make up a setup for balancing the rods yourself, or at least to match them to the pro-comps.

Now, let me make this clear I AM NOT AN AUTOMOTIVE MACHINIST, but I feel comfortable I could do this in my garage. On the other hand, I am not certain about the best place to remove the weight (other than the balance pads) and I am not certain that the pads can shed 7 and 3 grams. But, I'd be willing to give it a try. Small gram scales can be had for less money than a set of good rods, and I think you said you had the Scat rods already.

Good Luck,

Pat
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Old 05-20-2009, 03:14 PM
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Quote:
Originally Posted by PatM
Kristopher

If you have a gram scale, you may be able to make up a setup for balancing the rods yourself, or at least to match them to the pro-comps.

Now, let me make this clear I AM NOT AN AUTOMOTIVE MACHINIST, but I feel comfortable I could do this in my garage. On the other hand, I am not certain about the best place to remove the weight (other than the balance pads) and I am not certain that the pads can shed 7 and 3 grams. But, I'd be willing to give it a try. Small gram scales can be had for less money than a set of good rods, and I think you said you had the Scat rods already.

Good Luck,

Pat

I agree, you could do this yourself. Take a look at this article and give it a whirl.

http://www.angelfire.com/ca4/CorvAIR...dBalance2.html
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Old 03-30-2010, 04:42 AM
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Pro Comp parts

Hi,
I have just recentley waisted money buying a stroker kit for my 350 through Procomp.
The kits are of poor quality and once i did some reserach, I heard some bad stories about them.
The problem I found was that one of the rods was hitiing on the Cam, most of the bolts had to have a angle on them to stop them hitting the block and also the sump.
Now for the crank, this couldn't be balanced as it would look like an old bit of chedder cheese and have stories that guys have stripped flex plate bolts too. ABSOLUTE RUBBISH.....
The quick stoker kit ended up costing about $7000 by the time I wasited all money on the ProComp rubbish and finally buying some Scat parts..

---- Note to self, don't ever buy PROCOMP parts for any of our cars again---

Jimbo
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Old 03-30-2010, 10:43 AM
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Glad I ended up using the ones from Scat, no problems so far....
But I am truly sorry to hear you had so bad experience.
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Old 03-30-2010, 11:03 AM
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I tried saving too, but by piecing a kit together with quality parts.

Stock 5.7" GM rods - $20
ARP 383 rod bolts - $65
Speed Pro pistons - $230
Hasting cat piston rings - $15
Eagle 3.75" stroke crankshaft (internal balance) - $231
Damper and flexplate kit - $125
Clevite 77 high performance narrowed bearings (mains and rods) - $100+
Balancing - $250
Install and rod resizing - $80

Total=$821


It still ended up being about the same price as a kit and having it balanced.
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Old 03-30-2010, 11:05 AM
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Quote:
Originally Posted by Icelander
Glad I ended up using the ones from Scat, no problems so far....
But I am truly sorry to hear you had so bad experience.
Thank you very much for coming back with an update.
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Old 03-30-2010, 02:23 PM
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Icelander -- Did you balance them yourself? How'd that work out for you?

PatM
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Old 03-30-2010, 02:39 PM
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I would never trust a connecting rod made of chinesium.

When ever you change the weight of a rotating component, the crank needs to be rebalanced.
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Old 03-30-2010, 02:46 PM
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Well I shaved those few grams off, assembled the engine and so far two thumbs up.

This ain't no race motor but makes a decent street driver, cant feel any vibration, guess I will need to look at the bearings to tell.
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