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Old 12-15-2008, 03:59 PM
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Is this a big problem ? please help

I have a 350 chevy with a edlebrock rpm kit but the block broke where the starter bolts so I got a used block out of a truck, The used not broken block didnt have a ring whatsoever and the guy told me it was having bottom end troubles so I pulled out the crank and switched it with the broken blocks crank, which I know the broken block's crank is good. and I pulled the rods out of the used not broken block, unfortunately my stepdad went on a cleaning rage and threw them all in a box completely disorganized after I had them set on which cylinder they came out of, Now I have no clue how they came out and we are really short on money right now, my plan was to reuse the rods and pistons and buy new rings and just slap it back together. My parts which I ordered ( rings and a total gasket set) will be here on wednesday. [U]How can I put the rods close to how they came without having it balanced by a machine shop ?[/U]

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Old 12-15-2008, 06:23 PM
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Quote:
Originally Posted by chevy350_Camd
I have a 350 chevy with a edlebrock rpm kit but the block broke where the starter bolts so I got a used block out of a truck, The used not broken block didnt have a ring whatsoever and the guy told me it was having bottom end troubles so I pulled out the crank and switched it with the broken blocks crank, which I know the broken block's crank is good. and I pulled the rods out of the used not broken block, unfortunately my stepdad went on a cleaning rage and threw them all in a box completely disorganized after I had them set on which cylinder they came out of, Now I have no clue how they came out and we are really short on money right now, my plan was to reuse the rods and pistons and buy new rings and just slap it back together. My parts which I ordered ( rings and a total gasket set) will be here on wednesday. [U]How can I put the rods close to how they came without having it balanced by a machine shop ?[/U]
As long as the rods/pistons are facing the right direction it wont matter. Since they're going into a different bore, new rings/bearings etc..
The rods aren't balanced to a certain journal on the crank, they're weight matched equally and the cranks counterweights are balanced to that weight.
You should check your bearing clearances very carefully & make sure you don't have any tight spots on the main journals if you're not having the block line honed. You should have the mains checked for straightness.
What kind of bottom end trouble did you find in the used block?
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Old 12-18-2008, 10:16 AM
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Problem

Not very much, that I could see. Im not to experianced in taking them apart to find the problem actually, but some of the main bearings, at the ends of one side were as sharp as a razor. It looked like they had been eaten on one side way more than the other resulting in a like knife blade on the ends. Thats all I noticed the crank looked find and the rods looked fine. He said he rebuilt it prior before I got it but like 10 years ago and it was a hard reving truck puller engine. Tell me if this is not enough Info.

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Old 12-18-2008, 12:00 PM
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On each connecting rod there is a stamped number both the rod and cap.
The numbers should match to the cylinder. Make sure the piston and connecting rod are facing the same direction. I may be wrong on this one, but there may be stamped arrow on the caps. It should be facing toward the front of the block.
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Old 12-18-2008, 12:12 PM
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Bent rods will wear the bearing more on one side than on the other as you have described. Check the big ends of the rods on the sides to see if they have been rubbing/chafing against each other or against the fillet on the crankpins.
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