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ARP rod bolts & resizing the rods.

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Old 06-19-2012, 08:39 PM   #1
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Default ARP rod bolts & resizing the rods.

I ordered some ARP rod bolts & I thought I could just use them in place of the stock ones & resizing wasn't necessary because the LS uses "cracked type rods" Does anyone know for sure if it's necessary? To be honest, I'm not even sure what resizing is, or what it takes to do it.
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Old 06-20-2012, 03:24 AM   #2
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To resize a cracked cap rod, you hone the big end over .002 and use a special bearing. The bearing part number is clevite 1776p IIRC. I checked my 2008 LY6 rods after installing the bolts and they were a little out of round, so we had them resized. At the very least I would install the bolts and have a machine shop check the big end. Hope this helps, Eric L
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Old 06-20-2012, 04:23 AM   #3
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thanks Eric, very helpful!!!
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Old 06-20-2012, 12:24 PM   #4
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i have to do this as well..
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Old 06-20-2012, 12:31 PM   #5
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Depends who you ask, some say the 8740 arp replacement is direct drop in, others say measure, and some say resize. Personally i just installed them and the motor has seen multiple track passes shifting at 7200rpm all day.
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Old 06-20-2012, 02:50 PM   #6
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Some work out, others don't. Katech swears theirs are for direct swap, arp does not.
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Old 06-20-2012, 04:13 PM   #7
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Vengeance and Thunder Racing say straight swap on the 8740's. But like I posted earlier.......... Just another opinion.
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Old 06-20-2012, 04:22 PM   #8
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how much does it cost to resize them?
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Old 06-20-2012, 08:54 PM   #9
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Do you always rebalance the rotating assembly after adding aftermarket rod bolts?
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Old 06-20-2012, 10:30 PM   #10
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Quote:
Originally Posted by 06X6spdGTO View Post
Depends who you ask, some say the 8740 arp replacement is direct drop in, others say measure, and some say resize. Personally i just installed them and the motor has seen multiple track passes shifting at 7200rpm all day.
i cant find that part # on Atech.(summit) .. is that the steel type and the bolt kit is 134-6006?

also they dont carry katech.. i havent checked jegs yet
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Old 06-21-2012, 01:36 AM   #11
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Yes, 134-6006. I have plenty in stock; we always check them in our machine shop. Sometimes they drop in and other times they need sizing, my personal opinion is Kaltech or ARP or any other brand, always check no matter what the manufacturer claims.
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Old 06-21-2012, 06:25 AM   #12
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Quote:
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Yes, 134-6006. I have plenty in stock; we always check them in our machine shop. Sometimes they drop in and other times they need sizing, my personal opinion is Kaltech or ARP or any other brand, always check no matter what the manufacturer claims.
7 of 8 of my stock rods were fine. One was borderline, so I just ran it. after a few (50+) runs when it came apart that bearing was shiny in a few spots but never showed anything past the babbit
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Old 06-21-2012, 06:28 AM   #13
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Many are budget building and want the quick swap for cheap insurance. I say spin that bastard up with the stock bolts, lol. Replace if you have it apart and check size. Spin my stockers to 7200, no complaints.
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Old 06-24-2012, 06:34 PM   #14
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Thanks to all that responded. I ended up getting the ARP pro series rod bolts p/n 234-6301 And gave them to the machine shop to resize them. Not sure if it really needed them, but it gives me a little piece of mind! I read that the pro sreies had 220,000 lbs of tensil strength & the stock replacement (134-6006) have 190,000 lbs, not sure if that makes any differnce for my application, but they were only a few bucks more.
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Last edited by tommy396; 06-24-2012 at 07:13 PM.. Reason: adding info
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Old 06-25-2012, 03:32 AM   #15
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You would break a rod or piston way before the 190k pieces.
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Old 06-25-2012, 09:19 PM   #16
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what resizing rods cost you?
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Old 06-25-2012, 09:41 PM   #17
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Quote:
Originally Posted by cartel View Post
what resizing rods cost you?
Hey Cartel, I'm not sure yet, I dropped the pistons & rods off at the machine shop on Fri & left town til Wed. He said that even if he had to resize all of them it would be a max of 2 hrs labor. plus the bearings. I'll let you know exactly what it cost me when I pick them up Wed night.
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Old 07-09-2012, 12:32 PM   #18
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Quote:
Originally Posted by tommy396 View Post
Hey Cartel, I'm not sure yet, I dropped the pistons & rods off at the machine shop on Fri & left town til Wed. He said that even if he had to resize all of them it would be a max of 2 hrs labor. plus the bearings. I'll let you know exactly what it cost me when I pick them up Wed night.
Any news on the cost to resize?
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Old 07-09-2012, 01:20 PM   #19
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Any news on the cost to resize?
Yeah man, picked everything up last week, he resized all of them for $80.00, then had to buy different bearings that were .002 larger on the the outside. it was well worth a little extra $$ for me, just for the peace of mind.
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Old 07-10-2012, 08:09 PM   #20
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the rod bolts arent really the weak link anyway...the rods are. if your going that far toss the stockers and get even a half decent aftermarket rod.

i have all the stock **** in mine and spin it 7100. so far so good.
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Old 07-10-2012, 08:09 PM
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