Help Replacing Rod Bolts/Balancing Lower End of Motor
#2484705
04/18/18 05:24 PM
04/18/18 05:24 PM
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Joined: Apr 2012
Posts: 1,565 Macomb, MI
vinnyd76
OP
pro stock
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OP
pro stock
Joined: Apr 2012
Posts: 1,565
Macomb, MI
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Looking to have the lower rotating assembly balanced in a SB. Original connecting rods will be used with new forged pistons (new main and rod bearings). I'm told that many engine builders will re-hone rods when new bolts are used. Common practice? I was also told that if I balance the rotating assembly with the stock rod bolts and change them out after balancing over config will change slightly. For example ARP bolt heads are different from stock. Looking for input on what should be done. Should I just purchase new rods? Replace bolts/hone, do not replace connecting rod other? Not sure if a manufacturer has exact replacement rod bolts to the originals.
Thank you in advance for your feedback!
Last edited by vinnyd76; 04/18/18 05:41 PM.
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Re: Help Replacing Rod Bolts/Balancing Lower End of Motor
[Re: NANKET]
#2484717
04/18/18 05:47 PM
04/18/18 05:47 PM
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Joined: Apr 2012
Posts: 1,565 Macomb, MI
vinnyd76
OP
pro stock
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OP
pro stock
Joined: Apr 2012
Posts: 1,565
Macomb, MI
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Do you brush you teeth before dinner or after?
What kind of driving are you doing with the engine? Nothing wrong with stock rods. Resize the rods, you are doing everything else. Yes they need to be done after ARP bolts installed.
Do ALL your machine work and parts replacement, then balance it last. Mostly street use to/from various car shows. Not much drag racing with this motor. Is it a common practice to replace the connecting rod bolts during an engine rebuild, if visually no damage to the stock bolts?
Last edited by vinnyd76; 04/18/18 05:47 PM.
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Re: Help Replacing Rod Bolts/Balancing Lower End of Motor
[Re: vinnyd76]
#2484722
04/18/18 05:54 PM
04/18/18 05:54 PM
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Joined: Jan 2003
Posts: 13,400 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,400
Marion, South Carolina [><]
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I always use ARP rod bolts in any hi-perf build, whether raced or not. Cheap insurance in my opinion.
Like said before, the rods always need to be resized after new bolts are installed and balancing is done last.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Help Replacing Rod Bolts/Balancing Lower End of Motor
[Re: dartgame]
#2484770
04/18/18 07:51 PM
04/18/18 07:51 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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& HF has a $9.95 digital scale that is just as accurate as my now deceased buddys high dollar one was. suspending the rod ends horizontle is tricky but search it & the other parts (pistons/pins/rings/locks (if used)? bearings weighing/comparing is easy, weigh em & compare to the old stuff. You can trim the rod big/small ends appropriately as needed. read up on it (youtube/google)
live every 24 hour block of time like it's your last day on earth
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Re: Help Replacing Rod Bolts/Balancing Lower End of Motor
[Re: vinnyd76]
#2484786
04/18/18 08:29 PM
04/18/18 08:29 PM
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Joined: Jan 2003
Posts: 20,212 Park Forest, IL
slantzilla
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,212
Park Forest, IL
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I have a buddy who put his ARP rod bolts in himself. It was his first rebuild and didn't ask any questions. Motor ran really good for about half a season and kicked a rod at the finish line. He wasn't aware that ARP bolts are press in. He just ground them down a little and pounded them in with a hammer.
Don't do that, have a machine shop install them.
"Everybody funny, now you funny too."
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