Rod Bolts - ZR-1 Net Registry Forums

LGAFF · 06-13-2011

Well, I broke down and bought the Marc Haibeck Rod Bolts......some say the rod bolts can be reused, like LS1, others not..

Lets hear your throughts.....

I probably would have reused if I was using the rod stretch method, but will be using 22 ftlbs and then torque angle of 80 degrees(if I recall)

mike100 · 06-13-2011

I would probably would have preferred to buy the new ones as well. I've had a small block spin a rod bearing before on thrice torqued rod bolts...granted the new owner of that car spun it to 8k a couple of times, but still, I had it to 7500+ more than a few times, but that was before the rebuild.

I would probably use the stretch method to check a few bolts to see how spec torque increased length. I don't know too much about torque-to-yield... at least not using an angle wrench as I don't have one.

lbszr · 06-14-2011

I used the bolt stretch method on Marc's bolts. Since the oem's are torqued to yeild, I wouldn't reuse them. If I remember right, the arps should not be reused either, unless the stretch method is used.

HAWAIIZR-1 · 06-14-2011

Lee,

I'm with you and broke my piggy bank to get Marc's rod bolts too. I did not want to take any chances and thought that con rods and bolts take on the most stress in the bottom half. I did a lot of better safe than sorry since I was building my own motor and did not have enough experience to consider otherwise. Call me Paranoid with a capital P; my rod bolts were considered somewhat new coming from a crate motor takeoffs for the rods and pistons I bought, but still previously torqued regardless.

mike100 · 06-14-2011

Additionally:

How much rpm/ piston speed is too much for the LT5? If you stretched the old rod bolts at all, do the rods need to be re-sized? If they are already egg shaped, the new bolts might not help.

Then again, if you didn't have a lower end failure when the engine came out, everything may still be ok.

Kevin · 06-14-2011

the lt5 was designed to go to 8k+ if I remember correctly but the accessories wouldn't handle that. if i'm rebuilding a motor that I beat on as hard as I do my lt5 i'm not taking chances

flyin ryan · 06-16-2011

For the record, anytime new/different rod bolts are to be, the rods should always be re-sized.

06-13-2011	#1
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,180	Rod Bolts Well, I broke down and bought the Marc Haibeck Rod Bolts......some say the rod bolts can be reused, like LS1, others not.. Lets hear your throughts..... I probably would have reused if I was using the rod stretch method, but will be using 22 ftlbs and then torque angle of 80 degrees(if I recall) __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 06-13-2011 at 11:22 PM.

06-13-2011	#2
mike100 Join Date: Feb 2011 Location: San Marcos CA Posts: 1,786	Re: Rod Bolts I would probably would have preferred to buy the new ones as well. I've had a small block spin a rod bearing before on thrice torqued rod bolts...granted the new owner of that car spun it to 8k a couple of times, but still, I had it to 7500+ more than a few times, but that was before the rebuild. I would probably use the stretch method to check a few bolts to see how spec torque increased length. I don't know too much about torque-to-yield... at least not using an angle wrench as I don't have one.

06-14-2011	#3
lbszr Join Date: Nov 2006 Location: dayton,ohio Posts: 424	Re: Rod Bolts I used the bolt stretch method on Marc's bolts. Since the oem's are torqued to yeild, I wouldn't reuse them. If I remember right, the arps should not be reused either, unless the stretch method is used.

06-14-2011	#4
HAWAIIZR-1 Join Date: May 2010 Location: Japan Posts: 3,108	Re: Rod Bolts Lee, I'm with you and broke my piggy bank to get Marc's rod bolts too. I did not want to take any chances and thought that con rods and bolts take on the most stress in the bottom half. I did a lot of better safe than sorry since I was building my own motor and did not have enough experience to consider otherwise. Call me Paranoid with a capital P; my rod bolts were considered somewhat new coming from a crate motor takeoffs for the rods and pistons I bought, but still previously torqued regardless. __________________ Craig "ZR-1 NO KA 'OI" "ZR-1 ICHIBAN" 1995 #228 Black/Black with Dunn Heads ZR-1 owner since September 2003 ZR-1 Net Registry Founding Member #0074 NCM Lifetime Member #2048 Last edited by HAWAIIZR-1; 06-14-2011 at 09:22 AM.

06-14-2011	#5
mike100 Join Date: Feb 2011 Location: San Marcos CA Posts: 1,786	Re: Rod Bolts Additionally: How much rpm/ piston speed is too much for the LT5? If you stretched the old rod bolts at all, do the rods need to be re-sized? If they are already egg shaped, the new bolts might not help. Then again, if you didn't have a lower end failure when the engine came out, everything may still be ok.

06-14-2011	#6
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,624	Re: Rod Bolts the lt5 was designed to go to 8k+ if I remember correctly but the accessories wouldn't handle that. if i'm rebuilding a motor that I beat on as hard as I do my lt5 i'm not taking chances __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

06-16-2011	#7
flyin ryan Join Date: Aug 2006 Location: Edmonton, Alberta or Phoenix, Arizona Posts: 2,736	For the record... For the record, anytime new/different rod bolts are to be, the rods should always be re-sized.