Has anyone used gen 4 rod bolts in gen 3 rods? I'm looking to buy replacements and the gen 3 part number (11610158) is a different part number to the gen rods (11570662). But, I know different part numbers don't always mean different parts, as the gen 5 rod bolts also have a different part number (11548432), but the gen 4 and gen 5 engines use the same connecting rod (whole assembly is the same part number between gen 4 and gen 5 connecting rods). Also, I called BTR about their connecting rods (BTR70662) and they said they use them in both gen 3 and gen 4 rods with no issues.

I can only find the gen 3 (11610158) listed for $15 a piece, and I'm not looking to spend $240 on rod bolts.

 

And why do you need new rod bolts?

 

I thought gm rod bolts are one time use? Can be torqued up to 3 times to check bearing clearance during assembly, but need to be replaced after in service/use.

 

GM rod bolts are Torque to Angle not torque to Yield. I have yet to see a GM rod bolt, even after being reused fail. Even after 24 PSI of boost...

ARP rod bolt set is $98.99 at summit. I wouldn't waste the money on the OEM bolts even If I had to replace them. Personally, I would just go aftermarket If I have to spend money replacing bolts and pin bushings on stock rods. They are just not worth reconditioning.

 

Thanks for the info on reusing. The GM service manual states that they are TTY, not TTA. But I appreciate the advice.

 

It looks like you are correct. How ever from personal experience, the early Gen 3 rods will break long before the fastener fails.

Please don't tell Matt Happel AKA Sloppy Mechanics. He is always reusing stuff...

 

I appreciate the practical real world experience. I'm an engineer and can understand why the OE specifications exist, but also understand that things can be "over engineered" and real world use/experience is very valuable. Thanks!

 

I have re-used gen3 rod bolts, as have many, many others without issue. I can’t say I have ever consulted a GM service manual for answers, however.

 

I've reused gen 3 rod bolts with ~250k miles on them and spun them to 7800.

 

GM likes to sell parts for extra income.

 

The most true statement I’ve read today. You win the internet today!

 

If you think that's bad, almost every bolt on the Gen V engines are "one time use."

Even the 8mm LOMA/ valley-cover bolts. GM's instructions for almost every component on those engines starts with "Remove and discard bolt..."

I've been inside of a lot of Gen V engines these days, and the only bolts I've bought new were the head bolts... And even then, I've reused them on a couple of engines.

 

GM has to pay for the billion dollar loss inquired from the engine recall/replacement somehow I suppose. I’m reusing all those fasteners…what a scam.

 

Im going to be the A$$ using GM words from that manual. State that they are TTY not TTA which is technically both one in the same if you want to argue semantics but my point is " how can one TTY a fastener 3 times in assembly if the fastener is a TTY type" ?

I'm sure i didn't miss my SOM class way back when. I can still draw the diagram on a black board but prefer crayon instead these days

Adding ARP hardware to rods is a whole other argument HAHAHA

PS reused rodbolts seem to end up at around 51-53 ll/ft tq but don't quote me on that

 

Agreed that a TTY fastener is a one time use fastener. You can not use it 3 times. I believe the wording is incorrect in the manual….but who reads manuals?
According to what I’ve determined using my digital SnapOn equipment, the rod bolts like 45-48 ft lbs when re-used.

 

I ended up reusing the stock bolts. I used the angle gauge and checked with the torque wrench. They all ended up ~48-50 ft lbs (oiled threads)