Gen3 VS Gen4 Stud length requirements…
Thread Starter
Joined: May 2011
Posts: 8,483
Likes: 1,028
From: Wichita, KS
Gen3 VS Gen4 Stud length requirements… Quick sanity check…
I know the “Gen3” engines require the 2 different length studs. And “Gen4” use all equal length studs. I assumed this was due to the bolt hole height in the head?
My last eng was a 2006 4.8 with 706 heads. I used a “Gen4” equal length ARP stud kit. I am putting together what I was told was a “gen3” 6.0 now. It came with 317 casting heads 24x reluctor wheel. When looking at the 706 VS the 317 head I don’t notice any difference in the head bolt hole heights. I had assumed I’d need the gen3 stud kit. Now I’m second guessing myself. Wondering if I managed to get gen4 317 heads? I don’t have a set of gen3 heads to compare it to. Am I missing something obvious? Simple way to tell?
Thanks
I know the “Gen3” engines require the 2 different length studs. And “Gen4” use all equal length studs. I assumed this was due to the bolt hole height in the head?
My last eng was a 2006 4.8 with 706 heads. I used a “Gen4” equal length ARP stud kit. I am putting together what I was told was a “gen3” 6.0 now. It came with 317 casting heads 24x reluctor wheel. When looking at the 706 VS the 317 head I don’t notice any difference in the head bolt hole heights. I had assumed I’d need the gen3 stud kit. Now I’m second guessing myself. Wondering if I managed to get gen4 317 heads? I don’t have a set of gen3 heads to compare it to. Am I missing something obvious? Simple way to tell?
Thanks
The different length is in the block not the heads. The only way I know that is I got a set of 317 heads and a whole set of equal length bolts and when I put the bolts into the block without the heads on the corner bolts drop in much further than the rest of them before hitting threads.
Last edited by RatCityRex; Jan 12, 2015 at 10:37 AM.
Thread Starter
Joined: May 2011
Posts: 8,483
Likes: 1,028
From: Wichita, KS
The different length is in the block not the heads. The only way I know that is I got a set of 317 heads and a whole set of equal length bolts and when I put the bolts into the block without the heads on the corner bolts drop in much further than the rest of them before hitting threads.
TECH Fanatic
Joined: Jun 2003
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It might be based on the age of the block.
Just got my GM 6.0L Gen III Cast-Iron Engine Block from TSP as a built LQ9 370. . Was told by TSP that the newer GM Gen III blocks require long studs.
Originally thought just a TSP short block to save money because I already had ARP short and long with heads, etc. TSP told me I wouldn't be able to use them.
Is there a way to tell based on a casting number or serial number?
You have PM.
Just got my GM 6.0L Gen III Cast-Iron Engine Block from TSP as a built LQ9 370. . Was told by TSP that the newer GM Gen III blocks require long studs.
Originally thought just a TSP short block to save money because I already had ARP short and long with heads, etc. TSP told me I wouldn't be able to use them.
Is there a way to tell based on a casting number or serial number?
You have PM.
Do you have the block? Just stick something in the bolt holes like a straw to see how deep they go. If all the same then you'll know.
FWIW, I have an 04 C5. I bought ARP equal length studs and it was wrong. For some reason my block has the 2 different lengths. If you try to bolt the heads down with the longer studs they just won't go in all the way. Youll know if you stick something in the holes.
FWIW, I have an 04 C5. I bought ARP equal length studs and it was wrong. For some reason my block has the 2 different lengths. If you try to bolt the heads down with the longer studs they just won't go in all the way. Youll know if you stick something in the holes.
04.5+ Gen III are supposed to have the all short length head bolt length. So you can certainly have knock sensors in the valley with short-length bolts. For example, all the L33s came that way and they were made until 2007.
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Verdad Gallardo Good to know. That explains why my 04 had 2 difft lengths.
Shouldn’t have to run longer corner studs even in a gen 3 then as long as the threads are up to the deck. You don’t bottom a stud out anyway (at least you’re not supposed to). Don’t see why you couldn’t use the gen IV one length studs.
