Head bolt length?
Head bolt length? I have a new LS1/LS6 block and I was informed that different year blocks had different length head bolts. Is there some truth to that? Anyone had experience with such a thing? Thanks.
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
I do know this, the older style is way more expensive in ARPs. I priced them when doing my build. Like $100 for the newer style and $200 for the older style.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
I dont know, the older style has all the exact same bolts except the top row of bigger bolts has a slightly shorter one on each end. The center ones for that row and the bottom row is identical. 2 bolts per head are about an inch shorter. The later sets which all the big bolts are the same length is cheaper. Doesnt make much sense to me....
S is short bolt, L is long bolt and T is the tiny bolts under the intake.
Old:
TTTTT
SLLLS
LLLLL
New:
TTTTT
LLLLL
LLLLL
S is short bolt, L is long bolt and T is the tiny bolts under the intake.
Old:
TTTTT
SLLLS
LLLLL
New:
TTTTT
LLLLL
LLLLL
I dont know, the older style has all the exact same bolts except the top row of bigger bolts has a slightly shorter one on each end. The center ones for that row and the bottom row is identical. 2 bolts per head are about an inch shorter. The later sets which all the big bolts are the same length is cheaper. Doesnt make much sense to me....
S is short bolt, L is long bolt and T is the tiny bolts under the intake.
Old:
TTTTT
SLLLS
LLLLL
New:
TTTTT
SSSSS
SSSSS
S is short bolt, L is long bolt and T is the tiny bolts under the intake.
Old:
TTTTT
SLLLS
LLLLL
New:
TTTTT
SSSSS
SSSSS
Teching In
Joined: Aug 2023
Posts: 6
Likes: 0
From: Illinois
Jon, my machine shop had to replace my LM7 block because they broke a tap off in a head bolt hole. I’m just finding out that this replacement block appears to take all short bolts. My original block used 16 longs and 4 shorts. I had already bought the ARP bolts with the long/short bolts. Part number 134–3609. Would you know what ARP bolt kit I need for this mystery block? Is there anyway to research what block I have? Thanks for your help.
Jon, my machine shop had to replace my LM7 block because they broke a tap off in a head bolt hole. I’m just finding out that this replacement block appears to take all short bolts. My original block used 16 longs and 4 shorts. I had already bought the ARP bolts with the long/short bolts. Part number 134–3609. Would you know what ARP bolt kit I need for this mystery block? Is there anyway to research what block I have? Thanks for your help.