Head bolt length?
Head bolt length? 
02-09-2010, 01:23 PM
#6
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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.
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02-10-2010, 02:00 PM
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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
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Mr_Goodwrench (02-28-2024)
02-10-2010, 08:08 PM
#15
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
08-07-2023, 06:57 PM
#18
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.
08-07-2023, 09:04 PM
#19
TECH Senior Member
04 on up uses the later all short bolts
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JDR (08-08-2023)
08-08-2023, 07:25 AM
#20
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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.
The following users liked this post:
JDR (08-08-2023)