yeah I am aware that they have advised different numbers.
ARP Crank Bolt Torque
Thread Starter
Pro
Joined: Mar 2007
Posts: 578
Likes: 0
From: Mission Viejo CA
ARP Crank Bolt Torque
Hope this is helpful, there has been a lot of posts with different suggestions on torque for the crank bolt.
Spoke to ARP today and they recommend 235 ft lbs torque on their
harmonic balancer bolt (using ARP moly lube).
Again this is for the ARP bolt P/N 234-2503 with their lube.
By the way, the vendor who I bought the ARP bolt from would not recommend a torque number but they suggested to clean the threads
and install dry.
savage1
Spoke to ARP today and they recommend 235 ft lbs torque on their
harmonic balancer bolt (using ARP moly lube).
Again this is for the ARP bolt P/N 234-2503 with their lube.
By the way, the vendor who I bought the ARP bolt from would not recommend a torque number but they suggested to clean the threads
and install dry.
savage1
Thread Starter
Pro
Joined: Mar 2007
Posts: 578
Likes: 0
From: Mission Viejo CA
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
That is one reason I called them several times prior to doing my heads. Their tech support just seems to be all over the place. I just installed mine last week at 190 lb-ft. Oh well, never came out in 11K miles with 190.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Tech Contributor
Joined: Jan 2007
Posts: 19,450
Likes: 1,155
From: Dyer, IN
By the way, if you would have just bought a new GM bolt.......you'd be done by now...
Thread Starter
Pro
Joined: Mar 2007
Posts: 578
Likes: 0
From: Mission Viejo CA
lucky131969
By the way, if you would have just bought a new GM bolt.......you'd be done by now...
By the way, if you would have just bought a new GM bolt.......you'd be done by now...
I feel pinning and ARP bolt is the way to go. I will see if I can't get something from ARP to eliminate the confusion. Will post what I find out.
savage1
Tech Contributor
Joined: Jan 2007
Posts: 19,450
Likes: 1,155
From: Dyer, IN
Last edited by lucky131969; Nov 11, 2008 at 01:32 AM.
Thread Starter
Pro
Joined: Mar 2007
Posts: 578
Likes: 0
From: Mission Viejo CA
Hmmmm..I not sure where the trouble lies with getting the bolt to 140 degrees. I pinned my balancer when I installed my supercharger, and installed a new GM bolt. Zero issues. I'm not saying that getting it to 140 degrees was easy......I had to use a 3 foot piece of pipe on a 1/2 drive
I did not install mine last time and I did not have it pinned. This time I will do it myself and pin it. I am not suggesting that the vendor who did my install did not torque it correctly but somehow my pulley spun and the crank bolt is loose.
savage1
Melting Slicks
Joined: Dec 2003
Posts: 3,315
Likes: 17
From: Near Jacksonville Fl.
I don't know either but I have read a lot of posts that said they couldn't get there and called it quits short of the mark. Maybe they didn't have the correct tools and an appropriate cheater bar. Maybe it had something to do with the crank turning?
I did not install mine last time and I did not have it pinned. This time I will do it myself and pin it. I am not suggesting that the vendor who did my install did not torque it correctly but somehow my pulley spun and the crank bolt is loose.
savage1
I did not install mine last time and I did not have it pinned. This time I will do it myself and pin it. I am not suggesting that the vendor who did my install did not torque it correctly but somehow my pulley spun and the crank bolt is loose.
savage1The whole reason GM and everyone else is using the higher number is they have to in case the balancer is not pinned.
The virtue of pinning stops any relative motion between the balancer and the crankshaft therefore the bolt is only holding it against the shoulder and not used in twisting retention.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
I have been very frustrated with ARP the last couple of years. It used to be the tech support was the guys who tested and knew what was going on, but now it is just someone who looks it up on the computer. I got three different values for my head stud kit when I called, I finally asked to speak with someone who was familiar with the testing to obtain the value.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Well,,,,,
,,,,,I just installed a Powerbond damper (pinned it to the crank) and used the ARP bolt (was told to use 235 ft/lbs by ARP.) on my 02 Z.
Its in there with 235 ft/lbs, and I used a MONGO 3' 0-250 ft/lb Torque wrench and a 24" strap wrench to hold the damper stationary.
All I can say is that, it torqued up easily without any issues and if it can hold up to the hell I put it through, it not going to break.
BC
,,,,,I just installed a Powerbond damper (pinned it to the crank) and used the ARP bolt (was told to use 235 ft/lbs by ARP.) on my 02 Z.Its in there with 235 ft/lbs, and I used a MONGO 3' 0-250 ft/lb Torque wrench and a 24" strap wrench to hold the damper stationary.
All I can say is that, it torqued up easily without any issues and if it can hold up to the hell I put it through, it not going to break.
BC
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Well,,,,,,,,,,I just installed a Powerbond damper (pinned it to the crank) and used the ARP bolt (was told to use 235 ft/lbs by ARP.) on my 02 Z.
Its in there with 235 ft/lbs, and I used a MONGO 3' 0-250 ft/lb Torque wrench and a 24" strap wrench to hold the damper stationary.
All I can say is that, it torqued up easily without any issues and if it can hold up to the hell I put it through, it not going to break.
BC
,,,,,I just installed a Powerbond damper (pinned it to the crank) and used the ARP bolt (was told to use 235 ft/lbs by ARP.) on my 02 Z.Its in there with 235 ft/lbs, and I used a MONGO 3' 0-250 ft/lb Torque wrench and a 24" strap wrench to hold the damper stationary.
All I can say is that, it torqued up easily without any issues and if it can hold up to the hell I put it through, it not going to break.
BC
Melting Slicks
Joined: Aug 2006
Posts: 2,167
Likes: 11
From: Powell TN
Cruise-In VIII Veteran
