COMP cam magnum rocker nut failure - Page 2 - Lateral-g Forums

Vegas69 · #11 08-01-2011, 11:18 PM

I agree, not much thread engagement. You are only getting to the shoulder.

bigtime · #12 08-01-2011, 11:25 PM

Now don't forget pushrod length also contributes to where the rocker will sit on the stud. Did you check geometry or is this all *stock*

You can go to ARP's site and get the length or i can measure a set tomorrow for you.

I just found a pic of where the adjuster should be.

g356gear · #13 08-01-2011, 11:33 PM

Quote:

Originally Posted by bigtime

Now don't forget pushrod length also contributes to where the rocker will sit on the stud. Did you check geometry or is this all *stock*

You can go to ARP's site and get the length or i can measure a set tomorrow for you.

I just found a pic of where the adjuster should be.

From your pic, mine are way too low in the nut. These pushrods are Magnums as well....just a hair over 8 1/4" in length. Studs are stock, guide plates are COMP. Stock BBC heads.

ARP site says 3/8" should be 1.895 with roller rockers vs 1.750 stock length.

bigtime · #14 08-01-2011, 11:39 PM

I can measure the arps in the morning for you. Im out of here now.

bigtime · #15 08-02-2011, 08:57 AM

g356gear · #16 08-02-2011, 11:06 PM

So I picked up the new 1/4" longer ARP studs and ARP keepers today. I still think there may be an issue. The nut takes 5 1/4 full turns before it bottoms out on the rocker. The allen screw takes 8 full turns before it bottoms out. Is this still too deep? They are not even close to Bigtime's pic above. I had the pushrod length checked and they are the correct intake and exhausts.

g356gear · #17 08-03-2011, 08:17 PM

Apparently, the rule of thumb is that the amount of thread engagement should equal the diameter of the stud.

70rs · #18 08-16-2011, 04:39 PM

Any updates on the stud / rocker issue? What did you end up doing to resolve it? Were you able to get enough thread engagement to equal the stud diameter?

g356gear · #19 08-23-2011, 09:23 PM

Quote:

Originally Posted by 70rs

Any updates on the stud / rocker issue? What did you end up doing to resolve it? Were you able to get enough thread engagement to equal the stud diameter?

I installed the longer ARP studs and hardware. 5 1/4 turns is juuuust equal to the stud diameter so I think I will be OK. I ran the car and it sounded good but have not been able to take the car out yet on the road. it did smoke a little from having no intake valve opening while the car was running without the rocker. Hopefully I can put some miles on it and see if it holds together. (fingers crossed)

70rs · #20 08-26-2011, 11:48 AM

Good luck!