Rollor Rocker stud problem

JuStBlAzIN

Active member
I bought ARP-100-7201 3/8 stud for the vortec heads. i also have the man comp cam full rollor rockers, with the 1.5 ratio. cant remember the part number of hand. They are the ones that have the roller on the tip and in the center. My problem is that the stud is too short. anyone have any recomendations?
 

cloneman315

Active member
Re: Rollor Rocker stud problem

i have same setup pm me tommorow i will look on my build sheet and see what ones ihave
 

93ty475

Donating Member
Re: Rollor Rocker stud problem

stud is too short to get the poly lock on or you ran out of threads to fully tighten down the rocker?
 

Big Mike

New member
Re: Rollor Rocker stud problem

They are to short, you can either put hardened washers under the studs to raise them up or get some guide plates and cut them up to use as spacers or swap out to the 7/16 stud they may be the right length but Comp does not make self aligning in this size so you will be using guide plates maybe some one else does if you want a full roller rocker, or get your heads drilled and have inserts put in for standard threads. http://www.machperformance.com/ sells a kit that includes studs and washers same short ARP studs and hardened washers. I was told they can also make the conversion to standard studs using inserts. I had heard other people on SYTY.net could do this for you too you just need to ask. I had this problem too I had called ARP and they wanted over $1000.00 just for 1 set of what i needed, I told them if they made them they could sell them. I bet if you get a GP going you could get enough people to make the price reasonable. You may want to ask ARP to look in their bins for a stud that will fit your application from a previous run someone had done. When I did my motor I had contacted ARP and they found enough studs right length with the metric bottom and 3/8 top for my motor. I guess I had gotten luckey, but I did wind up paying over $100.00 for the set shipping extra. I'm not sure if they had any left from the run I bought them from or not.

Good Luck
 

JuStBlAzIN

Active member
Re: Rollor Rocker stud problem

93ty475 said:
stud is too short to get the poly lock on or you ran out of threads to fully tighten down the rocker?

i guess it is the same since the stud is too short i run out of thread to get the poly lock on them.

i will have to look up the actual part number on the rockers. the machin shop said all they need is a small spacer underneath the stud inbetween the head and the head. to give it more threads on the top side.
 

Lynn D. Brown

New member
Re: Rollor Rocker stud problem

If anybody is interested, I have a complete set of Comp Cam rollers for the SyTy's. Only ~ 1000 Mi on them. U will need guide plates with them.
 

ed hess

race or get outta the way
Re: Rollor Rocker stud problem

if you look at what arp sells you will see a longer stud that is metric. its for a big block chevy. this solves the problem without machining out the original thread. if you had the 60deg v6 studs in the vortecs which is what i saw in my old vortecs when i ran into the same problem. yes you read that right. 60 deg v6 studs. dont ask me why but that what i have seen in them and they come up to short for roller rockers. they short ones are ok for roller tip but not for full rollers.

ed
 

JuStBlAzIN

Active member
Re: Rollor Rocker stud problem

ed hess said:
if you look at what arp sells you will see a longer stud that is metric. its for a big block chevy. this solves the problem without machining out the original thread. if you had the 60deg v6 studs in the vortecs which is what i saw in my old vortecs when i ran into the same problem. yes you read that right. 60 deg v6 studs. dont ask me why but that what i have seen in them and they come up to short for roller rockers. they short ones are ok for roller tip but not for full rollers.

ed

ed you happen to have a part number on those?
 

ed hess

race or get outta the way
Re: Rollor Rocker stud problem

JuStBlAzIN said:
ed you happen to have a part number on those?

135-7201 they use a m10-x1.5 metric into the head.

stud is 7/16-20

this means the rockers you bought which are 3/8 you cant use.

but the 7/16 wont flex as much.

while your at get some adjustable pushrod plates and correct your geometry because you wont find self aligning 7/16 rockers.

have fun. :)

ed
 
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