Rocker stud problem

B

Buster

New member
I recently installed a set of (ported flow tech) L35 heads with APR screwed in rocker studs, after installing my 1.52 Comp Magnum rockers I've ran into a problem, with the valves adjusted the self locking nut is only flush with the top of the rocker stud, basically it's barely on there.

I'm wondering what to do? Should put a washer underneath the rocker stud to give it a little more length, buy shorter pushrods, buy longer studs (not sure they exist), or buy shorter valves?

One more thing, I measured the valves and it seems the're about one-tenth of an inch longer than the stock valves, this maybe part of the problem, but I'd rather mess with the rocker studs or pushrods unless I absolutely have to buy shorter valves.
 
M

MikeRenz

not stock
can the rocker fit over the arp stud when the valve isn't in the way? It sounds like you don't have the right size studs.
 
B

Buster

New member
Yes, it fits with the valve and pushrod in place too, but the locking nut doesn't seem to be threaded in far enough down the stud, its close, but I'm told there should be at least 2-3 threads showing above the nut.
 
M

MikeRenz

not stock
cranerocker.JPG


that nut? it will show more than 2-3 threads. I don't follow.
 
B

BillC

New member
The top part of the ARP studs are a little on the short side. Probably to give extra clearance for short valve covers.

One option to raise the studs is to get some hardened/ground head bolt washers, and put them under the studs. The washers are 1/8" thick, same as guide plates, so there will be plenty of threads left beneath the studs to hold them in the head. I did this a couple of years ago when I switched from guided to self-guiding rockers, and never had any problems.

Another option is to get some guide plates and cut the "guiding" fingers off, and then install them under the studs. Probably cheaper and easier to just get the washers.
 
Christian Dionne

Christian Dionne

Member
Mark, when installed completely, does the roller sit in the middle of the valve stem? As you rotate the cam, the rocker should roll from one end of the valve to the other. If it's not aligned properly, possibly a shorter pushrod is needed. Did you deck the block or heads?
 
B

Buster

New member
BillC said:
The top part of the ARP studs are a little on the short side. Probably to give extra clearance for short valve covers.

One option to raise the studs is to get some hardened/ground head bolt washers, and put them under the studs. The washers are 1/8" thick, same as guide plates, so there will be plenty of threads left beneath the studs to hold them in the head. I did this a couple of years ago when I switched from guided to self-guiding rockers, and never had any problems.

Another option is to get some guide plates and cut the "guiding" fingers off, and then install them under the studs. Probably cheaper and easier to just get the washers.
Click to expand...

I'm going to try the head bolt washers.

Thank You.
 
B

Buster

New member
Christian Dionne said:
Mark, when installed completely, does the roller sit in the middle of the valve stem? As you rotate the cam, the rocker should roll from one end of the valve to the other. If it's not aligned properly, possibly a shorter pushrod is needed. Did you deck the block or heads?
Click to expand...

I'll have to check, the rollers are not aligned perfectly, there on the valve stem, but closer to one side than the other, after getting them all adjusted, I'll rotate the motor and make sure the're ok.

Thanks
 
M

MikeRenz

not stock
when the valve is fully closed the roller will be closer to the inside of the valve stem. The middle when half open. And closer to the outside when fully open.
 
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