NotDads442

I bought some comp rocker arms and guide plates from a forum a member, no rocker arm studs purchased nor suggested. Box from Comp says I need studs which are not available by themselves from Comp nor ARP. This is ******* awesome. Wasn't given any instructions on valve height. Rocker arm installed with factory bolts an Comp pivots is hitting the edge of the valve spring. I am sick of having to order more **** all the time. Can I just run my factory pushrods and rocker arms with my Engle 22/25 cam?

dragline

If you check the thread spec for the head and nut, I believe it is a common stud used by Ford small blocks and other mfg's. Maybe someone else can verify 7/16-14 for the base, 3/8-24 for the nut. Maybe ARP can cross reference for you.
https://www.summitracing.com/parts/a...iABEgIMpfD_BwE

BillK

What part number did you purchase ? You probably need the Comp 4542-16 studs.

olds 307 and 403

With stock heads, those are what you need, I am running them.

BillK

Depends on which rockers he has. The better Comp rockers need a 7/16 stud. Those studs will not work for them.

grannys442

Ive got the 4542 studs and stamped Comp roller “tip” rockers. Budget conscience build but i’d urp up the loot for mild roller if I could use moderately priced rockers and stock 5/16” thread size.

So the question remains: Curious if’s reasonably possible to control a mild roller set up with a 300-310 open spring rate ? Something like a .485 lift running less than 5500.

cutlassefi

The lobe aggressiveness as well as the extra weight of the roller lifter are what necessitate the higher spring pressures.
Erson has some pretty mild Hyd roller profiles that should work with the lighter spring pressures and lower rpm ceiling.