Rocker Arm/Rocker Stud Problem!!

BoostedSUV

BoostedSUV

Active member
I was having problems with the pressed in rocker studs pulling out under a load in my new motor. Had to constantly adjust valve lash... I talked to a few people who suggested installing screw in studs. I bought a set of screw in studs and I removed all the pressed in ones, taped the head and isntalled the screw in studs. Now my rocker arms wont work!!! Nobody mentioned this, including the guy who built the motor in the first place! The body of the rocker arm is resting on the "nut" on the base of the screw in studs... They are Comp Cams 1.6 long slot rockers. Can I change to longer pushrods? Different rocker arms?? Please tell me I don't have to pull the motor back out and machine the head! I have pulled the motor 3 times already trying in the last month to discover what my problem with bending pushrods and adjusting rockers is!! I have less than 100miles on this thing and have had nothing but problems. I hope someone has an answer... thanks!
 
cloneman315

cloneman315

Active member
Re: Rocker Arm/Rocker Stud Problem!!

well i think u have to do machining for the 1.6s ,i can give u all the numbers for the parts my buildr used but they are for 1.5s which maybe u should switch 2 ,what heads cam etc?
 
BoostedSUV

BoostedSUV

Active member
Re: Rocker Arm/Rocker Stud Problem!!

stock heads, comp 412 cam, comp 1.6 rockers, and comp screw in studs.
 
JSM

JSM

Active member
Re: Rocker Arm/Rocker Stud Problem!!

It sounds like you have too short of a pushrod. The problem is you don't just throw longer pushrods in a motor and call it good, there is something called valve train geometry which can cause a lot of havoc.

The stud issue is part of this havoc you are seeing.

If the guy built the motor, he either needs to fix it or doesn't understand how to build a modified motor.
 
myclone

myclone

Donating Member
Re: Rocker Arm/Rocker Stud Problem!!

To add to what JS said the bosses in the heads where the studs press/screw in need machined down the same amount of the nut thickness on the screw in stud. If not you'll run into the exact problem your seeing now in that the studs stick up too far so that when the rocker is adjusted it bottoms against the nut on the stud. Longer push rods isnt a fix since it will just throw the geometry WAY off as far as where the the rocker contacts the valve during its arc.

The stud bosses in the heads need machined when replacing pressed in studs with screw in studs. Period.
 
cloneman315

cloneman315

Active member
Re: Rocker Arm/Rocker Stud Problem!!

that was the machine work i ment,i think maybe u would be better off with just roller tip 1.5s maybe?
 
BoostedSUV

BoostedSUV

Active member
Re: Rocker Arm/Rocker Stud Problem!!

if I can throw a set of 1.5 ratio rockers on there and be good to go i would be fine with that. I need to know for sure what I need to do b4 I waste anymore time.
 
Robert Lone

Robert Lone

MUTANT
Re: Rocker Arm/Rocker Stud Problem!!

There is a screw in factory style replacement rocker stud for SBC's. I don't know the brand or part number but it's an easy fix.

Pull the press-in studs, tap the holes to 3/8X16, lock-tite and srew them in. Once installed they look almost factory. Insted of having the nut-head on the base, it just has a small shoulder at the base of it to bottom out on. They have nothing on them to get in the way of aftermarket rockers. I'm not implying that they are as good as ARP's. I'm sure they're not. However they are susposed to be as strong or stronger than original.

Check w/ the engine supply houses. Buck's in Greenville, SC is where my old boss man got them from, but I don't have a clue who makes them.
 
BoostedSUV

BoostedSUV

Active member
Re: Rocker Arm/Rocker Stud Problem!!

If anyone can help out with the part #'s of the factory style screw-ins That would be great. My holes are already taped 7/16"-14, that is the proper thread for the screw in studs. -Matt
 
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