guide plates/pushrod length/roller rockers
Thread Starter
Burning Brakes
Joined: Nov 2004
Posts: 800
Likes: 3
From: Port Orange FL
guide plates/pushrod length/roller rockers
I just keep having one dillemma after another with what was to be a simple project. 
Oh well I guess I am going to eat it one piece at a time. Heres the latest.
I am using Crane gold non S/A roller rockers with guide plates.
While mocking it up it appears that for the best rocker arm geometry I need a slightly shorter than stock pushrod. However even with the stock length rod I am nearly bottoming out the rocker on the stud. I only have about 1/2 turn worth of adjustment. With the shorter length pushrod it wont even get tight against the pushrod before the rocker bottoms out on the stud. So I guess I need studs with thinner jam nuts to compensate for the height of the guideplate? This seems like the least expensive solution at this point unless someone can guide me differently.
I noticed in the summit catalog that the screw in studs for oldsmobile/chrysler have very thin jam nuts with the proper size threading above and below. Has anyone used these or can reccomend a stud with a thin jam nut? Or another solution
Thanks
Roy
Oh well I guess I am going to eat it one piece at a time. Heres the latest.I am using Crane gold non S/A roller rockers with guide plates.
While mocking it up it appears that for the best rocker arm geometry I need a slightly shorter than stock pushrod. However even with the stock length rod I am nearly bottoming out the rocker on the stud. I only have about 1/2 turn worth of adjustment. With the shorter length pushrod it wont even get tight against the pushrod before the rocker bottoms out on the stud. So I guess I need studs with thinner jam nuts to compensate for the height of the guideplate? This seems like the least expensive solution at this point unless someone can guide me differently.
I noticed in the summit catalog that the screw in studs for oldsmobile/chrysler have very thin jam nuts with the proper size threading above and below. Has anyone used these or can reccomend a stud with a thin jam nut? Or another solution
Thanks
Roy
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
Originally Posted by Fastmax32168
I just keep having one dillemma after another with what was to be a simple project. Oh well I guess I am going to eat it one piece at a time. Heres the latest.
I am using Crane gold non S/A roller rockers with guide plates.
While mocking it up it appears that for the best rocker arm geometry I need a slightly shorter than stock pushrod. However even with the stock length rod I am nearly bottoming out the rocker on the stud. I only have about 1/2 turn worth of adjustment. With the shorter length pushrod it wont even get tight against the pushrod before the rocker bottoms out on the stud. So I guess I need studs with thinner jam nuts to compensate for the height of the guideplate? This seems like the least expensive solution at this point unless someone can guide me differently.
I noticed in the summit catalog that the screw in studs for oldsmobile/chrysler have very thin jam nuts with the proper size threading above and below. Has anyone used these or can reccomend a stud with a thin jam nut? Or another solution
Thanks
Roy
Oh well I guess I am going to eat it one piece at a time. Heres the latest.I am using Crane gold non S/A roller rockers with guide plates.
While mocking it up it appears that for the best rocker arm geometry I need a slightly shorter than stock pushrod. However even with the stock length rod I am nearly bottoming out the rocker on the stud. I only have about 1/2 turn worth of adjustment. With the shorter length pushrod it wont even get tight against the pushrod before the rocker bottoms out on the stud. So I guess I need studs with thinner jam nuts to compensate for the height of the guideplate? This seems like the least expensive solution at this point unless someone can guide me differently.
I noticed in the summit catalog that the screw in studs for oldsmobile/chrysler have very thin jam nuts with the proper size threading above and below. Has anyone used these or can reccomend a stud with a thin jam nut? Or another solution
Thanks
Roy
I had 1.6 rr's put in my LT1 motor when it was stock so I know that you should not need studs/pushrods/guideplates with that. I ran into trouble, though, with a new cam.
Thread Starter
Burning Brakes
Joined: Nov 2004
Posts: 800
Likes: 3
From: Port Orange FL
specs
I dont think it really changes the problem but I can supply the info. Its a basically stock LT1 with a mild LPE cam, ported heads with bigger valves, screw in studs with guide plates and crane gold r/r. I am certain it is just the particular combination that has set up this particualar situation. If I was using S/A rocker arms I dont think I would have an issue at all. The extra height of the guide plates seems to have set up this problem.
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
Likes: 71
From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
I wonder what the height of the valve tip is relation to the stock configuration? I have 2.00-1.60 valves and am still using stock length push rods w/ no geometry problems. I don't have the adjustment issue you mentioned either.
Thread Starter
Burning Brakes
Joined: Nov 2004
Posts: 800
Likes: 3
From: Port Orange FL
Valve lash caps
Geesh I just learned something new about building small blocks. And just when you think you have seen it all. Someone on another board suggested I use valve lash caps. I didnt even know these things existed but they are the perfect solution. Any problems associated with these that anyone knows about?
http://store.summitracing.com/defaul...=400114+300358
Roy
http://store.summitracing.com/defaul...=400114+300358
Roy
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
Originally Posted by Fastmax32168
Geesh I just learned something new about building small blocks. And just when you think you have seen it all. Someone on another board suggested I use valve lash caps. I didnt even know these things existed but they are the perfect solution. Any problems associated with these that anyone knows about?
http://store.summitracing.com/defaul...=400114+300358
Roy
http://store.summitracing.com/defaul...=400114+300358
Roy
Thread Starter
Burning Brakes
Joined: Nov 2004
Posts: 800
Likes: 3
From: Port Orange FL
caps
It would accomplish the same thing as using a shorter pushrod but with an additional benefit. It would move the geometry right over the center of the valve by raising the valve stem up slightly. A shorter pushrod would do the same thing however a shorter pushrod lowers the rocker and causes me an interference problem between the rocker and the stud. This would raise the rocker, increasing clearance between the rocker and the stud. So it solves both problems, increases rocker/stud clearance and corrects the geometry while allowing me to use a stock length pushrod.
Roy
Roy
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
