stud girdles ?
Melting Slicks
Joined: Dec 2001
Posts: 2,025
Likes: 1
From: Billings MT
Well isn't that the $100 question.
In more than one word, YES, and NO.
If for any reason there is deflection in the valve train it may be a good idea.
Case in point:
I recently switched from a hydraulic roller to a solid roller. The spring pressures went from 330lbs open to 440lbs open.
Not more than 80 miles later a rocker stud sheared off, bending a pushrod, breaking a lifter, beating up a valve and destroying a rocker arm. It could of been worse.
I have since upgraded to the ARP pro series rocker studs and use a girdle. This motor sees 7000rpm more than it should and still going strong.
So what were you considering using it on?
In more than one word, YES, and NO.
If for any reason there is deflection in the valve train it may be a good idea.
Case in point:
I recently switched from a hydraulic roller to a solid roller. The spring pressures went from 330lbs open to 440lbs open.
Not more than 80 miles later a rocker stud sheared off, bending a pushrod, breaking a lifter, beating up a valve and destroying a rocker arm. It could of been worse.
I have since upgraded to the ARP pro series rocker studs and use a girdle. This motor sees 7000rpm more than it should and still going strong.
So what were you considering using it on?
Thread Starter
Melting Slicks
Joined: Dec 2000
Posts: 2,130
Likes: 1
From: mesa,az
327 40 over, 11+ compression, edelbrock RPM heads, RPM airgap manifold , edelbrock RPM cam (488/510 lift 234/244 duration ),MSD ignition, 750 preformer carb. hooker header sidepipes with the JCL baffles in my 65 with 3.70 rear behind a Keisler 5 speed.street toy. occasional nostalga drags. (this car is new to me but i have a reputation of being "hard " on vehicials as my friends tell me. usually HI PO sport bikes and such )
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
As stated above by VETDRMS they sure are worth it if you need one 
I am using the Crane stud girdle the motor has over .600 in. lift with a solid roller cam and the springs are 450lbs open. I also used ARP 7/8 in. studs and CC Hi Tech roller rockers with Hi Tech .080 in. wall pushrods.
I am using the Crane stud girdle the motor has over .600 in. lift with a solid roller cam and the springs are 450lbs open. I also used ARP 7/8 in. studs and CC Hi Tech roller rockers with Hi Tech .080 in. wall pushrods.
Melting Slicks
Joined: Dec 2001
Posts: 2,025
Likes: 1
From: Billings MT
Panchop That sounds like it would be a real fun motor. In that case I don't think you would need them. If I'm correct that is a hydraulic flat tappet cam? It will limit the RPM's for you. Its just a matter of insurance, we all pay for it and hope we never need it!
Wayne 7/8"!!!
Man, those are HUGE! ROFL.
Wayne 7/8"!!!
Man, those are HUGE! ROFL.
Thread Starter
Melting Slicks
Joined: Dec 2000
Posts: 2,130
Likes: 1
From: mesa,az
Originally Posted by VETDRMS
Panchop That sounds like it would be a real fun motor. In that case I don't think you would need them. If I'm correct that is a hydraulic flat tappet cam? It will limit the RPM's for you. Its just a matter of insurance, we all pay for it and hope we never need it!
Wayne 7/8"!!! Man, those are HUGE! ROFL.
Wayne 7/8"!!!
Man, those are HUGE! ROFL.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
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
What Motor heads has are the best. Crane
The rule is: Before you set valve lash you should be able to place a straight edge right down the row of rocker studs. When you set the valve lash if it bends (deflects) the studs more than .030 when the spring is fully compressed you need a stud girdle.
I never leave home without one! My spring pressure is 540 open at .620 lift
The rule is: Before you set valve lash you should be able to place a straight edge right down the row of rocker studs. When you set the valve lash if it bends (deflects) the studs more than .030 when the spring is fully compressed you need a stud girdle.
I never leave home without one! My spring pressure is 540 open at .620 lift
Racer
Joined: May 2004
Posts: 391
Likes: 0
From: Chicago il
I dunno- I was wondering about it myself. I am still in the planning stages (and saving $$ stage!) for my 383. Debating on if I should get one or not.
Then it hit me- sure they are sort of expensive, but after all the $$ I will have in the engine, seems kind of cheap. A LOT cheaper than what could happen if I needed one and it wasn't there...
I am at this point planning on adding one to the finished motor. Maybe not right away, but as $$ allow. I know I will be taking it easy at first too- will need to get used to the power.
My stock '79 L-82 is the fastest car I've had... and it isnt really fast. :-)
~Kevin
Then it hit me- sure they are sort of expensive, but after all the $$ I will have in the engine, seems kind of cheap. A LOT cheaper than what could happen if I needed one and it wasn't there...
I am at this point planning on adding one to the finished motor. Maybe not right away, but as $$ allow. I know I will be taking it easy at first too- will need to get used to the power.
My stock '79 L-82 is the fastest car I've had... and it isnt really fast. :-)
~Kevin
Le Mans Master
Joined: Apr 2000
Posts: 7,562
Likes: 9
From: B'Ville NY
Cruise-In III Veteran
St. Jude Donor '05
For the cost of the girdles and the cost of all the moving parts in an engine, I would recommend using them 
Vetdrms experience without them made my decision to go with them that much stronger. Learn from others experiences/ expenses 
Vetdrms experience without them made my decision to go with them that much stronger. Learn from others experiences/ expenses
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by gkull
The rule is: Before you set valve lash you should be able to place a straight edge right down the row of rocker studs. When you set the valve lash if it bends (deflects) the studs more than .030 when the spring is fully compressed you need a stud girdle.
RACE ON!!!
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
I see you guys have used the Crane stud girdle too. The polylocks on mine were too big for the Hi Tech RR so I had all 16 of them machined down I forget but I think about 20 thou or so, did you guys (gkull or SmokedTires) run into that little problem ?
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
The Crane locking nuts 7/16th don't fit down inside the the Comp Cams or Crower Steel roller rockers so you have spin them on a lath to decrease the lower nut diameter. I think that I decreased the diameter .030 about .040 up.
That rule I made up! Years ago I saw deflection when I was assembling heads and I ask someone about it???? Movement is torquing the studs which will lead to eventual failure and it's a loss of valve lift from the get go. 
That rule I made up!
Years ago I saw deflection when I was assembling heads and I ask someone about it???? Movement is torquing the studs which will lead to eventual failure and it's a loss of valve lift from the get go.