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Premium Member
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Discussion Starter #1
Can someone explain the use of a girdle (for the laymen) is it just for keeping alignment of the valvetrain? and IF it would be a good idea on a .638 lift solid flat tappet doing 6500rpm? (496 BBC) Ive got the Crane golds, just wondering if its added protection for them? or?
 

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Village Idiot
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The purpose of the stud girdle (the girdle that sits over the rockers) is to strengthen the individual rocker studs by clamping all the studs together (by way of the extra tall poly locks) and therefore spreading the strength between all the studs. In doing so you are able to avoid stud breakage which is bound to happen with some of the aggressive cams out there these days. There is a chance you may break the poly lock (which I have seen) so it is not a perfect system, just better with it than without it.

Paul
 

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I'm very happy with mine...and they were great to talk with too :))THumbsUp
Added benefit > they do a great gob of deflecting oil from the valve cove breather :)devil
 

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Discussion Starter #9
The purpose of the stud girdle (the girdle that sits over the rockers) is to strengthen the individual rocker studs by clamping all the studs together (by way of the extra tall poly locks) and therefore spreading the strength between all the studs. In doing so you are able to avoid stud breakage which is bound to happen with some of the aggressive cams out there these days. There is a chance you may break the poly lock (which I have seen) so it is not a perfect system, just better with it than without it.

Paul
Thanks Paul for that explanation, makes perfect sense now. Has stud breakage been a problem even when using ARP rocker stud replacements or mostly just stock configurations?

Any recommendations on which girdle to use for my application?; BBC, 990 heads, ARP studs, Crane gold rockers 1.7 and already have the tall covers....
 

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Flat tappets don't generally have stiff enough springs to cause stud failures. Stud flex is there, but not to the degree that is with a roller. RPM and the required springs to allow the RPM on a roller deal is hard on the studs. Look at the broken rocker thread. If you generating enough load to break a rocker, your generating more than enough load to flex the stud to the point of fatigue.

A flat tappet spinning 6500 doesn't require a stud girdle, but they never hurt either.



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Discussion Starter #11 (Edited)
Flat tappets don't generally have stiff enough springs to cause stud failures. Stud flex is there, but not to the degree that is with a roller. RPM and the required springs to allow the RPM on a roller deal is hard on the studs. Look at the broken rocker thread. If you generating enough load to break a rocker, your generating more than enough load to flex the stud to the point of fatigue.

A flat tappet spinning 6500 doesn't require a stud girdle, but they never hurt either.
Thanks Bob, I was reading that thread and is where I figured I would check this out.... The girdle seems like it is good insurance, are any types good to use or are some better than others??? Comp Cams (shown)m AFR, Howard, DART=$$$ ???
 

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Living in a cage of fear
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I haven't run anything with out stud girdles since the stock 427 in the purple flatty.
On the Miller 454 with Brodix heads I have the Brodix girdle, on the Hydro with Chevy iron heads I bought the Webster setup.
That Webster set is great
Simple and works.
 

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Thanks Bob, I was reading that thread and is where I figured I would check this out.... The girdle seems like it is good insurance, are any types good to use or are some better than others??? Comp Cams (shown)m AFR, Howard, DART=$$$ ???
I'm not a fan of the one piece deals like the Comp piece. With the splayed valve layout of the BBC, the one piece can be a pain to install and remove for valve adjustments. Not one of my favorite designs.

I like the Webster(who I believe makes Dart's).

LINK: Webster stud girdle

The Jomar like Hammerdown posted is a very good unit as well. It doesn't come with the adjusters, but Cstraub handles one of the best poly locks for girdle you can buy.
LINK: Jomar stud girdle



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MAD FABRICATOR
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girdles

Thanks Bob, I was reading that thread and is where I figured I would check this out.... The girdle seems like it is good insurance, are any types good to use or are some better than others??? Comp Cams (shown)m AFR, Howard, DART=$$$ ???
Are some better than others? I have run the comp cam ones you have pictured, They are fine, but,,,,,, I will mention that the two piece units are MUCH easier to work with when you are assembling and disassembling. the one piece design will not just "drop in place." they require some finesse due to to the angularity of the studs. Just my experience..
 

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Boat Nut
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X 3 on the Webster Girdle set up, fit is exellent, and easy to install. Note when switching to girdles or locks in general, use the end milled studs. The surface is flat, for positive no movement locking.
 

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Stud Rocker Arm Design

The Stud Rocker Arm Design has been a bad design :badidea: from GM since the 1950's.Cost was the driving factor not PERFORMANCE.
Adding a girdle is just a Band-aid to the problem.MOPAR had a better idea :idea: with their shaft rocker system on the early HEMI motors.
A design that is still used today in Top Fuel.
 
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