Order Status & Returns
Gift Cards
Help Center
1-800-345-4545
Product Discontinued
Currently Unavailable
This product is no longer available. Please call customer service for assistance at 1-800-345-4545.
Big Block Chevy
Stud Girdle Kit1965-2000 Big Block Chevy 396-454ci 7/16 in.-20 Stud Thread Clamp-On Style 6061-T6 Billet Aluminum Purple Anodized FinishIncludes:
- (16) Polylock Nuts
66981 Features:
- Stabilizes the valvetrain and rocker arms from flexing
- Retains critical valve lift and timing
- Delivers consistent high-RPM performance
Consistent RPM Performance for Your Valvetrain
Proform Stud Girdles feature high-quality aluminum construction for weight savings and strength. They reduce valvetrain flex thus eliminating the possibility of stress damage or failure. In addition, stud girdles improve rigidity and help minimize energy and horsepower loss. Each kit includes aluminum stabilizers and poly locks.
Part TypeRocker Arm Stud Girdle
Product LineProform Aluminum Stud Girdles
BrandPROFORM
Package Height3.5
Package Width11.0
Package Length20.5
Weight10.4 PG
Part CategoryPerformance Parts
Stud Girdle FinishPurple Anodized
Stud Girdle MaterialBillet Aluminum
Stud Girdle Attachment StyleClamp-on
Rocker Arm Nuts IncludedYes
Rocker Arm Nut Thread Size (In.)7/16-20
Rocker Arm Nut StylePolylock
QuantitySold as set of 2
Cylinder Head Style (Application)Chevy Big Block
Part FitmentSemi Universal
Vendor Part Number66981
Package Qty1
Package TypeEA
No Questions
No Reviews
Items You Need
![Engine Assembly Lube [4 oz. Bottle]](https://www.jegs.com/images/mini_200/500/555/555-28000.jpg)
JEGS
Premium 10-Blade Feeler Gauge Kit 0.015 in. to 0.035 in. (0.381mm to 0.889mm)
Part Number : 555-80502
$1777$20.99
You Save$3.22
![Penetrating Oil [11 oz. Aerosol Can]](https://www.jegs.com/images/mini_200/600/639/639-11043.jpg)
![Brake and Parts Cleaner [14 oz. Aerosol Can]](https://www.jegs.com/images/mini_200/500/555/555-72312.jpg)
![Black RTV, Temperature Resistant up to 625 Degrees F [3.8 oz. Tube]](https://www.jegs.com/images/mini_200/500/555/555-28035.jpg)
JEGS
Black RTV, Temperature Resistant up to 625 Degrees F [3.8 oz. Tube]
Part Number : 555-28035
$799$8.99
You Save$1.00
![Fender Cover with Pocket [23 in. W x 31 1/2 in. L]](https://www.jegs.com/images/mini_200/500/555/555-65010.jpg)
JEGS
Fender Cover with Pocket [23 in. W x 31 1/2 in. L]
Part Number : 555-65010
$1499$16.99
You Save$2.00
![Valve Spring Compressor [Stud Mount]](https://www.jegs.com/images/mini_200/500/555/555-80518.jpg)
![Valve Spring Compressor [Stud Mount]](https://www.jegs.com/images/mini_200/500/555/555-80521.jpg)
![W89409 Valve Spring Compressor [C-Style]](https://www.jegs.com/images/mini_200/500/555/555-w89409.jpg)
![1/2 in. Drive Torque Wrench [10 to 150 ft. lbs.]](https://www.jegs.com/images/mini_200/500/555/555-m200db.jpg)
JEGS
1/2 in. Drive Torque Wrench [10 to 150 ft. lbs.]
Part Number : 555-M200DB
$5239$56.99
You Save$4.60
![Heavy-Duty Nitrile Gloves [7 mils Thick, Large]](https://www.jegs.com/images/mini_200/500/555/555-1124.jpg)
JEGS
Part Number : 555-80502
$1777$20.99
You Save$3.22
Some parts are not legal for use in California or other states with similar laws / regulations
