Proform - 66755
Each PROFORM Grade 8 Header Bolt is permanently assembled with a pair of special washers. When the bolt is torqued to 28+ ft-lbs, the washers super-hardened external teeth bite into and grip the bottom of the bolt head and the top surface of the header. After being self-locked in this manner, any bolt-loosening rotation is blocked by a wedge-locking action created by the washers interfacing, matching cams. Its an uphill climb: vibration that might ordinarily loosen the bolt actually increases the wedge-locking tension, securing the bolt even more. Because this simple wedge-locking method uses tension instead of friction, contact with oil actually facilitates the wedge effect. When changing headers, PROFORM Header Bolts can be untightened with a normal wrench, lubricated, and reused. Sold as a set.
Product Details:
- Engine Header Bolts
- Wedge-Locking Technology
- Hex Head Type
- 8mm x 1.25 x 1.181Inch Long
- Shiny Nickel Plated Finish
- 12 Pcs in kit
- Fits GM LS Engines With 3/8 Inch Wide Flange
- Sold As A Set
Year
Make
Model
Submodel
Engine
2009
Chevrolet
Avalanche
Base
5.3L
2009
Chevrolet
Avalanche
LS
5.3L
2009
Chevrolet
Avalanche
LT
5.3L
2009
Chevrolet
Avalanche
LT
6.0L
2009
Chevrolet
Avalanche
LTZ
5.3L
2009
Chevrolet
Avalanche
LTZ
6.0L
1997
Chevrolet
C1500
Base
5.7L
1997 - 1998
Chevrolet
C1500
Cheyenne
5.7L
1999
Chevrolet
C1500
LS
5.7L
1997 - 1998
Chevrolet
C1500
Silverado
5.7L
1997 - 1998
Chevrolet
C1500
WT
5.7L
1997 - 1999
Chevrolet
C1500 Suburban
Base
5.7L
1997 - 1999
Chevrolet
C1500 Suburban
LS
5.7L
1997, 1999
Chevrolet
C1500 Suburban
LT
5.7L
1997 - 1999
Chevrolet
C2500
400 SS
5.7L
1999
Chevrolet
C2500
Austera
5.7L
1997 - 2000
Chevrolet
C2500
Base
5.7L
1997 - 1999
Chevrolet
C2500
Cheyenne
5.7L
1997 - 1999
Chevrolet
C2500
Custom
5.7L
1999 - 2000
Chevrolet
C2500
LS
5.7L
1997 - 1998
Chevrolet
C2500
Silverado
5.7L
1998
Chevrolet
C2500
WT
5.7L
1997 - 1999
Chevrolet
C2500 Suburban
Base
5.7L
1997 - 1999
Chevrolet
C2500 Suburban
LS
5.7L
1997
Chevrolet
C2500 Suburban
LT
5.7L
1997 - 1998
Chevrolet
C35
Base
5.7L
1997 - 1999
Chevrolet
C35
Cheyenne
5.7L
1999 - 2000
Chevrolet
C35
Custom
5.7L
1997 - 2000
Chevrolet
C35
Heavy Duty
5.7L
1997 - 1998
Chevrolet
C35
Tipico
5.7L
1997, 1999 - 2000
Chevrolet
C3500
Base
5.7L
1997 - 1998
Chevrolet
C3500
Cheyenne
5.7L
1999 - 2000
Chevrolet
C3500
LS
5.7L
1997 - 1998
Chevrolet
C3500
Silverado
5.7L
1997 - 2000
Chevrolet
Camaro
Z28
5.7L
1998 - 2000
Chevrolet
Camaro
Z28 SS
5.7L
1997 - 2000
Chevrolet
Cargo Van
Base
5.7L
2009
Chevrolet
Cheyenne
Base
5.3L
2009
Chevrolet
Colorado
LT
5.3L
1997 - 2000
Chevrolet
Corvette
Base
5.7L
2009
Chevrolet
Corvette
Base
6.2L
1998
Chevrolet
Corvette
Indianapolis 500 Pace Car
5.7L
2009
Chevrolet
Corvette
Z06
7.0L
2009
Chevrolet
Corvette
ZR1
6.2L
2009
Chevrolet
Express 1500
Base
5.3L
1997 - 2000
Chevrolet
Express 1500
Base
5.7L
2009
Chevrolet
Express 1500
LS
5.3L
1997 - 2000
Chevrolet
Express 1500
LS
5.7L
2009
Chevrolet
Express 1500
LT
5.3L
2009
Chevrolet
Express 2500
Base
4.8L
1997 - 2000
Chevrolet
Express 2500
Base
5.7L
2009
Chevrolet
Express 2500
Base
6.0L
1997 - 2000
Chevrolet
Express 2500
LS
5.7L
2009
Chevrolet
Express 2500
LS
6.0L
2009
Chevrolet
Express 2500
LT
6.0L
2009
Chevrolet
Express 3500
Base
4.8L
1997 - 2000
Chevrolet
Express 3500
Base
5.7L
2009
Chevrolet
Express 3500
Base
6.0L
1997 - 2000
Chevrolet
Express 3500
LS
5.7L
2009
Chevrolet
Express 3500
LS
6.0L
2009
Chevrolet
Express 3500
LT
6.0L
2009
Chevrolet
Express 4500
Base
6.0L
2009
Chevrolet
Express Cargo
Base
5.3L
2009
Chevrolet
Express Pasajeros
Base
5.3L
2009
Chevrolet
Express Pasajeros
Base
6.0L
2009
Chevrolet
Impala
SS
5.3L
1997
Chevrolet
K1500
Base
5.7L
1997 - 1998
Chevrolet
K1500
Cheyenne
5.7L
1999
Chevrolet
K1500
LS
5.7L
1997 - 1998
Chevrolet
K1500
Silverado
5.7L
1997 - 1998
Chevrolet
K1500
WT
5.7L
1997 - 1999
Chevrolet
K1500 Suburban
Base
5.7L
1997 - 1999
Chevrolet
K1500 Suburban
LS
5.7L
1997, 1999
Chevrolet
K1500 Suburban
LT
5.7L
1997, 1999 - 2000
Chevrolet
K2500
Base
5.7L
1997 - 1998
Chevrolet
K2500
Cheyenne
5.7L
1999 - 2000
Chevrolet
K2500
LS
5.7L
1997 - 1998
Chevrolet
K2500
Silverado
5.7L
1998
Chevrolet
K2500
WT
5.7L
1997 - 1999
Chevrolet
K2500 Suburban
Base
5.7L
1997 - 1999
Chevrolet
K2500 Suburban
LS
5.7L
1997
Chevrolet
K2500 Suburban
LT
5.7L
1997, 1999 - 2000
Chevrolet
K3500
Base
5.7L
1997 - 1998
Chevrolet
K3500
Cheyenne
5.7L
1999 - 2000
Chevrolet
K3500
LS
5.7L
1997 - 1998
Chevrolet
K3500
Silverado
5.7L
1999 - 2000
Chevrolet
L30
Base
5.7L
1997 - 2000
Chevrolet
P30
Base
5.7L
1998 - 1999
Chevrolet
Silverado
LS
5.7L
1998 - 1999
Chevrolet
Silverado
LT
5.7L
1998
Chevrolet
Silverado
LX
5.7L
1997
Chevrolet
Silverado
SLE
5.7L
1997
Chevrolet
Silverado
SLT
5.7L
1997
Chevrolet
Silverado
SLX
5.7L
1999 - 2000
Chevrolet
Silverado 1500
Base
4.8L
1999 - 2000
Chevrolet
Silverado 1500
Base
5.3L
2009
Chevrolet
Silverado 1500
Hybrid
6.0L
1999 - 2000, 2009
Chevrolet
Silverado 1500
LS
4.8L
1999 - 2000
Chevrolet
Silverado 1500
LS
5.3L
1999 - 2000, 2009
Chevrolet
Silverado 1500
LT
4.8L
1999 - 2000, 2009
Chevrolet
Silverado 1500
LT
5.3L
2009
Chevrolet
Silverado 1500
LT
6.0L
2009
Chevrolet
Silverado 1500
LTZ
5.3L
2009
Chevrolet
Silverado 1500
LTZ
6.0L
2009
Chevrolet
Silverado 1500
LTZ
6.2L
2009
Chevrolet
Silverado 1500
WT
4.8L
2009
Chevrolet
Silverado 1500
WT
5.3L
2000
Chevrolet
Silverado 2500
400 SS
5.7L
2009
Chevrolet
Silverado 2500
Base
4.8L
1999 - 2000, 2009
Chevrolet
Silverado 2500
Base
5.3L
1999 - 2000
Chevrolet
Silverado 2500
Base
6.0L
2000
Chevrolet
Silverado 2500
Cheyenne
5.7L
2000
Chevrolet
Silverado 2500
Custom
5.7L
1999 - 2000
Chevrolet
Silverado 2500
LS
5.3L
1999 - 2000
Chevrolet
Silverado 2500
LS
6.0L
1999 - 2000
Chevrolet
Silverado 2500
LT
5.3L
1999 - 2000
Chevrolet
Silverado 2500
LT
6.0L
2009
Chevrolet
Silverado 2500 HD
LT
6.0L
2009
Chevrolet
Silverado 2500 HD
LTZ
6.0L
2009
Chevrolet
Silverado 2500 HD
WT
6.0L
2009
Chevrolet
Silverado 3500
Base
6.0L
2009
Chevrolet
Silverado 3500 HD
LT
6.0L
2009
Chevrolet
Silverado 3500 HD
LTZ
6.0L
2009
Chevrolet
Silverado 3500 HD
WT
6.0L
2000
Chevrolet
Sonora
Base
5.7L
2000
Chevrolet
Sonora
LS
5.7L
2000
Chevrolet
Sonora
LT
5.7L
2000, 2009
Chevrolet
Suburban 1500
Base
5.3L
2000
Chevrolet
Suburban 1500
Base
5.7L
2000, 2009
Chevrolet
Suburban 1500
LS
5.3L
1998 - 2000
Chevrolet
Suburban 1500
LS
5.7L
2000, 2009
Chevrolet
Suburban 1500
LT
5.3L
1998 - 2000
Chevrolet
Suburban 1500
LT
5.7L
2009
Chevrolet
Suburban 1500
LT
6.0L
2009
Chevrolet
Suburban 1500
LTZ
5.3L
2009
Chevrolet
Suburban 1500
LTZ
6.0L
1998
Chevrolet
Suburban 1500
LX
5.7L
1997
Chevrolet
Suburban 1500
SLE
5.7L
1997
Chevrolet
Suburban 1500
SLT
5.7L
1997
Chevrolet
Suburban 1500
SLX
5.7L
2000, 2009
Chevrolet
Suburban 2500
Base
6.0L
2000, 2009
Chevrolet
Suburban 2500
LS
6.0L
2000, 2009
Chevrolet
Suburban 2500
LT
6.0L
2000
Chevrolet
Tahoe
Base
4.8L
2000, 2009
Chevrolet
Tahoe
Base
5.3L
1997 - 1999
Chevrolet
Tahoe
Base
5.7L
2009
Chevrolet
Tahoe
Hybrid
6.0L
2000
Chevrolet
Tahoe
Limited
5.7L
2000, 2009
Chevrolet
Tahoe
LS
4.8L
2000, 2009
Chevrolet
Tahoe
LS
5.3L
1997 - 1999
Chevrolet
Tahoe
LS
5.7L
2000
Chevrolet
Tahoe
LT
4.8L
2000, 2009
Chevrolet
Tahoe
LT
5.3L
1997 - 1999
Chevrolet
Tahoe
LT
5.7L
2009
Chevrolet
Tahoe
LTZ
5.3L
2009
Chevrolet
Tahoe
LTZ
6.2L
2009
Chevrolet
Tahoe
PPV
5.3L
2009
Chevrolet
Tahoe
Z71
5.3L
2000
Chevrolet
Tahoe
Z71
5.7L
2009
Chevrolet
Trailblazer
SS
6.0L
1997 - 2000
Chevrolet
W3500 Tiltmaster
W3S042
5.7L
2009
Chevrolet
W3500 Tiltmaster
W3S042
6.0L
1997 - 2000
Chevrolet
W4500 Tiltmaster
W4S042
5.7L
2009
Chevrolet
W4500 Tiltmaster
W4S042
6.0L
