These grade 8 alloy steel, longer length bolts are designed to compensate for thread length lost when using head bolt washers. This allows increased torque and clamping. Set of 16 does one cylinder head.
Vehicle Fitment:
The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.
| Make |
Model |
Years |
Engine |
Fitment Notes |
| Chevrolet |
Corvette |
1966 |
7.0L / 427 / V8 |
ULTRA SEAL; CYLINDER HEAD BOLTS; LONGER THAN STOCK; 16 BOLTS FOR ONE HEAD; |
| Chevrolet |
Corvette |
1967 |
7.0L / 427 / V8 |
ULTRA SEAL; CYLINDER HEAD BOLTS; LONGER THAN STOCK; 16 BOLTS FOR ONE HEAD; |
| Chevrolet |
Corvette |
1968 |
7.0L / 427 / V8 |
ULTRA SEAL; CYLINDER HEAD BOLTS; LONGER THAN STOCK; 16 BOLTS FOR ONE HEAD; |
| Chevrolet |
Corvette |
1969 |
7.0L / 427 / V8 |
ULTRA SEAL; CYLINDER HEAD BOLTS; LONGER THAN STOCK; 16 BOLTS FOR ONE HEAD; |
| Chevrolet |
Corvette |
1970 |
7.4L / 454 / V8 |
ULTRA SEAL; CYLINDER HEAD BOLTS; LONGER THAN STOCK; 16 BOLTS FOR ONE HEAD; |
| Chevrolet |
Corvette |
1971 |
7.4L / 454 / V8 |
ULTRA SEAL; CYLINDER HEAD BOLTS; LONGER THAN STOCK; 16 BOLTS FOR ONE HEAD; |
| Chevrolet |
Corvette |
1972 |
7.4L / 454 / V8 |
ULTRA SEAL; CYLINDER HEAD BOLTS; LONGER THAN STOCK; 16 BOLTS FOR ONE HEAD; |
| Chevrolet |
Corvette |
1973 |
7.4L / 454 / V8 |
ULTRA SEAL; CYLINDER HEAD BOLTS; LONGER THAN STOCK; 16 BOLTS FOR ONE HEAD; |
| Chevrolet |
Corvette |
1974 |
7.4L / 454 / V8 |
ULTRA SEAL; CYLINDER HEAD BOLTS; LONGER THAN STOCK; 16 BOLTS FOR ONE HEAD; |
