Intake runner bolt sizes and specifications
Thread Starter
3rd Gear
Joined: May 2023
Posts: 3
Likes: 2
Intake runner bolt sizes and specifications
I have not been able to find the bolt specifications for the runners on my 1990 C4 L98 so I decided to make them available.
Pan head torx T40 black oxide
Hardness 10.9
Head diameter 15.30mm
11- M8-1.25 x 30mm
2- M8-1.25 x 35mm (upper end of runners on the bottom)
2- M8-1.12 x 40mm (inside)
4- M8-1.25 x 55mm (lower end of runners on the bottom)
I do not understand why a company like ARP does not sell these replacement bolts. I saw a used set on Ebay for $154.00
Pan head torx T40 black oxide
Hardness 10.9
Head diameter 15.30mm
11- M8-1.25 x 30mm
2- M8-1.25 x 35mm (upper end of runners on the bottom)
2- M8-1.12 x 40mm (inside)
4- M8-1.25 x 55mm (lower end of runners on the bottom)
I do not understand why a company like ARP does not sell these replacement bolts. I saw a used set on Ebay for $154.00
Thread Starter
3rd Gear
Joined: May 2023
Posts: 3
Likes: 2
Below is the corrected information.
Pan head torx T40 black oxide
Hardness 10.9
Head diameter 15.30mm
11- M8-1.25 x 30mm
1- M8-1.25 x 30mm stud (for throttle cable bracket)
2- M8-1.25 x 35mm (upper end of runners on the bottom)
2- M8-1.25 x 40mm (inside)
4- M8-1.25 x 55mm (lower end of runners on the bottom)
Pan head torx T40 black oxide
Hardness 10.9
Head diameter 15.30mm
11- M8-1.25 x 30mm
1- M8-1.25 x 30mm stud (for throttle cable bracket)
2- M8-1.25 x 35mm (upper end of runners on the bottom)
2- M8-1.25 x 40mm (inside)
4- M8-1.25 x 55mm (lower end of runners on the bottom)
