Stock TPI Intake Bolt Length?
06-19-2012, 10:53 AM
#1
Le Mans Master
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2023 C5 of the Year Finalist - Modified
2022 C5 of the Year Finalist - Modified
St. Jude Donor '09-'10-'11
Stock TPI Intake Bolt Length?
Does anyone know the stock length for tpi intake bolts? Specifically the 4 outermost corners. I bought an ARP SBC intake bolt kit but I dont know if they will work on the 4 corners since the threads in the 113 head are recessed a bit. I would like to compare the stock bolt length to the ARPs before I open the package.
06-19-2012, 12:23 PM
#2
Le Mans Master
If the outer holes are countersunk, you have a '91 or current production 113's. Those recesses are for gasket retainers to maintain perfect alignment during assembly (which was suppose to stop chronic intake leaks). Anyway, GM said that they were going to need (and use) a longer bolt on these holes to maintain correct torque, but as far as I know, they only used them at the Factory and everything else just uses the standard length because nothing else is available.
06-19-2012, 12:57 PM
#3
Le Mans Master
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2023 C5 of the Year Finalist - Modified
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The heads are from my '90.
I can get a 5 pack of bolts the right length from ARP for the 4 corner bolts, but I want to see how far off of the stock ones the ARPs in the kit are.
I can get a 5 pack of bolts the right length from ARP for the 4 corner bolts, but I want to see how far off of the stock ones the ARPs in the kit are.