StealthFormula

iTrader: (35)

Anybody know what size header bolts we use on our cars? I want to get some bolts with an allen head so I can tighten them down better and get rid of my leak caused by my loose bolts.

Gabbiani

iTrader: (20)

3/8 16 threads 1" long

StealthFormula

iTrader: (35)

^great thanks!
the ones Im looking at are 3/8 16 threads but says .750 in. underhead length is that ok or does the underhead length need to be 1in., I the .750 is an inch counting the head?

Gabbiani

iTrader: (20)

.75 will work - I used them for years NA. When I switched to my turbo setup I had several pull the threads out from the weight, heat, flexing, etc.

I would recommend going 1" because the hole is deep enough for them - More threads will hold better and be more likely to not strip.

mtperformance

iTrader: (7)

Why not get some Stage8 locker bolts?

BTC

Personally, I would not use 3/4" bolts. I would get 1" bolts. If you're looking for locking bolts, I think there are better alternatives than Stage 8. Percy's is now making what used to be Breslin Split Locks.

Gabbiani

iTrader: (20)

The bolts are good, but I have never been able to use the locking clips. Every set of headers I tried they wouldn't fit. The split lock ones do well if you want to spend the coin for them.

I just ordered some plain ARP 1" bolts to put back in my setup.

Paul Bell

iTrader: (9)

https://ls1tech.com/forums/showpost....45&postcount=6

StealthFormula

iTrader: (35)

^^
thanks for the link I was able to find some 1in allen heads at the spectre website and just ordered them.