head bolt thread size

njord · Post by **njord** » Tue Oct 13, 2015 1:37 am

Does anybody know the thread size oh the head bolts as finding conflicting info

It's either m12 x 1.25 or m12 x 1.25 as arp studs are tight going in so want to clean threads

Post by **4thgenphil** » Tue Oct 13, 2015 7:57 am

Have u put the grease on them?

farlow · Post by **farlow** » Tue Oct 13, 2015 9:29 am

njord wrote:Does anybody know the thread size oh the head bolts as finding conflicting info

It's either m12 x 1.25 or m12 x 1.25 as arp studs are tight going in so want to clean threads

Based on that info I'd go with m12 x 1.25

Post by **Drax** » Tue Oct 13, 2015 10:02 am

farlow wrote:
njord wrote:Does anybody know the thread size oh the head bolts as finding conflicting info

It's either m12 x 1.25 or m12 x 1.25 as arp studs are tight going in so want to clean threads
Based on that info I'd go with m12 x 1.25

I noticed that too.

@njord I can check tonight if you like? I have lots of spare head studs at home

Post by **Drax** » Wed Oct 14, 2015 10:28 am

@njord took this pic this morning

one is the head bolt and one is the main stud bolt methinks, but both were 10mm diameter threads.

njord · Post by **njord** » Wed Oct 14, 2015 10:12 pm

I managed to get a bolt and it is definitely m12 x 1.25

There was quiet abit of swarf down there. Guess the machine shop didnt do quite a good enough job