can anyone tell me what size the nut is on the arp headsteads so i can go to store and get the socket

 

14mm 12pt encase anyone was wondering

 

Stcok headbolts (which are highly recommended over arp) are that size also.

 

^whats wrong with arp ive used them on every honda project ive had without one issue....

 

They dont have the clamping force of a stock headbolt on the S2000 engine, and its a fact I've proven 9 years ago.

 

The Real Street S2K is trapping close to 150mph on an unopened engine. I think I would leave everything stock in the engine for just about any application.

 

i never knew that..... i was getting ready to order arp studs for my ap2, since i went turbo months back, fig would hold better then oem ones...ive used them in my h22,b16,b18c builds no issue figured same quality as them. so are the s2000 bolts like other hondas, when you take head off must use new oem head bolts?becuase of the stretch?

 

Stock head studs have been shown to hold 625hp without lifting. Probably more with the right HG.

 

They are tq to yield

 

so if you want 1000 hp what head studs do you recomend???