10 or 11mm

[whyteboy]

im about to order some headstuds for my kat my block is going to the machine shop tuesday i was going to get 11mm arp headstuds but i was told i have to get my block machined to accept these so are they 1mm longer or 1mm wider or should i just get the 10mm im gonna be pushing over 400 with my setup thanks for the help and yes i searched

[H8tred]

Wider. They would have to drill the current threads smooth, and tap it for the 11mm studs.

[whyteboy]

so i m guessing i need to do my head also that would make sense thanks if i use the 10mm is there a limit on these do i have to worry about my head lifting under high boost

[480sx]

You dont have to do anything to your head, you just have to get the right tap and dye and use it accordingly.

As long as your not going 500+ hp your fine with 10mm.

[whyteboy]

kool guys thanks for the help

[H8tred]

Thanks for picking up the ball 480, I've been busy as hell, and haven't had a chance to follow up. I myself intend to do mine at 11mm before I get the machine work done on my block. I have a t3/t4 at the moment, but I'm building so all I will need to do is change external parts to make more power.