Header bolt size (to engine block)
Racer
Joined: Jan 2009
Posts: 352
Likes: 0
From: Wichita Kansas
I dont want to turn this into a stud vs. bolt thread. But if are starting over just get the studs(ARP 434-1301), much better IMO. I can expain why they are better but just my 2 cents. If not it is a M8 diameter by I believe 1.75". 
Thread Starter
Burning Brakes
Joined: Oct 2013
Posts: 859
Likes: 1
Thanks I appreciate it!!
By all means, please do explain. I'll be dropping the headers and replacing the gaskets this weekend
By all means, please do explain. I'll be dropping the headers and replacing the gaskets this weekend
Racer
Joined: Jan 2009
Posts: 352
Likes: 0
From: Wichita Kansas
By all means I am no rocket scientist so take this as my opinion, BUT- whenever you use a bolt in the head you are putting ALL of the stress and pressure on the head itself (threads of course) as you are bolting into the head. Whereas when you utilize a stud- you screw the stud into the head (by hand) and you are putting ALL of the pressure on the studs as you are screwing the nut into the bolt itself. On top of the torsion strengths yada yada, it makes it easier to thread the studs in, hang the gaskets, and install headers. Now it would be cheaper to just buy bolts or reuse bolts, BUT I figure if you are there might as well do it right, and if you are using expensive heads(like I am) whats an extra 30 bucks?
Thread Starter
Burning Brakes
Joined: Oct 2013
Posts: 859
Likes: 1
By all means I am no rocket scientist so take this as my opinion, BUT- whenever you use a bolt in the head you are putting ALL of the stress and pressure on the head itself (threads of course) as you are bolting into the head. Whereas when you utilize a stud- you screw the stud into the head (by hand) and you are putting ALL of the pressure on the studs as you are screwing the nut into the bolt itself. On top of the torsion strengths yada yada, it makes it easier to thread the studs in, hang the gaskets, and install headers. Now it would be cheaper to just buy bolts or reuse bolts, BUT I figure if you are there might as well do it right, and if you are using expensive heads(like I am) whats an extra 30 bucks?
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