how long are the top header bolts (stock)

[buickbert]

i dont have any to reference and need to know. does anyone have any just sittin around that they could measure the length and what size it is where it bolts into the head. i need this info so i can call arp and get the right size header studs for the top 3 studs on my headers. the ones in the header stud kit wont fit cause they arent long enough to clear the collar that the stock/ poston headers have, at least thats what ive been told.

buickbert

 

[pitoturbo]

bolts lenth

top headers bolts 3/8-16 x 1.75in,long, lower bolt 3/8-16 x 1.00in long

 

[buickbert]

what size is 3/8-16?

buickbert

 

[pitoturbo]

what size is 3/8-16?

buickbert

3/8 thikness / 16 thred 1.75 long 1 3/4