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ARP Head Studs?

Russco

By Russco,
in Engines & Forced Induction

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Merli Grand Master

Merli

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Posted

Yep...

It was 12mm on the block side, and 12.7mm into the head if I remember correctly... Had to re-tap the head to fit them...

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wrxhoon Grand Master

wrxhoon

Posted
Posted
Yep...

It was 12mm on the block side, and 12.7mm into the head if I remember correctly... Had to re-tap the head to fit them...

i'm sure you didnt have to re-tap the cil head , i think you'll find out that you had to drill the holes out a little so the bolts fit , as they dont screw in to the head , they screw in the block

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  • 9 months later...
proengines Rising Star

proengines

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yeah this is right, dont know why but they made them over sized, would like to know the theory behind this, seeing as the part that screws into the block is standard size.....

You might find they are 1/2" unf on the top but taken down to 12mm to screw into the block. I'm 99% sure the SR20 studs also use an imperial thread on the top of them. It saves making a different nut especially for them.

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