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1/2" ARP Head Studs

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dexterholland04

15+ Year Contributor
754
108
Jan 1, 2007
Rush, New York
What you would need:

(10) ARPAR4.400-1LB (Studs)
(1 pk) ARP200-8534 (Washers)
(1 pk) ARP300-8334 (Nuts)

This is what I bought - you can get it all from Summit for about $120.

Your machinist would need to tap the block out to 1/2-13 in. threads, or use time certs (or equivalent). I think I remember my machinist doing the necessary work for well under $50. These are a cheap insurance policy for running big boost!
 
How much stronger are the 8740 molly 1/2" studs compared to the 12mm h11/l19? Whats the better upgrade from 11mm?
 
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