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7 bolt arp reg studs

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slanTeyeZ

Probationary Member
10
0
Jul 17, 2005
San Diego, California
what are the limitations of the 7bolt 11mm studs? i know the 12mm 6bolts have held 35+. ALSO REG ARPS NOT L19s
 
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I ran regular 11mm's for a long time into the higher boost levels than they were effective to. I never had an issue with them torqued to 100ft/lbs and boost levels up to 40psi or so. When I ran my setup into the 42-49psi range I ended up stretching the 8740 ones. I have ran the same set of L19 11mm studs after that on a fresh head after I floated some valves and redid the valvetrain, for 4 years at boost levels over 50psi max. The setup was never below 30psi from 2008-2012. I am changing the studs and cylinder head now as they are stretched out and the head seats are crushed and elongated.
 
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