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WildBillyT · 10-13-2006, 09:15 AM

Definitely sounds like an exhaust leak to me. Did you go back and re-torque the header bolts a few hours after the initial torque, and then the initial run?

Did you check your exhaust manifold/header flange for trueness?

10-13-2006, 09:15 AM	#6
WildBillyT Ayatollah of Rock N Rolla / Admin Join Date: Mar 2006 Location: Parts Unknown Posts: 12,573 iTrader: (10)	Definitely sounds like an exhaust leak to me. Did you go back and re-torque the header bolts a few hours after the initial torque, and then the initial run? Did you check your exhaust manifold/header flange for trueness? __________________ -Bill '68 Nova SS: Vortec 350 6 spd 4.11 9" DSE 4wdisc