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Message: [QUOTE="KCTurbos, post: 1110767, member: 13852"] Yes sir it was hissing. I have narrowed it down to an exhaust valve. I was still running stock valve springs so I am guessing that a valve kissed the piston... The weirdest part of the whole things is that the miss was intermittent??? Here is the ghetto leak test that I did that showed where the hissing was coming from. [url]https://www.youtube.com/watch?v=rR6qw80SVJk&list=UUoKpxoPYQfFYZjgyA1kOsPg[/url] What are the chances that the valve just barely "kissed" the piston and that all I need is a new head? I had plans to take the truck back to "near stock" levels in about 3 weeks and then build a rclb truck. I just had the motor out last year with all new seals, main and rod bearings, new heads, etc... Any chance I can throw on a new head without having to pull the motor and change out the piston? [/QUOTE]

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