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Message: <blockquote data-quote="2broke2gofast" data-source="post: 540865" data-attributes="member: 9677">About 8months ago I accidentally shifted from 3rd to 2nd at high rpms and warpped some exhaust valves on my afr 165's. After tearing into the car, and letting it sit for a few months I decided to do a complete rebuild. I let a reputable builder in the are port and polish the heads, replaced valves, guides, and all that. He also took the block .030 over and installed a set of flat top d.s.s flat top pistons. Decided to take .030 off the heads for compression and put it back together.Before the build up I was running a stock cam with the out of the box afr's and the trick flow street intake. with a tune made 262rwhp and 286tq on a mustang dyno. Now, after the build and about 700 miles of break in, I returned to the same dyno, on a cooler day, with the ported and polished heads, same trick flow street intake, new lunati 51014 cam...This round I made 256rwhp (6hp less than berfore) and 301tq.The tuner says the intake is a likely culprit, but I don't see gaining 30+ rwhp with an intake.Suggestions, thoughts, comments?</blockquote>