Not Ranked
KC didn't say they are bad, just that they were more expensive. ET publishes their flow numbers for their port of both, and the Blue Thunder is better, especially at higher lifts. It also appears to have a more pronouced peanut chamber with the plug more decisively angled toward the exhaust. The one of the two FEs running at the last EMC used the BT head. A 505, I believe it made 750hp, and averaged 610lbf-ft of torque from 2500-6500 rpm.
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