Carb Guru Eric Jackson talks carburetor myths beginning with the Holley Power Valve.

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  • When I first bolted up my 528 Hemi on the dyno I was running a set of 850 Carter Thermoquad on a Weiand tunnel ram. The first pull was down on power from what I expected. Looking at the data it showed it was a bit rich so it opened the secondary air doors .050. The next pull the motor picked up 60 hp. So being greedy I opened them another .050 and promtly lost the same 60hp. I quickly discovered small changes can SOMETIMES lead to big hp changes.