Carb advise
 

Can anyone tell me the difference between the regular Holley 4150 650 double pumper compared to the HP series? The cost is alot more and was wondering if there is that much performance gain or is it just more adjustable or what? Any suggestions to which one would be right for my combo? You can see my combo at http://www.louisianamustangs.com I'm doing away with the fuel injection because of ongoing trouble shooting.

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1989 LX Coupe, N/A 306. Pro-M 77mm,70mm T.body,Edelbrock RPM intake,TrickFlow heads,Crane cam,Eagle rods,10.1 pistons,Hooker long tubes,MSD 6-AL,C-4 W/3800 stall,4.11 gears,SSM's 12.33 @ 110 mph. Car is still being dialed in. Pictures and info on my webpage. (LA Mustangs) http://www.louisianamustangs.com

I wondered that too. I think they do a little extra machining of the internals to make it flow a little better. I'd pick the Demon series carbs over an HP series though. Those things sound like they mean business.

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1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s