by EuroHummer » Mon Dec 07, 2009 11:45 am
Look into a 408...just bore it 0.30 over, buy a K1 4.00 stroker crank, K1 6.125 rods, and Wiseco pistons. Slap in a good cam and DR timing set, do a good valve job and there you go. A torquer motor on a budget. All internals can be found at
www.wiseco.comYou can get several nice cams, to include GM factory high performance cams to put out power in the rpm range you want.
You can stick with the factory TB, intake and MAF sensor. It has been recommended by many people who are in the know not to change to an aftermarket MAF. All you get is bad idle, maybe a lean condition and not much, if any HP.
I even have a BBK 80mm TB brand new that I did not use that I would sell cheap. I went to a 90mm LS7 TB at the end.
That stock iron block and aluminum heads are great for what you talking about. You will have to have the pistons milled to get the compression ration down to 10 to 1 or so, depends on the gas you are using.
Have the PCM tuned by Nelson Performance after you decide on all the parts you are going to be using. Don't do like me and keep sending it back because you keep upgrading parts.
Headers and exhaust will set you back 2000 or so (good long tubes like Dynamaxx or Kooks).
I have part numbers and prices if you want a list.
2003 H2, 408 cubes, Dynatech headers, high flow cats, magnaflow exhaust, FAST LSXRT 102mm intake, LS7 90mm TB, Nelson Performance Tuning, Schneider cam (.552 lift, 266 dura.,114 lsa), K1 4.00 Stroke Crank/6.125 con rods, .030 over Wiseco X Series pistons,10.5 to 1 comp., FAST injectors, SA Gear Double Roller Timing set, Comp Pro Magnum Rockers/push rods/studs, MSD Coils/plug wires, CK Performance built 4L65E, Fabtech 6" lift, 37x12.5x20 Nitto Grapplers, JJ 20x9 Black Widows, E&G flares.