GiggleJuiced_SS

iTrader: (31)

so im making my list of mods for spring and i wanna do some minor head work for this year. my friend has a set of 5.3 heads i could buy for cheap. so my question is, do i mill/port either the 5.3 heads or my ls1 heads? i wanna bump the compression up to atleast 11 to 1 or at most 11.5 to 1. which would work better. im gonna get a ls6 intake, full exhaust (lt, true duals, no cats), and run 4.10 gears. i have a lid and k&n right now.

01ssreda4

iTrader: (96)

Keep your LS1 heads...

wildcamaro

iTrader: (15)

if you want to increae compression as well as flow do yourself a favo and get some ls6 heads...

if you dont wanna do that, then stick with the ls1 heads...they have bigger valves than the 5.3 heads,

the 5.3 heads are only worth it if you upgrade the valves and get them cnc ported

GiggleJuiced_SS

iTrader: (31)

ok, sounds like im keeping the ls1 heads. maybe ill look for some ls6 heads along with an intake at the same time. any idea what hp/tq increase id be lookin at just swapping to ls6 heads? ill probably port and mill them but just some sort of idea?

2000MaroonZ28

iTrader: (1)

What about ported 5.3 heads vs. stock ls1?
http://sdparts.reachlocal.com/?scid=..._id=5873201138
They're cheaper than the ls6 ported, but what's the hp number comparison?

bww3588

iTrader: (49)

Unless your adding a cam, increasing your compression will not get you gains your looking for. Do your bolt on's and leave the heads alone until you get a cam.

01ssreda4

iTrader: (96)

Have you looked into the high compression CNC program A.I. has for LS1 (241, 853) heads?

NemeSS

iTrader: (127)

If you plan on spending any money on heads, do yourself a favor and get the best performers you can afford. Or just have your stock heads milled and get a custom grind cam. Might as well get a custom grind with all the supporting parts. Have the person spec your supporting parts for cam. Instead of trying to mix and match off the shelf items and guessing.

Rise of the Phoenix

iTrader: (27)

Have A.I. CC the 5.3 heads. A guy by the name of "PharmD" (I think) made more power with the A.I. 5.3 heads than he did with Performance Induction 215 heads. He did back to back dyno's of both combos for a baseline.