Need help with LQ4 6.0 combo options
#1
Need help with LQ4 6.0 combo options
Hi. Doing a LS swap into a 1981 G body 2dr malibu. Already have the eng(2001 LQ4 6.0 complete with computer and harness). rear end is built with auburn posi,4.10 gears,moser axles,and c-clip eliminators, have turbo 400 trans with street/strip rebuild,and am going with 2800-3000 stall. I plan on staying with stock short block as far as pistons,crank/stroke etc. would like to keep 317 casting heads due to bigger valves but chambers are 72cc instead of 68 or 64cc. couple of my questions are.... can I mill heads down to increase compression for that block as long as lift isn't too high. Plan on using LS2 stg 2 cam with .551 lift and 224-230 duration @.050. Second question is on intake. Can I get any respectable HP out of OE truck intake if it's ported/cleaned up or should I just replace,even if I use ported throttle body? I read somewhere they're good for mid range torque but not high rpm HP. Will most likely end up with 100-150hp nitrous plate on this eng to get around 600hp and in 10 sec range. Any suggestions much appreciated
#3
TECH Fanatic
iTrader: (5)
Give it some time
Figure somewhere around 1cc per .006 removed. If your budget allows it, a set of 243/799 and those milled would be a better way to go. If you can get around state smog requirements increasing compression is a good inexpensive way to increase torque, makes a bigger camshaft more streetable. LS6 intake or better is worth the money, truck intakes are overrated and present hood clearance issues although they look cool when they are sculpted smooth.
#5
TECH Fanatic
The OE truck intake is not ideal in my experience. My motor fell flat at 4k RPMs with it. I replaced it with a ported LSXRT (properly tuned) and gained everywhere, especially above 4k.
#6
Thanks. I'm gonna try out the Professional Products Typhoon manifold,throttle body and fuel rail combo I found. The $$ is right and with a LS6 or ZO6 cam and 100hp shot it should work well. Next is getting parts for TH400 to fit behind it along with crossmember