oscs

iTrader: (19)

ok so the car has a lq4 ls1 intake/ TB, sanderson headers and a TSP 228r cam, dual walboro pumps, adjustable FPR. It has great low end torque but feels like it just plain falls on it face after third gear... thinking its probably in the 350 rwhp range at the moment? looking for a solid 450RWHP.. so lets discuss the best/economical way to reach 450 RWHP and 500RWHP.

from what i gather l92 or ls3 heads and an ls6 intake should get me to 450rwhp.. will i need a larger TB to get there?

what is the most ecomical way to reach 500rwhp? not quite sure where to start to reach those numbers.

on a side note what ever happened to the weiand intake? did that ever get released and is it any good?

Tainted

iTrader: (9)

Dont get ls3 heads, im sure two dozen people will say the opposote, but do some real research and you decide on that.

It depends on your budget. For factory heads, some ported and milled ls6 heads and a fast intake would get you there.

Jimbo1367

I agree. Try TEA or AI CNC package with GM 243s. If money allows go AFR or TFS catheral portheads.

Forcepower

iTrader: (23)

What do you mean by best/economical? There are so many options and your gonna have tons of people telling you "you should do this". Do your research and choose an option that best fits your needs and budget. Good luck.

oscs

iTrader: (19)

I mean I want to hear from different people running different setups in the 450 and 500rwhp range..

pwirth

I also have a 6.0 lq4 in a 2007 Chevy 2500 truck I plan on pulling and installing in my 72 Buick Skylark, I want to change the stock manifold and install either a Port injection Holley manifold or maybe even a Fast manifold but I do not know if the heads are "square" or cathedral ports.
does anyone Know?
Phil

low2001gmc

iTrader: (148)

as with any build or project, it all comes down to money, your budget, your goals, etc.

ive had both lq4 with 243 cathedral port heads and lq9 with ls3 rectangular port heads and loved both. i prefer the ls3 headed combo i have now but to each their own.

oscs

iTrader: (19)

Care to say why you like one over the other?

Tainted

iTrader: (9)

Probably the cost lol l92 stuff is cheap

pwirth

Are you saying the LQ4 comes stock with cathedral heads?

Tainted

iTrader: (9)

LQ4 and LQ9 both have cathedral heads.

L92/L76/LS3 is the rectangle port stuff (and theres a few other designations also but I dont know them off the top of my head)

oscs

iTrader: (19)

Would a lq4/l92 heads and ls6 intake combo work?

Tainted

iTrader: (9)

no, gotta have the ls3/l92/l76 intake. youre in luck, they can be had for $300 complete with fuel rails and injectors, plus they flow hella good compared to the ls6.

oscs

iTrader: (19)

So ls3/l92/l76 are all the same thing as far as intake is concerned? and what size injectors are they. I think I have acouple leaky injectors so I'm going to be in the market soon.

lemons12

iTrader: (71)

You mean budget? Without nitrous, there isn't one... Period.
I agree.. I wouldn't want an lq4 (dished pistons) and an l92 top end (huge valves that hurt bottom end, at least more than a cathedral setup). I don't know the CR but it can't be anything desirable.

For all intensive purposes, yes. They flow the same and fit the same heads.

An l92 (truck intake) will not fit. l76 or ls3 is what you will be looking for.

Tainted, you left out the ly6 (alum. 6.0 with l92 top end).. Not sure what else.

oscs

iTrader: (19)

Ok thanks for the education fellas, keep the comments coming. I do have spare set of 317 heads in the garage. Would it be wise to have someone Cnc port them/build them as apposed to going with with l92 heads? If l92 heads are not desirable for the low CP lq4 what is a good option?

Tainted

iTrader: (9)

You can either find some LS6 243/799 castings and have them worked over, or fork out the dough for some aftermarket heads.

Also als3 injectors I believe are 39lb

oscs

iTrader: (19)

So scrap the 317's pick up a pair of 243's get some light porting done. Throw on an ls3 intake/injectors/fuel rail and call it a day? 450rwhp setup?

Tainted

iTrader: (9)

the 243/799 wont work with ls3 intake, you would need an ls6 or FAST. you can easily hit the 450rwhp with cathedral heads and intake and be very happy.

oscs

iTrader: (19)

Ok thanks! Would it be smart to go ahead and pickup up the ls6 fuel rail and injectors? Will the ls1 throttle body and fuel rail work with the ls6 intake? If so jut upgrade injectors? Or should I just pick up the entire setup?