5.7 lm7 rx7 or rx6.0l

[TS87FC3S]

ok so basically i have my car ready to recieve engine, and my trans bought th400. I just cant decide what engine, im looking for 400-450 whp na plus spray.

I can get a lm7 that needs rebuilt for free, or a high mileage running LQ4 for 600 bucks. Basically which one will be cheaper to build for my hp goal, im on a budget (daughter on the way budget).. also might want to make slightly more power later (this is in a 2300lb car so prolly never anymore then around 550 whp)

[djmtsu]

Is this going into your FB??

I guess that radiator I bought is going towards the build?

[TS87FC3S]

Originally Posted by djmtsu

Is this going into your FB??

I guess that radiator I bought is going towards the build?

yes this is going in the fb i popped the 12a and for what its gonna take to build it to then numbers i want it was too expensive and risky, so its getting a v8 and slicks lol

[dregg100]

lm7 is a 5.3. if power is your goal go with the bigger displacement lq4. even with that, they only make like 325 hp stock(and thats brand new condition). you are gonna have to spend some coin to make those WHP goals

[FC3S Murray]

Yeah the LQ4 is your better bet being the bigger cubic inch, just punch it, stroke it and slap some ported OEM heads and an aggressive cam and you will be at 590hp on the motor easy. But dgregg is right....it takes a lot of cash to make that kind of N/A power to the wheels out of a 5.7L let alone a 5.3. Hell my LS1 would take another 3k(includes tuning and what not) to get to 500rwhp and I am making 425rwhp right now.

500 is doable but very expensive and has to be spec'ed right or else the motor wont hold up long. Now going Forced Induction is a whole other story. Boost makes these motors smile...so does spray

[FC3S Murray]

Here is a guy with a LQ9 in his C5 vette. Those PRC heads are garbage too, if you went with AFR's you would make more power

Had my car tuned down in Tampa a week or so ago here is the numbers and some pics let me know what you think!

Was super hot out over 100* so when its cooler out i think i can pick up a lil more, given its already corrected but we all know thats always off when cooler outside

Specs
Car- 99 frc corvette torch red
motor-lq9 6.0 bored and stroked to 408ci
texas giant cam 248/254
prc stage 3 heads
callies dragon slayer crank
callies rods
diamond -2cc pistons
fast 102/ nw102 throttle body
ls2 fuel rails
42lb injectors
custom made air intake by me with ls7 maf
monster stage 4 clutch
BILSTEIN suspension