critique my 370 build
critique my 370 build already started my expensive journey into the ls world. The motor is being swapped into my 1970 camaro. It recently had a 383 stroker that made 510 hp and a t56, it was fun but not fast enough. now I have a t56 magnum and a lq9 shortblock....
the plan
boosted 370ci
stock crank
forged rods 6.125
forged pistons -11cc 9.2-1cr
arp mains heads rod bolts
prc l92 heads custom blower cam, stainless hollow valves.
fast 102 and 102 throttle body
65cc injectors
non intercooled vortech supercharger.
shooting for 700 at the tire on 93 gas only, car is 80% street and 20% strip. Should not have to run much boost being the motor will make majority of my power any hints or tips would be appreciated.
the plan
boosted 370ci
stock crank
forged rods 6.125
forged pistons -11cc 9.2-1cr
arp mains heads rod bolts
prc l92 heads custom blower cam, stainless hollow valves.
fast 102 and 102 throttle body
65cc injectors
non intercooled vortech supercharger.
shooting for 700 at the tire on 93 gas only, car is 80% street and 20% strip. Should not have to run much boost being the motor will make majority of my power any hints or tips would be appreciated.
Launching!
Joined: Jan 2011
Posts: 274
Likes: 1
From: Collierville, TN
- 700 RWHP on less than 10 psi may be a reach at 9.2:1 (I'm thinking 15 psi)
- There's a good chance you'll need more injector to hit that 700 number
- If your not going to intercool (you should) then methanol injection is almost a must (works particularly well with centrifugal blowers).
- I'd intercool and inject methanol.
- There's a good chance you'll need more injector to hit that 700 number
- If your not going to intercool (you should) then methanol injection is almost a must (works particularly well with centrifugal blowers).
- I'd intercool and inject methanol.
Last edited by FLYZNTN; Aug 16, 2015 at 10:02 AM.
Launching!
Joined: Apr 2005
Posts: 229
Likes: 3
From: Frisco TX
As the others said, I wouldn't run the FAST and I would inter cool it. Your motor combo isn't going to be making the bulk of your power, you're looking at 470is rwhp on motor. The rest will have to come from boost and that's going to be 15 plus pounds esp with 9.2:1 comp.
I'd listen to the advice being given and do it right once
I'd listen to the advice being given and do it right once
Well what intake ? I thought fast was best on the market. This is my first Ls build and first boost build. Is that compression to low for boost, I thought that would be ideal ? Bigger injectors ok.
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I think the compression ratio is ok as well, but in regards to your comment earlier about the motor making the majority of the power, the compression ratio doesn't help. It will help the engine be less finicky when it comes time to tune.
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Verdad Gallardo not sure if i want ls3 intake wouldent a bigger intake with bigger throttle body be beter?, bigger injectors, inner cooler, want to stay away from meth
Last edited by 973800CamaroRS; Aug 16, 2015 at 12:45 PM.
If you look at my build, you'll see that it's very similar to what you describe above (aside from our choice of forced induction method).
It kind of irritates me to hear multiple people recommend against using the FAST intake with forced induction, but that also matches up with what my engine builder (who specializes in LS engines) told me.
He also recommended against using the hollow-stem valves as they're more susceptible to breakage, which causes catastrophic damage to the piston/cylinder - he showed me a lower-end that had experienced that, & it was pretty ugly - no salvaging that block,
he said that he already had someone who was going to put a piece of glass on it for use as a coffee table. 
I'm guessing that your engine would probably make around 470 hp naturally-aspirated, so if you're shooting for 700 at the wheels, then you'll need to make 805 at the crank (assuming a 15% drivetrain loss) which is a difference of 335 hp. That's probably going to require more than 8-10 lbs of boost, I would think... (But hell, I've been wrong before...) 
Any particular reason you're opposed to the methanol injection?? That's one of the things that's definitely going to be a part of my build...
Good luck with your build.
It kind of irritates me to hear multiple people recommend against using the FAST intake with forced induction, but that also matches up with what my engine builder (who specializes in LS engines) told me.
He also recommended against using the hollow-stem valves as they're more susceptible to breakage, which causes catastrophic damage to the piston/cylinder - he showed me a lower-end that had experienced that, & it was pretty ugly - no salvaging that block,
he said that he already had someone who was going to put a piece of glass on it for use as a coffee table.
Should not have to run much boost being the motor will make majority of my power...
Any particular reason you're opposed to the methanol injection?? That's one of the things that's definitely going to be a part of my build...
Good luck with your build.
Save some cash and use the LS3 intake that's port matched to your heads. The fast isn't a huge leap over the LS3/7 like it is with the LS1/2/6. A FAST can take the boost you are looking at it's just not a good value upgrade.
Run an A2W intercoooler so you don't have to run big pipes. Check out frozenboost.com
Run an A2W intercoooler so you don't have to run big pipes. Check out frozenboost.com
TECH Enthusiast
Joined: May 2008
Posts: 537
Likes: 1
700 rwhp is going likely to break some drive train parts with a T56 - TH400 would be faster although not as much fun to drive.
Without an intercooler, consider upgrading to inconel exhaust valves, not a ton of cash but good insurance. As mentioned by others, some methanol would lower your risk of burning things up as boost is cranked up. Not sure you will get to 700 rwhp "without much boost"
Curious why you picked boosted LS as opposed to oversized BBC for a car you obviously dont want to cut up. 700 rwhp can be made NA with a 565 with HR cam and off the shelf parts.
Without an intercooler, consider upgrading to inconel exhaust valves, not a ton of cash but good insurance. As mentioned by others, some methanol would lower your risk of burning things up as boost is cranked up. Not sure you will get to 700 rwhp "without much boost"
Curious why you picked boosted LS as opposed to oversized BBC for a car you obviously dont want to cut up. 700 rwhp can be made NA with a 565 with HR cam and off the shelf parts.
Launching!
Joined: May 2013
Posts: 212
Likes: 0
From: Fairfax, VA
Any reason youre running a vortech setup over an LSA setup? Seems to me if you aren't interested in running the piping for the intercooler would be run the LSA roots style blower and use the provided fittings and make a heat exchanger setup. That way you can run a higher boost level and you wont have to add meth.
Also the 9.2 cr seems a little low. I would jump to at least a 10-10.5. Both being forged and not being a daily driver, the increased cr wont hurt (TUNING IS KEY). The higher the cr, the engine will make more power on its own, and once boosted won't need as much boost to achieve your goal.
Also, the FAST will take the boost, but it doesnt make sense to drop heavy money on that setup where the money could be used elsewhere to better your setup and make more power.
Also the 9.2 cr seems a little low. I would jump to at least a 10-10.5. Both being forged and not being a daily driver, the increased cr wont hurt (TUNING IS KEY). The higher the cr, the engine will make more power on its own, and once boosted won't need as much boost to achieve your goal.
Also, the FAST will take the boost, but it doesnt make sense to drop heavy money on that setup where the money could be used elsewhere to better your setup and make more power.