LS3 416 stroker n/a build
Thread Starter
Registered User
Joined: Aug 2014
Posts: 11
Likes: 1
From: El Paso, TX
LS3 416 stroker n/a build hey guys im new to the forum and all but just wanted to bounce what i plan on doing and seeing what people think. ok so im planning on rebuilding my block and stroking it with TSP's 416/418 rotating assembly with the compstar crank and compstar h-beam rods. Wiesco 4.07" bore -3 cc flat tops. also plan on getting GMPP ls3 cnc'd heads. i am keeping the current cam i have now as well as valves and pushrods.
current cam is Comp Cam:
valve lift: .620 intake/.612 exhaust
dur @ tappet lift: 285 intake/293 exhaust
dur @ lobe lift: 235 intake/244 exhaust
LSA: 112.0
i have dual valve spring and hardened pushrods already so dont see a reason to replace them. i am currently making 481 wrhp and 432 wrtq. is it unreasonable to expect to get to 550wrhp with a calculated 11.2:1 compression ratio with this build? thanks for any input guys!
current cam is Comp Cam:
valve lift: .620 intake/.612 exhaust
dur @ tappet lift: 285 intake/293 exhaust
dur @ lobe lift: 235 intake/244 exhaust
LSA: 112.0
i have dual valve spring and hardened pushrods already so dont see a reason to replace them. i am currently making 481 wrhp and 432 wrtq. is it unreasonable to expect to get to 550wrhp with a calculated 11.2:1 compression ratio with this build? thanks for any input guys!
TECH Fanatic
Joined: Aug 2009
Posts: 1,845
Likes: 255
From: Coast of San Mateo County Between Pacifica & HMB
FAST102/102TB?
17/8 LTS?
cam may be a hair small, especially exhaust duration others with more expertise will
Chime in, should have killer response on street.
What is your goal / Intended application?
Also that trick ram-air Martin has should be worth 2-3 tenths &
2-3 mph on your build easily.
Good Luck
17/8 LTS?
cam may be a hair small, especially exhaust duration others with more expertise will
Chime in, should have killer response on street.
What is your goal / Intended application?
Also that trick ram-air Martin has should be worth 2-3 tenths &
2-3 mph on your build easily.
Good Luck
TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
Camshaft is too small for that kind of power. I don't see all that much of an increase in horsepower but a nice increase in torque. You might get 500rwhp and maybe 490 on the torque. Sounds like a good build that will be a fun combination of the street.
Last edited by 1989GTA; Aug 4, 2014 at 11:48 AM.
Thread Starter
Registered User
Joined: Aug 2014
Posts: 11
Likes: 1
From: El Paso, TX
navy- i dont have the fast 102 or 102 TB, if i can find a used one for a good deal i plan on getting it but otherwise plan on using stock intake and TB. i do have 1 7/8" long tubes.
overall goal is to build a forged n/a motor for about a year and during that year i want to get much heavier into track instead of drag strip, that way i can give myself an honest assessment of how i want to complete my build whether going track or strip directed. now with the n/a build i still will be going to the strip with it but my main goal is to build something that is pretty good at both and that way i can determine which route to go. and if i decide FI all i have to do is change the pistons out which is cheap to lower CR and then the rest of the supporting mods but the forging of the engine is already complete.
overall goal is to build a forged n/a motor for about a year and during that year i want to get much heavier into track instead of drag strip, that way i can give myself an honest assessment of how i want to complete my build whether going track or strip directed. now with the n/a build i still will be going to the strip with it but my main goal is to build something that is pretty good at both and that way i can determine which route to go. and if i decide FI all i have to do is change the pistons out which is cheap to lower CR and then the rest of the supporting mods but the forging of the engine is already complete.
We've always made the same or more power on the LS3 stuff with the stock intake manifold.
I did have a LS3 manifold ported one time by AI that did really well. All of the out of the box LS3 Fast intake results I've seen were not impressive in the least bit.
I did have a LS3 manifold ported one time by AI that did really well. All of the out of the box LS3 Fast intake results I've seen were not impressive in the least bit.
Thread Starter
Registered User
Joined: Aug 2014
Posts: 11
Likes: 1
From: El Paso, TX
i personally dont see the benefit for over $1500 for fast 102 + 102 TB. in terms of HP per cost. would much rather spend that money towards cnc'd heads. now if money wasnt an issue and i was building an all out build then yea
Teching In
Joined: Aug 2008
Posts: 12
Likes: 0
From: Pearland, Tx.
blacknightSS, I just completed my 416 build with stock LS3 heads, NW 92mm TB, gm 85mm MAF, BER ported LS3 intake manifold and a mild custom cam (10.5 deg overlap) from Tick I made 501/474. My compression was a bit higher at 11.8:1. I also run a catted y pipe and single 3" exhaust with a cutout in the I-pipe. G-Force tuned the car and their dyno has always been pretty accurate when I compare trap speed to RWHP. As you can see the HP was not the big change but the torque was really pumped up by the stroker. I am merely offering up this information as it may help you with some of your decisions during your build. I also agree with 1989GTA, you will need more cam to achieve 550rwhp. As for custom cams I obviously recommend Martin@Tick as I am very satisfied with the way my car drives (it is my daily driver).
Justin
Justin
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On The Tree
Joined: Mar 2012
Posts: 131
Likes: 2
LS3 HOT cam? then why does GM rate this at 480HP when installed into their crate motor......there are many other grinds I would use before intalling one of these underperformers! I would talk to Texas Speed, TEA cylinder heads or Rher Morrison about doing CNC to existing cylinder heads if you have them or go with Trick Flow heads over the GMPP CNC heads!
I'm in the process of building a 13.5:1 416 LS3 n/a build as well. I just picked up my new short block at Speed Inc. Waited a few months, but well worth the wait. Brian Tooley will be doing my top end combo.
LS3 HOT cam? then why does GM rate this at 480HP when installed into their crate motor......there are many other grinds I would use before intalling one of these underperformers! I would talk to Texas Speed, TEA cylinder heads or Rher Morrison about doing CNC to existing cylinder heads if you have them or go with Trick Flow heads over the GMPP CNC heads!
That particular GTO with a GMPP LS3 480hp engine made 450/435 to the tires on our Dyno Jet.
Great to hear. How much more hp stock vs ported from AI?
