blacknightSS

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!

NAVYBLUE210

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

1989GTA

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.

blacknightSS

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.

Sales@Tick

iTrader: (3)

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.

blacknightSS

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

02BLK/BLKZ

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

trevmust

i was always told that the GM LS3 hotcam or whatever its called is more than adequate...

427 zeo6

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!

BOLO

iTrader: (40)

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.

Sales@Tick

iTrader: (3)

Although I agree that a Hotcam is not really optimal for a 4" stroke LS3 headed engine, we've had good results with the GMPP 480hp crate engine in a customers 2006 GTO.

That particular GTO with a GMPP LS3 480hp engine made 450/435 to the tires on our Dyno Jet.

handyandy496

iTrader: (9)

Great to hear. How much more hp stock vs ported from AI?

trevmust

what oil pan should I use? the website says the stock pan wont clear a stroker, (I'm building from scratch)