ThumpnZ28

iTrader: (23)

Finally got the car on the dyno yesterday after the new engine was broken in.

LQ4 block, 4.030 bore
Diamond -2cc pistons
Eagle 6.100 rods
stock GM crank
ported FAST 90
PRC 5.3 heads
11.5:1
Car has a TDP T56, 9 inch and 4.30 gears.
Car made 462/412 in 73° weather.
Ditching the y pipe and cutout for duals and dumps in hopes of getting that extra power to the ground. No dyno sheet at the moment. Any comments or opinions welcome.

Tainted

iTrader: (9)

good numbers, whats the cam specs

ThumpnZ28

iTrader: (23)

Cam is pretty small. 24x/24x on a 112.

Tainted

iTrader: (9)

Not exactly "pretty small"

ThumpnZ28

iTrader: (23)

I should have gone bigger. Car should shine with the 200+ shot it was built for. Going TH350 in the spring.

TA6spdRDC

iTrader: (2)

#s seem low. If you have a 3" cut out its killing you.

ThumpnZ28

iTrader: (23)

Numbers are low??? I didn't think so. I gained 100 horses and almost 90 lbft from the ls1 with an MS3 cam. And while dyno #'s are cool to talk about, I'm more concerned about e/T's.

TA6spdRDC

iTrader: (2)

I have almost the same motor set up as you except i have stock milled 243s and my car put down 424/417 through a 4l80 and a 9". I picked up 27lbs of torque ditching the 3" cutout.

Jimbo1367

yeah... small cam

ThumpnZ28

iTrader: (23)

I'm ditching the cutout, y pipe, and going to bigger headers. Should get me a little more.

Tainted

iTrader: (9)

You should consider an xpipe, or if you are y pipe destined, then get a good merge collector like magnaflow or flow master. It would make a significant difference especially with 1 7/8ths

ThumpnZ28

iTrader: (23)

X pipe is already sitting in my garage. Going to stepped headers and a 3 1/2" collector.

StreetSilverado

iTrader: (17)

Different set of heads would help greatly. Not saying they're bad, just not good for your setup.

ThumpnZ28

iTrader: (23)

I agree completely on the heads. I was thinking about the PRC 237's next year. I'm going to run this setup this coming season and see what all I can get out of it first.

StreetSilverado

iTrader: (17)

Those would definitely be better! My old 370CI with LS6 heads made 494RWHP/467RWTQ through an A4, they have real good potential. Also ran 10.70s NA and 9.90s on a 150 shot....and like an idiot I sold it before I got to spray it to the ground like it was built for!

Tainted

iTrader: (9)

im going to be running the prc aftermarket ls3 heads on my 408. Pretty sure Im gonna nail 525+ pretty easily

ThumpnZ28

iTrader: (23)

Its a process. Trial an error, and improvement over time. I plan on changing to a single plane intake too at some point. Just trying to get all I can out of 370 inches before I have to upgrade.

silverz28camaro

iTrader: (20)

Thats almost the same numbers my 6.0 put down :-)

silverz28camaro

iTrader: (20)

What y-pipe do you have ?

I think I could have gained more power, but dyno looks like I was getting valve float...Springs had alot of time on them and have seen 8,000 rpms several tims

check these y-pipe results out

https://ls1tech.com/forums/generatio...er-y-pipe.html

I8UR4RD

iTrader: (16)

great results. would love to see a direct port nitrous kit put on it with a progressive controller from Neil @ nitrous outlet. Car is going 9's no doubt. Have an exhaust shop make you up a 3 inch TD exhaust.