1999vetteroo

iTrader: (15)

Here are my latest results. I'm very happy with what I have so far and I'm not finished yet. There have been alot of members saying that you don't need a cam with a wide split to make power with l92 heads, lets add another on to the list. The torque is what I'm most proud of.

Setup:
TSP 402ci
Stock l92 heads w/ PAC springs (milled to 63cc)
7.375 pushrods
Cometec gaskets (.30)
Dynatech longtubes w/ cats
L76 intake
Cam = VRX5 (236/238 112+4)
SCR = 11.5
DCR = 8.8


The before and after is from the 4 inch pipe mod that I copied from Kevin (WKMCD)




STD numbers were 507rwhp and 493rwtq and as you can see, I'm not done tuning. Big thanks to Ron, Kevin, Spin, Pat G and everyones esle who posts good info on this site!

Next up = 1 7/8 headers! anyone care to guess what I will gain?

8ByGoat

iTrader: (2)

I love the thread topic (see sig)

Congrats on the results.

Blacker

iTrader: (3)

Since the airbridge replacement, now it is lean at WOT. Looks like another round of tuning and you should be north of 500 rwhp.....easy

candyblueta

iTrader: (16)

WTF my 402 ls2 w/ ported l92's only put down 471

candyblueta

iTrader: (16)

maybe my cam is hurting me?????????
.... intake 228 ex. 232 @112 lsa.....

Heads flow 368cfm

Also im pulling Kpa's at higher rpm's on the dyno...
What king of intake setup are u running

Jakson

iTrader: (50)

A bigger cam will definitely help. You need to take advantage of the inches you have and the air your heads are moving. I would get something at least around a mid 240s intake duration. As long as you have a good tuner, driveability will still be fine being you have a 402. I'm sure a decent cam would put you well over the 500 mark.

To the OP, pretty nice numbers. Bet its fun on the street! I need to get to work on my 387ci build, 400 wheel isn't cutting it anymore, lol.

mike c.

iTrader: (1)

My 402ci,l92,l76 put down 517 468 with a wrong cam. I'm going to try patrick g's cam when the fast comes out for the l92's and see what I gain. Going to 1 7/8 I guess 15 hp more.

1999vetteroo

iTrader: (15)

Yes Sir!

1999vetteroo

iTrader: (15)

Check out the mod the Kevin (WKMCD) did a while back. It definitly works! 4inch pipe and a filter with a 4inch inlet...

awd2rwd

iTrader: (17)

Vetteroo what did your heads flow or do you know?

1999vetteroo

iTrader: (15)

They flowed 323cfm out of the box!

TACE02

UHHHHH, you think...lol. that is baby cam if I ever saw one, especially on a 4XX cube motor. Something in the 240ish Intake and Exhaust with 620ish type of lift would work wonders, I bet.

TACE02

To the OP, nice numbers... and yeah I too like how close your TQ is to your HP, very nice.

I also noticed you are running a CenterForce clutch??? How is that holding up, mine only lasted 6 months on a H/C setup (420/390)I had a few years ago, and maybe 20 total track passes and 3000 miles.

stoverz28

iTrader: (8)

Nice numbers man, 400+ rwtq at 3000 rpm has got to be fun as hell to drive.

Btw what part of town are you in? Ill have to be sure to steer clear lol.

1999vetteroo

iTrader: (15)

I've had the clutch for over 3 years and it's holding up fine. I do need to replace my clutch master though. Having issues shifting at high RPM!


[/QUOTE]
Nice numbers man, 400+ rwtq at 3000 rpm has got to be fun as hell to drive.

Btw what part of town are you in? Ill have to be sure to steer clear lol.
[/QUOTE]

I'm in North Austin.... But spend some time down in your neck of the woods (A.R.T.)!

Mikey 97Z M6

iTrader: (37)

Nice numbers man.

I don't know what my 387ci L92 head combo is putting down for horsepower, but judging from the trap speed, it's gotta be around 480+rwhp through a catted y-pipe and a restrictive exhaust. I'm running a wrong cam too I guess.

Mike

Damian

iTrader: (89)

That TQ curve is sick. Nice work with unported castings.

WKMCD

iTrader: (2)

Like this?

Please ignore the post about putting in a cam with mid 240's intake duration. You've done well so far listening to people who know WTF they're talking about.

Slowhawk

iTrader: (12)

Your making very nice power and I like the early peak which makes it a great DD setup.

As for Cam.It works very good and the 112+4 helps alot but I'm sure there is a Cam out there that would increase the power from 3k to 4.5k while extending the torque/hp to a higher rpm while not giving up anything over the existing Cam.This is ussually where the split comes in with a longer exhaust duration.

I'll go through my dyno graphs when I have time next week and show the Cam/power differences with a bigger split.

JS

iTrader: (4)

We tested 1 3/4 to 1 7/8 on a 402 and gained nothing...We were kinda pissed but we think once we port the Darts and go to a 3in exhaust will pickup more power..

Right now threw a TH400 were at 460/430 vs 510/520 threw the 6sp.