pdd

iTrader: (3)

looks nice bro-good luck with it

VortechC5

iTrader: (6)

Like everyone else I am really looking forward to seeing the difference that the ported L92s provide.

Thanks for posting the pictures. The picture of the offset rockers is the first that I have seen.

WKMCD

iTrader: (2)

Ed didn't finish it until late and didn't get any tuning in - long day. We'll get some numbers up in the morning.

FRDnemesis

iTrader: (19)

Following this post has been like watching the TV Series "24". Just when you get on the edge of your seat.................... its, "stay tuned" for the next episode

Ryne @ CMS

iTrader: (10)

so i guess if we were using tfs 225's we would be making more power.....

SideStep

WKMCD

iTrader: (2)

Final results:

Overall, I'm pretty happy with the numbers for a baby cam "Gentleman's Cruiser". The torque curve remained pretty much as before so the car will remain a blast to drive. Richard at WCCH really feels that the intake is now the limiting factor on this setup. He's probably right. Someone really needs to come out with a cost effective street manifold that will keep up with the setup.

Ed and I are talking about another cam option this morning and we'll see what develops.

First Setup/Final Numbers:



Head swap only:

SideStep

Good deal... good numbers... and most of all good technical information for the community! Have you driven the car on the street yet??? (roads are finally drying-up in N VA...)

At what RPM did you make peak HP, TQ???

WKMCD

iTrader: (2)

Thanks. This is a very mild build and should be a great driver. You know what it's like on 66 during rush hour.

I haven't driven the car yet but we're picking it up Saturday so the 180 mile drive back should be fun. I'll post up some impressions after I drive it.

I think Ed will post up here soon with more info.

edcmat-l1

iTrader: (10)

I think some of the offset in power numbers can be attributed to dropping the compression slightly. I still would have liked to have seen more gains from the heads. I guess that says good things about them as they come from GM?
Anyways, I think there is room for improvement. Maybe do another cam swap? We'll keep everyone posted......

cybernco

Hey, you guys are heros in my book. Thank you for sharing the much needed testing. I really look forward to learning more about this set up and can't wait to hear of the results with your next cam.

I've only got 76 miles on my new engine & look forward to posting my dyno results after my break-in is finished.

Patrick G

iTrader: (14)

Great writeup. Hey Ed, did the new heads allow you to crank up the timing any more than the other heads? Just wondering if there was any hidden power with additional timing. Nice power gains by the way.

santiago

iTrader: (28)

at least wve got some numbers to go off of now

Richard@WCCH

iTrader: (3)

Nice job Kevin and Ed. I appreciate all your hard work and patience. This build definitely highlights the challenges in improving by large percentages the factory finished part and that cam selection is important. It's difficult to strike the right balance between making a high rwhp number and having an easy driving engine. I applaude your pioneering spirit and thank you for sharing this with the Tech community. I'd like to see your impression of the car's low speed cruising manners after you put some miles on it.


Richard

FYI I'm gathering up some flow data on the CNC ported L92 heads and a stock L76 intake and will post up in another thread.

Brian Tooley Racing

iTrader: (13)

The lowest power number I have seen from a 402/TFS 225 is 540 RWHP, so I guess you are correct. Looks like Vengeance just posted up another one.

https://ls1tech.com/forums/dynamometer-results-comparisons/667223-vengeance-racing-402-iron-block-tfs-heads-results-inside.html

Don't forget the TFS 225's have made over 500 RHWP in Ca. on a stock LS2 shortblock.

I am done hijacking your thread, but if you would like to throw a set of TFS 225's on that thing give me a call.

White_Hawk

iTrader: (3)

I don't think anyone is arguing with you that TFS is better. It is all about cheapness:

--> L92 Heads + L76 Intake + Springs = $1200 (or $1600 if you need a TB)

--> TFS heads + Fast 90 = $3200 (or $3600 if you need a throttle body)

Either way, it is $2000 cheaper. It is a great alternative for people going big cube but don't want to drop the big bucks on the heads and FAST intake setup. I think that there is always going to be a market for ported LS6 heads and aftermarket cathedral castings too.

-Geoff

WKMCD

iTrader: (2)

It really wasn't about cheapness or creating a max build. It was more about doing something interesting.

edcmat-l1

iTrader: (10)

I think the fact that these are GM parts found on stock vehicles (heads/intake) that the numbers are respectable. Not stellar, but respectable.
The fact that the CNC heads had minimal gain, again, can be viewed two totally different ways. The CNC work doesnt gain much, or are the heads that good from GM?
I'm trying to talk Kevin into changing the cam AGAIN.
Now that we know EXACTLY what the springs can take, we could go a little bigger on the lift.
And to answer Patricks question, yes I could get another 2 degrees of timing in, but it just barely pulls about a degree back out around 2200 to 3500/4000. So thats almost a wash. I'll take at least a degree out of most of the whole table before it leaves. It pretty aggresive, just trying to get the max numbers.

FRDnemesis

iTrader: (19)

That is true and if someone is content leaving them box stock, it does seem to be the bang for the buck.

But if you pay for a ported set from TEA/Livernois/TSP/WWCH to get the I/E ratio where it needs to be, you'll have another $1,100 wrapped up in the heads and then someone like vengeance to port match the intake $125, now the $1,600 has turned into $2,900. Then your faced with the decision I was faced with which was for another 600. you can have TFS/Fast90/90 and KNOW what the outcome is going to be, not to mention, picking a cam for the TFS combo seems to not be a black art, like with the L92's.

I'm going L92's anyway but not a stock set.

1bigcam

iTrader: (9)

when is some one going to put a real big cam in one of these set ups. waiting to see what kind of power is gained.