MikeWS6

People just get their hopes up when some post gains of 30+ hp.

lemons12

iTrader: (71)

10Rwhp over the entire graph.... Yes please!!!

I wouldn't be thinking 15Rw minimum with a 346 on just an intake swap... That is getting pretty high... 10-15Rw is what I would expect for a 102.

455GTO

iTrader: (18)

Ok thanks for your thoughts guys. I was just hoping for that magical 20whp number due to the intake being ported... But at the end of the day i have a damn strong ls1

thunderstruck507

iTrader: (18)

IIRC the porting they do is mostly just removing the bump in the runner and I'm not sure they take them apart. I could be wrong but it seems that was posted here with pics by someone who had it done.

If that's the case, it definitely seems on the lower side of right. If you had a setup that revved higher you would probably see higher gains but the ls6 should still be pretty efficient below 6500rpm.

455GTO

iTrader: (18)

Yes, that is indeed the case with not taking apart the manifold. Upon inspecting the port work, they go about 3-4" deep in each runner and appear to remove a "good" amount of material. As for the inlet, that appears to be heavily ported and goes almost halfway into the manifold itself...

Like I said, the work Vengeance did looks to be great, but I do think my "smallish" cam is holding back the potential of the heads/intake. Thinking about stepping up to the G5x3 on a 114lsa would really wake it up.

JakeFusion

iTrader: (7)

Phil said that because there wasn't a whole lot to be gained. I doubt the way Vengeance ports it would hurt power.

Anyway, I was looking at your mod list again, and I think I know why it didn't hit a higher peak gain. A better exhaust and a cam with more overlap would probably show more gains.

Remember, the whole thing is just a giant airpump. Being able to evacuate the exhaust in the overlap phase is where the gains come in at 6k+. Having an exhaust that can't keep up or a cam that doesn't have a tremendously long overlap cycle will cut down on the peak numbers. I think the Y-Pipe and 1-3/4" headers are hurting you there. The TV2 has decent overlap though, so that should support the FAST making bigger gains uptop.

455GTO

iTrader: (18)

You may be right, maybe some time down the road I will try the 1 7/8 headers with a cutout and see if it picks up any. But per my other thread, I'm really considering adding the meth injection to see what else can be had.

SteelCityYaga

Interesting because AI now offers porting of FAST Intakes.....

lemons12

iTrader: (71)

There is definitely power to be had in the exhaust.

PRE-Z06

Same results here...
http://forums.corvetteforum.com/perf...level-2-a.html

FWIW here's my results with swapping to 1.875" headers...
http://forums.corvetteforum.com/perf...s-results.html

MikeWS6

The whole header argument makes me laugh. Every month people switch their opinion on which is better.