Utinator

I just finished the heads/cam swap on my 2000 Camaro. Any guesses on what it made on the dyno?

Here's my set-up:
SLP lid
LS6 intake
317 heads ported and milled to 66.5cc
TSP cam 224/228-114 (.600")
Kook's 1-7/8" headers
TSP 3" cat-back exhaust
4L80e
Circle-D 3200
stock 10-bolt (.323)

This should be it on the dyno: https://www.dropbox.com/sh/q7j9pavsn0jgu28/AAB6nyZJUKGTV-NIPkLPrFtOa?dl=0&preview=0914181626.mp4

HCI2000SS

iTrader: (2)

400 rwhp

Utinator

I wish it was that much. Remember, this is the "Slomaro" we are talking about. Here's a better video:

Utinator

z-maro

iTrader: (18)

Who ported the heads, was the converter locked, do you have numbers from before the swap?

99 Black Bird T/A

iTrader: (4)

385 whp would be my guess.

Unlocked 4L80e & 3200 stall is not going to be a dyno queen.

With 317 heads ported and milled to 66.5cc, I think that's close to stock compression, maybe a hair higher ~ 10.2 or so.

I bet the car will run pretty well at the track and stronger than the dyno suggests.

​​​​​I'm guessing that based on my 72 Vette that dyno'd 346 whp with a TH400 & Yank 3200 stall that's spanked several 400+ whp cars.

Utinator

A local guy hand ported the heads. The converter was locked, and this is the first time this car has ever seen a dyno.

Bspeck82

Numbers Sound about right to me. Good job.

8.Lug

Utinator

I have the Kooks catted-Y pipe, and TSP's 3" cat-back w/cut-out. I leave the cut-out closed/blocked, because that's how I drive it on the street. I have opened the cut-out at the track before, and it didn't help.

I have read before that some of these LS1 engines are just stronger than others. That's why I call this car the "Slomaro". Obviously, it has a weaker engine.

tech@WS6store

iTrader: (2)

Thats why its hit or miss with hand port.
Id expect 400 really.

8.Lug

You need to ditch that Y pipe. It's time for a real exhaust.

8.Lug

I think I'm just now starting to realize why everyone thinks they need 1-7/8's headers to make moderate power levels - it's because you guys are still trying to squeeze all of your exhaust through a Y-pipe.

Dano 00TA

Yep, that's my next step. I'd think it'd help me somewhat.

Utinator

The catted Y-pipe is the only way to pass inspections. Without it, the car is worthless.

Bspeck82

Wow the issue isn't the y pipe...Issue is the 317 head. They have 71cc Chambers meaning Low compression. This means a poorer burn and less volumetric efficiency/dynamic compression across the board. They also don't flow any better than an ls1 head. It's effectively a downgrade for non boosted motors. A set of 243s bone stock would probably gain a few horses up top and cnc port polish valve job bowl blend and mill on the 243s would provide large gains all over.

Even if they are milled to 65cc (and that's IF THEY ARE) THEY STILL DONT FLOW AS WELL AS 243S. They are truck heads made for low end torque for towing.

Rocks00Z28

Do you live in northern Va? I have no problems getting my car inspected with a catless Y. In my part of Va it is just a visual inspection and they usually do not look or care.

00pooterSS

iTrader: (40)

Do they put a sniffer in the tail pipe or do they hook up to the OBD II port to do the inspection? Unless they put a sniffer in the pipe you don't need cats. I passed for years without them and I had a F body when there was one on every corner, and all those guys passed without them too. Plus if you're a tuner and know what you're doing you can get one to pass a sniffer too without cats. I used to do it with my hondas when we had sniffer tests, back before OBD II

And man, I'd go mill the stock heads down to around 60 cc and put them back on or go with 243's like Bspeck suggested, those heads are doing you no favors it looks like

z-maro

iTrader: (18)

317s should flow right with the 243/799s, they just have bigger combustion chambers and lower compression as mentioned. However if milled to the same cc as 241s they should outperform them all day. Take Advanced Inductions for example, they run their same CNC program options on the 317s, 234s, and 799s, they can't do that with the 241s. And they can weld up the chambers on the 317s to up the compression.

poltergeist 02

iTrader: (65)