Heads/cam swap results
Thread Starter
12 Second Club
Joined: Dec 2017
Posts: 1,034
Likes: 224
From: San Antonio
Heads/cam swap results 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
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
Last edited by Utinator; Sep 15, 2018 at 02:36 PM.
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.
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.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo Thread Starter
12 Second Club
Joined: Dec 2017
Posts: 1,034
Likes: 224
From: San Antonio
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.
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 Enthusiast
Joined: Nov 2016
Posts: 711
Likes: 6
From: PNW
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.
TECH Apprentice
Joined: Nov 2001
Posts: 376
Likes: 3
From: Gary, In
TECH Fanatic
Joined: Jan 2017
Posts: 1,758
Likes: 442
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.
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.
Teching In
Joined: Feb 2014
Posts: 48
Likes: 1
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
Last edited by 00pooterSS; Sep 19, 2018 at 05:08 PM.
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.
A well designed Y pipe will perform just as well as any exhaust on an LS1 at this power level. As for header primary sizes, I’m not sure. I think you could benefit differently from all sizes depending on what you are trying to do with your setup.