Goldhawg

iTrader: (7)

I've had a no go w/2 headers on my 71 Cutlass, and am considering just going w/a set of LS3 Camaro exhaust manifolds. Definitely easier, cheaper and long term friendly. I know its going to cost me power up top in a big way, and some across the curve. But I'm probably never going to be above 6k, and only infrequently going above 5k--my car is a driver. So, for those that went with exhaust manifolds, do you still grin with all the power or do you wish you'd went w/headers? My other option right now is BRP mid-length headers (hedman) and I haven't been able to find a report on these from somebody w/an abody. FYI, I have an LY6 w/Mast VVT cam.

Thoughts?

FatfreeGTO

You could ask this guy 67 goat dyno he made 391hp through a 6.0l with a cam and stock 98-02 manis.

Here is his build thread.
https://ls1tech.com/forums/conversio...-ls3-swap.html

fucter

iTrader: (5)

Headers are a right of hot ridding passage

tmcmillan5

iTrader: (1)

I went with the new TSP 1 3/4" headers.My engine setup is low and forward My F-body pan is about 1/2" above the x-member. The passengers side bolted up fine but it is tight at the back of the x member. The driverside not so good the # 1 tube hits the x member and needs to drop 3/4" in the rear for header bolts to line-up.
I had already planned for this so I dished-out by x member on both sides to allow for any more engine movement. The driver side collector does point outboard more than the passenger side and neither will align with the Trans stock cross members cut-outs but thats an easy fix.
These headers hang flush with the bottom of the Trans Pan and for 450 shipped I couldn't be happier but you need to be willing to do some mods to fit them in.

One more thing my TB SS stock manifolds fit fine, about 1/2" away from the framerails at the rather large flanges.

oh yeah 68 Chevelle

Tony

rotor vs. piston

iTrader: (3)

I'm using F-body manifolds and as I told my GF when I got home today, "I was in 2nd gear and punched it and screamed 'JEEEEEEEEESSSSSS' then I hit 3rd gear and screamed 'UUUUUUUUUUSSSSSSSS' and then laughed the rest of the way down the road.

I didn't and don't really plan on daily driving my swap, but have been that last few weeks and it already has a good enough power to weight ratio so I'll still likely not worry about headers down the road.

To be honest I'm thinking about redoing my exhaust w/ smaller pipes and mufflers. Currently running 2.5" from the manifolds to a single 3" the rest of the way. It's not very loud, but just a little more than I'd like for trying to stay under the radar.

V8Rumble

iTrader: (9)

THAT'S freakin' awesome...!!

I've been trying to decide whether or not it's worth it to use the F-body manifolds that I have - but it sounds like they'll be AT LEAST worthwhile enough to get the clutch broken in... (And hopefully by then I'll have been able to save enough to either build or buy a set of long-tubes...)

BanditDave

iTrader: (11)

Hey there...check out my build thread...restarting - LY6 with Lunati cam, LS3 intake, LS3 Camaro Manifolds.



http://i908.photobucket.com/albums/a...1/DSCN0254.jpg

They fit great and should have the car out shortly for some rompin'! Wanted to keep the column shift for the stealthy look...plus I planned to go boosted soon anyway. I wanted rock solid reliability out of this car.

Here's a start up with exhaust vid:



Let me know if you have any more questions!
Dave

Pop N Wood

iTrader: (1)

Stock exhaust manifolds for LS motors are not that bad. Unless you are running a ***** out motor I wouldn't worry about it if I were you. I have shorty pipes on my otherwise stock LS2 and it definitely gets me on down the road.

chasgiv3

iTrader: (1)

I'm using stock truck manifolds reversed so the end point forward. Good enough for for 965RWHP on the last dyno tune. A little bit more now with some small changes. Perhaps 975RWHP. Another thing I've seen folks do is to port them really well with some excellent results.

SUPERBOOST

iTrader: (11)

I have a 67 chevelle convertible with stock ls1 and 4l60e,its a cruiser with stock f body manifolds that fit like they were made for it.Dual dynomax turbo mufflers.Not loud at all,just enough to give that muscle car sound.Runs great and gets 25mpg on the road.Nothing wrong with manifolds especially on a driver/cruiser.

LS1 pwrd NOVA

iTrader: (2)

What do those midlengths headers you are thinking of getting look like?
I posted up some headers i tried and i tried a set of mid lengths and they didnt fit at all. I also dont know what brand they were.
I tried some some pace setter shortys for an fbody. The driver fits easy, passenger header hits the crossmember. I may use stock fbody manis or these pacesetters. Ill just have to cut & reweld one tube for a good fit.

99VetteFRC

I used truck maifolds and cut the flanges off an MIGed V-Bands on the ends. Works great and fits perfect. Will flip them when turbos go on. And I just used a couple of 2.5" U-bends and some straight pipe and connected them directly to the exhaust that was on the car with BBC and headers. LOVE IT!!!

Goldhawg

iTrader: (7)

I believe LS3 Camaro manifolds have 2.25in exit diameter and wondering about the transition into 2.5 in dual exhaust. Wondering if there is enough material to expand the manifold exit to 2.5in to immediately fit my exhaust?

FastKat

iTrader: (10)

I used a set of stock LS2 Corvette manifolds and I am 99% sure the outlet was 2.5", which if you really wanted to, would be plenty of pipe all the way back. I actually necked mine down to 2.25" after the catalytic converters... it's supposed to keep exhaust gas velocity up or something like that.

BanditDave

iTrader: (11)

If you get them like I did, they cut the manifold head pipe just in front of the cat so there was room to port it out to 2.5 and just butt weld the 2.5 pipe right up to it. I marked where the 2.5 would lay then ground a smooth transition to meet it. You can kind of see it in this view. I will take a better one when I get home.

Andy1

I'm running LS6 Vette cast headers on my LS1. They're a tri-Y design, 2 1/2" outlet, and support the 405HP LS6. Yeah, long tubes are nice, however these have factory heat shields and above all, are not prone to leak like tubing headers.

Andy1

Goldhawg

iTrader: (7)

But do those clear the crossmbr on an A-body?

chuckd71

iTrader: (23)

Going to guess no. Would like to be wrong though, always good to have more options.

BanditDave

iTrader: (11)

Not even a prayer...

LSCha0s

iTrader: (4)

Im running 98 vette manifolds. I cut the AIR fittings off and welded them shut. .They look and fit great.