Limits of stock exhaust manifolds

Reply Subscribe

Thread Tools

Search this Thread

Dec 23, 2004 | 09:25 AM

#16

Haskin Z28

Registered User

Joined: Sep 2001

Posts: 322

From: Bonita Springs, Florida, USA

Re: Limits of stock exhaust manifolds

my pacesetter LTs and offroad y pipe netted me 27rwhp 26rwtq on a stock motor..food for thought

Dec 23, 2004 | 09:45 AM

#17

GREGG 97Z

Registered User

Joined: Oct 2000

Posts: 1,997

From: Reading, PA

Re: Limits of stock exhaust manifolds

Quote:

Originally Posted by captaindbol

Yes, I am fully aware of the power to be made by headers. But Ive also changed enough burnt plug wires and header/collector gaskets on mine and others rides to know that our world is not perfect and **** happens. Just trying to get some ideas and hear about what others may have seen or done, not say that anyone is a idiot b/c they spent their money and made power with long tubes. Below is a rundown of last years shootout at the Factory Apearing Drags. All cars run through manifolds, 2 1/2" pipes and BIAS PLY TIRES. Almost everyone of them weighs more than our cars as well.

1 Terry Pennington 1969 Camaro ZL1 427/435--11.48 @ 122.5mph
2 Scott Pennington 1969 Camaro SS 396/375
3 Dave Dudek 1970 Dodge Challenger 426/425--11.44 @ 124.25mph
4 Lloyd Ray 1964 Ford Galaxy 427/425--No Show
5 Jim Goode 1963 Plymouth Fury 426/425--13.26 @ 105mph
6 Mike Wowk 1970 RoadRunner 440/390--12.32 @ 111.11mph
7 Randy Boyer 1972 Chevy Corvette LTI 350/255--13.7 @ 102mph
8 Doug Johnson 1969 Road Runner 440/390
9 Joel Nystrom 1967 Plymouth GTX 426/425--11.46 @ 124.97mph
10 Greg Gessler 1972 Buick GS 455/270--11.57 @ 119mph

Comparing our LT1's factory exhaust manifolds to some of these cars is really like comparing apples and oranges. Just starting with #1 on the list, I'm fairly sure a 69 427 ZL1 came with factory headers not a rather restrictive cast iron exhaust manifold like ours. I'm sure some of the others on that list may have had factory headers as well, just a guess.

Hey, anyone who wants to run a big heads/cam setup and keep the factory manifolds more power too them, what do I care. I was just stating in my first reply it doesnt make much sense, to me at least. Didn't mean to offend anyone.

Dec 23, 2004 | 10:02 AM

#18

captaindbol

Thread Starter

Registered User

Joined: Nov 2004

Posts: 377

From: La Porte, TX

Re: Limits of stock exhaust manifolds

My main goal out of all this is to have a car with a/c and leather that goes as fast or faster than my truck.(mid elevens) Just looking at weight I'm puting about 500hp down to the tires, probally more due to the Horrible aero & stock suspention. 504 corrected on the engine dyno, plus a 200 shot. From what I've seen I think I can get away with less and still run the number in a well sorted out car. lol Rather than beat this thread into the ground does anyone have any RWHP recomendations to run mid elevens at 115-118 ish.

Jan 12, 2005 | 11:49 AM

#19

andy katzelis

Registered User

Joined: Aug 2002

Posts: 413

Re: Limits of stock exhaust manifolds

I am running the sig times with stock untouched manifolds and crossover pipe. We'll see if I can get the 10 second pass this May or so.....?

Jan 12, 2005 | 12:04 PM

#20

TigerWoodsJr

Registered User

Joined: Mar 2004

Posts: 245

From: Huntsville, AL/Bangor, ME

Re: Limits of stock exhaust manifolds

Quote:

Originally Posted by GREGG 97Z

Why would anyone install heads/cam and still have stock manifolds? I'm sure there is someone out there with that setup but it doesn't make much sense.

cuz a lifter failed, ate up the cam, and got a good deal on ported and polished heads...just a guess, lol

the manifolds are choking the **** out of my poor car, but I need to buy a beater.

Jan 12, 2005 | 12:15 PM

#21

David94TA

Registered User

Joined: Dec 2000

Posts: 489

From: Chattanooga, Tennessee

Re: Limits of stock exhaust manifolds

There was a guy who posted on http://www.Projecttransam.com who had done quite a few mods and was using ported stock exhaust manifolds and making pretty good power--much more than you would expect. I don't remember the exact number, but it was enough that I did a double take and re-read the sig. Don't remember his name. Maybe you can post the same question over there and he will respond.

Edit: TransAmman97 over at Projecttransam.com
387rwhp/428rwtq Lingenfelter heads/ SLP cam 218/224 Ported/polished stock LT4 exhaust manifolds. Don't know what other mods, but I'm impressed.

Last edited by David94TA; Jan 12, 2005 at 05:17 PM.