Headers!! (LT vs. ST)
Registered User
Joined: Apr 2000
Posts: 1,070
From: Austin, TX or Texas State University at San Marcos
Re: Headers!! (LT vs. ST)
Originally Posted by BUBBA
I believe it is an over simplification to state that the smaller the primaries the more low end torque. There are many varibles to take into consideration when talking about the "ideal" exhaust set up.
The first question you would need to ask is at what type of driving do you expect to do. I.e., are you looking for top end or bottom end?
If 1 5/8 is as good or better than 1 3/4 than I guess 1 1/2 would even be better?
And are you talking about shorties, mids, or long tubes?
How big is your engine...283 or 454? I'd say, just my opinion, that if you have a 350 and are limited to shorties, that you'd be better off with the larger primaries, but then again, its not just the "size" of the primaries, its how they are constructed. I'm sure that there are 1 5/8s that are superior to 1 3/4 if they are made right and not all tangled up like the SLP dule-cats (which btw I have). JMHO
The first question you would need to ask is at what type of driving do you expect to do. I.e., are you looking for top end or bottom end?
If 1 5/8 is as good or better than 1 3/4 than I guess 1 1/2 would even be better?
And are you talking about shorties, mids, or long tubes?
How big is your engine...283 or 454? I'd say, just my opinion, that if you have a 350 and are limited to shorties, that you'd be better off with the larger primaries, but then again, its not just the "size" of the primaries, its how they are constructed. I'm sure that there are 1 5/8s that are superior to 1 3/4 if they are made right and not all tangled up like the SLP dule-cats (which btw I have). JMHO
Well put.
Registered User
Joined: Jun 2003
Posts: 3,620
From: Saginaw, Michigan
Re: Headers!! (LT vs. ST)
Originally Posted by BUBBA
I believe it is an over simplification to state that the smaller the primaries the more low end torque. There are many varibles to take into consideration when talking about the "ideal" exhaust set up.
The first question you would need to ask is at what type of driving do you expect to do. I.e., are you looking for top end or bottom end?
If 1 5/8 is as good or better than 1 3/4 than I guess 1 1/2 would even be better?
And are you talking about shorties, mids, or long tubes?
How big is your engine...283 or 454? I'd say, just my opinion, that if you have a 350 and are limited to shorties, that you'd be better off with the larger primaries, but then again, its not just the "size" of the primaries, its how they are constructed. I'm sure that there are 1 5/8s that are superior to 1 3/4 if they are made right and not all tangled up like the SLP dule-cats (which btw I have). JMHO
The first question you would need to ask is at what type of driving do you expect to do. I.e., are you looking for top end or bottom end?
If 1 5/8 is as good or better than 1 3/4 than I guess 1 1/2 would even be better?
And are you talking about shorties, mids, or long tubes?
How big is your engine...283 or 454? I'd say, just my opinion, that if you have a 350 and are limited to shorties, that you'd be better off with the larger primaries, but then again, its not just the "size" of the primaries, its how they are constructed. I'm sure that there are 1 5/8s that are superior to 1 3/4 if they are made right and not all tangled up like the SLP dule-cats (which btw I have). JMHO
I agree that there are many variable that need to be considered when deciding on the optimum exhaust setup.
I was talking about the LT1 engine, since this is the LT1 tech section of the board, not a 283, a 383, or a 454...
http://www.sandersonheaders.com/letsgettech3.htm
See the attached link. To answer your question, Yes, unless you want to break the laws of physics and the conservation of energy, smaller diameter headers will give you better low end TQ. That is, unless they are SO small that they such a restriction that they significantly hamper air flow at low RPM. This is assuming that the headers which you are comparing are the same length primaries. The key is to balance the low RPM gains with smaller primaries without going too small and hurting the bulk flow that the headers needs to support at higher RPM's.
Dan
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Joined: Feb 2001
Posts: 1,234
From: New Bern, NC USA
Re: Headers!! (LT vs. ST)
Originally Posted by turbo_Z
Lots of people make awesome numbers with "shorty" headers. I remember an old member made 420 rwhp with some SLP shorties.. heads/cam on stock bottom end. I put down 340 rwhp with a mild cam(224/230) and the same headers. What really matters IMO is the size of the primaries. Most shorty headers have 1 5/8" primaries while all LTs and a hand full of shorties have 1 3/4" primaries... sets like SLP, AS&M and maybe BBK. So do some research and look at what really matters like track times, dyno numbers and local/state regulations instead of peoples opinions... JMO 
Registered User
Joined: Feb 2001
Posts: 1,234
From: New Bern, NC USA
Re: Headers!! (LT vs. ST)
Originally Posted by BUBBA
I can't view E-BAy, but I would not buy anything that wasn't already tried and proven by Owners on this board. JMHO
I like trying things that others avoid.
Registered User
Joined: Dec 2001
Posts: 438
From: Marquette Heights, Illinois
Re: Headers!! (LT vs. ST)
Not to hijack the thread or anything but, what do you guys think of the dynatech lt's. I am replacing my hooker shorties in the up coming months and was thinking about going with them.
Thread Starter
Registered User
Joined: Oct 2002
Posts: 1,867
From: Drexel Hill, Pa
Re: Headers!! (LT vs. ST)
Well I decided to go with the headers in the auction. Since Im on a budget, they were the cheapest ones that I could find. Since I have a pretty much stock engine, I dont think I would benefit that much more from the larger primarys. Now I look forward to putting them in. I removed the air pump and all of the plumbing today so that will make it a little easier. Thanks for all the good info!
Registered User
Joined: Aug 2003
Posts: 1,214
From: Fort Bragg, NC
Re: Headers!! (LT vs. ST)
I have the headers that were in the auction and yes they are Pacesetters. I have no compliants with them so far. I cant give you any info as far as a power differant bc i put them on when i changed out the motor and such. The paint does burn off really fast. The paint was burning off mine within about 5 minutes of the engine running. So when you see the smoke dont worry its just the paint. You may want to take a look at the O2 sensor hole as one of mine was not right and the inside of the header tore the metal off the end of one of my 02 sensors, just make sure there is enough clearance in there for the whole tip of the O2 to fit. I have about 350 miles on them and they dont seem to be leaking or anything. Dustin.
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Joined: Aug 2001
Posts: 452
From: CT
Re: Headers!! (LT vs. ST)
is it true that the burning off of dirt and everything in side of the headers for the first few startups/miles will kill your O2's? i remember reading something of running the motor with junk O2s or none until everything is burnt off so you dont foul yours... any validity to that? lol
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Joined: Jun 2003
Posts: 3,620
From: Saginaw, Michigan
Re: Headers!! (LT vs. ST)
Originally Posted by BUBBA
Stereo: My father was born in Saginaw. I'm originally from Lansing, now in Oregon.
Hey, that's cool. I was born and raised here. How's Oregon?
Dan
Registered User
Joined: Jun 2003
Posts: 3,620
From: Saginaw, Michigan
Re: Headers!! (LT vs. ST)
Originally Posted by Makaveli
is it true that the burning off of dirt and everything in side of the headers for the first few startups/miles will kill your O2's? i remember reading something of running the motor with junk O2s or none until everything is burnt off so you dont foul yours... any validity to that? lol
Dan
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