1 3/4 vs 1 7/8 qtp longtubes please help
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1 3/4 vs 1 7/8 qtp longtubes please help
im in the process of getting qtp longtubes i was gonna get 1 3/4, well if i get 1 7/8 would that make me lose any power or hurt performance since im fairly stock for now? i figure might as well get the 1 7/8 for when i do do a heads/cam swap, would the 1 3/4 give me more power gains than the 1 7/8 since im fairly stock? I want the 1 7/8 but dont want to lose any power since i donthave good cam and heads thanks
#2
do a search
Tons of info on this topic.
My opinion stands, 1 7/8 is too big with stock engine, h/c or 346 cubes. I went with 1 3/4 after debating for a long time.
Some people will think otherwise and have the number and times to back it up
Tons of info on this topic.
My opinion stands, 1 7/8 is too big with stock engine, h/c or 346 cubes. I went with 1 3/4 after debating for a long time.
Some people will think otherwise and have the number and times to back it up
#3
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Originally Posted by Fr33styL3
do a search
Tons of info on this topic.
My opinion stands, 1 7/8 is too big with stock engine, h/c or 346 cubes. I went with 1 3/4 after debating for a long time.
Some people will think otherwise and have the number and times to back it up
Tons of info on this topic.
My opinion stands, 1 7/8 is too big with stock engine, h/c or 346 cubes. I went with 1 3/4 after debating for a long time.
Some people will think otherwise and have the number and times to back it up
I'm interested in seeing your proof.
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I think with 1 7/8, you will lose some low end, but probably have more top end, but you will lose low end anyways with the LT's, but I with the big tubes you will probably lose more. If anything, I would look into stepped headers, kooks, and edelbrock carry these.
#5
Originally Posted by Hardtop00SS
I think with 1 7/8, you will lose some low end, but probably have more top end, but you will lose low end anyways with the LT's, but I with the big tubes you will probably lose more. If anything, I would look into stepped headers, kooks, and edelbrock carry these.
Louie, i dont really have proof. I bought the headers almost a year ago when I was looking. I got the 1 3/4 b/c I wasnt going higher that 346 cubes, and wanted to maintain the low end for daily driving.
In some of the threads, some people would post #'s of 5rwhp or so more made with the larger primaries, and some people would post higher trap speeds. Then on the other hand some people would post losses of power/tq or no gains at all. In the end i went with what was proven and recommended to me from the people ive talked to with headers. I think i made the right decision.
If you are going with larger cubes in the future, 1 7/8 might be the choice so that you only have to buy 1 set of headers. I think that 1 3/4 is perfect for a heads/cam car or any bolton car.
#6
Find a local tuner & ask him if he's tested headers. IMO, you will find that the 1-3/4" is gonna be the better choice for your current & future plans. As you've stated, it's best to have the proof.
Last Summer, I tested headers on my supercharged car & the smaller diameter header made more horsepower mid-range than did the larger header. Slightly higher torque was seen through the RPM range w/the smaller header. They both made the same peak horsepower. From what I saw, it would have taken approximately 100CFM more air movement through the header to get any benefit out of the larger header. I mention this as reference information related to a specific set-up. BTW, was moving 350 CFM through the header via a blower producing 9 p.s.i.. Header diameters were 1-5/8" & 1-3/4".
Last Summer, I tested headers on my supercharged car & the smaller diameter header made more horsepower mid-range than did the larger header. Slightly higher torque was seen through the RPM range w/the smaller header. They both made the same peak horsepower. From what I saw, it would have taken approximately 100CFM more air movement through the header to get any benefit out of the larger header. I mention this as reference information related to a specific set-up. BTW, was moving 350 CFM through the header via a blower producing 9 p.s.i.. Header diameters were 1-5/8" & 1-3/4".
Last edited by LS1-450; 11-26-2005 at 11:09 AM.
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1 7/8 would be a very poor choice for a stock or less than HEAVILY modded 346. IMO you don't need/want them on a 346 unless you are spinning over 7000 and a drag car. definitly not on a daily driver for most applications. on my 408 I saw NO gains untill 6500 and lost a lot of TQ down low. if it was a DD, I would have swapped back to 1 3/4