1 3/4 vs 1 7/8 header?
1 3/4 vs 1 7/8 header? How much horsepower is needed before stepping up to a 1 7/8 primaries header. How much performance is lost if I buy 1 7/8 primaries header and only have 224-228 size cam?
Although this subject is not without controversy I believe that 1 7/8 primaries will not lose torque or horsepower to the 1 3/4 alternative under any circumstances including stock. On the other hand the 1 7/8 may not gain a lot of torque or horsepower unless and until other modifications (heads, cams, etc.) are added to the motor.
Last edited by Darkman; Jul 20, 2011 at 11:36 AM. Reason: spelling
I agree. The 1 7/8 make a bit more power at higher RPM'S. I would just go with 1 7/8 because incase you upgrade to an agressive Heads and Cam combo or with bigger cubes you won't have to change headers later. Do the job once.
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This thread was just posted the other day about how much more power the 1 7/8ths will give over 1 3/4:
https://ls1tech.com/forums/generatio...p-24-rwtq.html
https://ls1tech.com/forums/generatio...p-24-rwtq.html
What about a boosted app with 7-8 lbs (basically my setup), what would the diff possibly be? 
You would most likely have to repulley It to see the same boost but after that the gains should be notable.
I might add... if you are going the distance with 17/8, get a quality merge not some pacesetter or kook horse **** design.
I might add... if you are going the distance with 17/8, get a quality merge not some pacesetter or kook horse **** design.
Little tip for anyone getting 1 7/8 LT's.
There has never been a better, more perfect set of LT's then when Roger Grotyohan was making his headers, thats why I bought them back in 2002 for my stroker engine.
He went out of business because he started stealing from people....who knows why. But the guys headers are legendary.
He had them made at a place called Tubular Automotive. His jigs were bought by QTP.
SO.......if you want the hands down, best 1 7/8" LT's ever made......order the QTP 1 7/8" LT's. They are the Grot 1 7/8" LT's.
When Roger Grotyohan started screwing people, I was one of them. I tracked down where he had his LT's made and Tubular Automotive made me a set using his jig, thank god. Roger owed them a ton of money and they kept his jigs. Now they make them for QTP.
Good day............
*****With your cubic inches.....expect a small increase in power up top, but I bet you lose some torque.*****
.
There has never been a better, more perfect set of LT's then when Roger Grotyohan was making his headers, thats why I bought them back in 2002 for my stroker engine.
He went out of business because he started stealing from people....who knows why. But the guys headers are legendary.
He had them made at a place called Tubular Automotive. His jigs were bought by QTP.
SO.......if you want the hands down, best 1 7/8" LT's ever made......order the QTP 1 7/8" LT's. They are the Grot 1 7/8" LT's.
When Roger Grotyohan started screwing people, I was one of them. I tracked down where he had his LT's made and Tubular Automotive made me a set using his jig, thank god. Roger owed them a ton of money and they kept his jigs. Now they make them for QTP.
Good day............
*****With your cubic inches.....expect a small increase in power up top, but I bet you lose some torque.*****
.
just fired my 02 ls1 with tsp 1 7/8 LT's and 3 in" ORY. short video for now.
http://www.youtube.com/watch?v=ewuQslCg9vM
http://www.youtube.com/watch?v=ewuQslCg9vM