What size piping gives the best HP
07-10-2001, 02:26 PM
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Car: '87 IROC-Z/'82 RX7
Engine: SBC 355/1.1L Rotary
Transmission: T56/5 Speed
Axle/Gears: 4.33/3.93
What size piping gives the best HP
What size piping should I get from the Headers back to the tail pipe for my '85 Z28 305 TPI. Some people say 3" all the way back, some say if I did that there wont be enough pressure..... Anyone know what's best?
07-10-2001, 08:26 PM
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For a 350 that would be best, if you plan on going to a 350 sooner or later sure 3" will work! But if you're staying 305 get something just a tiny bit smaller, you dont want to loose your torque. Trust me i have the same car.
(this will also depend on if you have cats/dual pipes)
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1985 IROC-Z, nuff said :P
[This message has been edited by IROC-Z_85 (edited July 10, 2001).]
(this will also depend on if you have cats/dual pipes)
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1985 IROC-Z, nuff said :P
[This message has been edited by IROC-Z_85 (edited July 10, 2001).]
07-10-2001, 08:56 PM
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Car: '82 Z28
Engine: 350
Transmission: TH400 4,000 stall
Axle/Gears: Currie 9", 4.56 gears
I'm running 3" single on my 305... made one hell of a difference replacing the monkey job someone did before. Upper RPMs are great now and the low end is still good.
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'82 Z28
LG4 305 .030 over, performer intake, holley street avenger 670, xe 256 cam, tes headers, 3 inch single exhaust, spintech muffler, 14 x 3 inch drop base k&n.
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'82 Z28
LG4 305 .030 over, performer intake, holley street avenger 670, xe 256 cam, tes headers, 3 inch single exhaust, spintech muffler, 14 x 3 inch drop base k&n.
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