347 headers

baine21225 · January 28th, 2009, 05:13 PM

if you don't know already i'm gathering everything for a 347 build and i have some new stainless shorty headers, but the more i think about it the more i want long tubes, i'm not interested in hearing just use what you have because i'd rather have them on there now rather than having to buy a new mid pipe later my goal is going to be around 375/400 whp for now, so my question is should i go with 1 5/8 or 1 3/4 primaries and with a 2.5 or 3.0 in collector. thanks in advance guys.

86er · January 28th, 2009, 06:34 PM

1 3/4 with 3' collector

Racinjason81 · January 28th, 2009, 08:47 PM

over 400 fwhp you would want the 1 3/4 primaries with 3'' collectors and if your going full exhaust 3'' all the way

baine21225 · January 28th, 2009, 09:17 PM

will the 3 in collectors bolt to a 2.5 in exhaust?

White Thunder · January 28th, 2009, 09:19 PM

no you should be fine with the 1 5/8 and the 2.5

M L Struck · January 28th, 2009, 09:26 PM

I have a 347 1 5/8 with 3" collecter and it pulled 447 hp at the crank I made my own h-pipe.

86er · January 28th, 2009, 09:38 PM

prob would have made another 10-15 with the 1 3/4

89LX347 · January 28th, 2009, 10:22 PM

Originally Posted by baine21225

will the 3 in collectors bolt to a 2.5 in exhaust?

hmmmmm. lets think for a second

86er · January 28th, 2009, 10:24 PM

Originally Posted by 89LX347

hmmmmm. lets think for a second

they make collectors/reducers einstien

White Thunder · January 28th, 2009, 10:24 PM

lol i mean you can make em fit

baine21225 · January 28th, 2009, 10:29 PM

Originally Posted by 86er

they make collectors/reducers einstien

thats what i was meaning, fingers didn't register what the brain was thinkning

86er · January 28th, 2009, 10:52 PM

Originally Posted by baine21225

thats what i was meaning, fingers didn't register what the brain was thinkning

that was for 89347lx

not you, some people just dont know, questions are to be asked

89LX347 · January 29th, 2009, 11:23 PM

Originally Posted by 86er

they make collectors/reducers einstien

i know that Einstein, he asked if they can bolt together. they cant, you can bolt a reducer on then weld that to the original exhaust. some people just dont know

grnstang · January 30th, 2009, 12:17 PM

yeah with that much power, run 3" exhaust all the way out the ass it will sound so sweet

January 28th, 2009, 05:13 PM	#1
baine21225 MM Fanatic Join Date: Jun 2007 Location: Baltimore, MD Posts: 4,349 iTrader: 1 reviews	347 headers if you don't know already i'm gathering everything for a 347 build and i have some new stainless shorty headers, but the more i think about it the more i want long tubes, i'm not interested in hearing just use what you have because i'd rather have them on there now rather than having to buy a new mid pipe later my goal is going to be around 375/400 whp for now, so my question is should i go with 1 5/8 or 1 3/4 primaries and with a 2.5 or 3.0 in collector. thanks in advance guys. __________________ "That's how Dad did it, that's how America does it... and it's worked out pretty well so far..."

January 28th, 2009, 06:34 PM	#2
86er I Post Entirely Way Too Much Join Date: Nov 2006 Location: Memphis, TN Posts: 7,626 iTrader: 0 reviews	1 3/4 with 3' collector __________________ Just a truck 5.4 3v: 264hp 317ft lbs rock stock The "search" button, its not just for porn piecing together the next project faster than your first sexual experience

January 28th, 2009, 08:47 PM	#3
Racinjason81 Hardcore Enthusiast Join Date: Feb 2007 Location: New jersey Posts: 1,559 iTrader: 0 reviews	over 400 fwhp you would want the 1 3/4 primaries with 3'' collectors and if your going full exhaust 3'' all the way __________________ Heres a real funny video youtube.com/watch?v=ojB7KkaR03I VTEC stands for Very Torqueless Economy Car Honda stands for Hold On Not Done Accelerating 1991 LX 5.0 H/B(T-70 turbo coming soon)

January 28th, 2009, 09:17 PM	#4
baine21225 MM Fanatic Join Date: Jun 2007 Location: Baltimore, MD Posts: 4,349 iTrader: 1 reviews	will the 3 in collectors bolt to a 2.5 in exhaust? __________________ "That's how Dad did it, that's how America does it... and it's worked out pretty well so far..."

January 28th, 2009, 09:38 PM	#7
86er I Post Entirely Way Too Much Join Date: Nov 2006 Location: Memphis, TN Posts: 7,626 iTrader: 0 reviews	prob would have made another 10-15 with the 1 3/4 __________________ Just a truck 5.4 3v: 264hp 317ft lbs rock stock The "search" button, its not just for porn piecing together the next project faster than your first sexual experience

January 28th, 2009, 09:26 PM	#6
M L Struck Hardcore Enthusiast 85 GT/86 SVO/2010 GT500 Join Date: Oct 2008 Location: Rossville IN Posts: 1,183 iTrader: 0 reviews	I have a 347 1 5/8 with 3" collecter and it pulled 447 hp at the crank I made my own h-pipe.

January 30th, 2009, 12:17 PM	#14
grnstang Hardcore Enthusiast 91 LX 13.7@101 Join Date: Oct 2008 Location: Norwalk OH Posts: 1,426 iTrader: 1 reviews	yeah with that much power, run 3" exhaust all the way out the ass it will sound so sweet __________________

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