Header tube for 327-350

Coleydog · 03-16-2017, 02:40 PM

What length do most use for the primary pipe for each engine and collectors

Coleydog · 03-17-2017, 04:19 PM

Must be top secret. Or there's not a Chevy on this site.

SSDiv6 · 03-17-2017, 04:34 PM

You will not get a straight answer because the question is open ended.
There are too many variations of Chevy 327 and 350 engines throughout the years. Some 2-bbl and others 4-bbl, not taking into account the FI engines.
The requirements are also effected by the type of cylinder head, compression and camshaft specs.
If you have a specific engine year and horsepower rating, you might get a response.
I you are curious, you can also purchase a copy of the PipeMax software and put your specs and it will break down the header requirements for the particular data you enter.

monte385 · 03-17-2017, 07:14 PM

Burns stainless has a form you can fill out & they will give a recommendation, for a price I think, & yes Pipemax.

4-2-1 or 4 into 1? I built a set of 4-2-1 for my 421 street engine but never tested against anything else.

Coleydog · 03-18-2017, 03:17 PM

Just remembered I have an old "Smokey" book, I'll reference that. Thanks anyway.

Alan Nyhus · 03-18-2017, 06:44 PM

What's your combination? -Al

Alan Roehrich · 03-18-2017, 08:46 PM

I try to answer most questions, provided I have useful input.

However, if the question does not include anywhere near enough information to allow for a useful answer, I usually simply do not have time to write out a list of things needed to give a useful answer.

Coleydog · 03-18-2017, 09:38 PM

Ok... I don't think the tube length on my 340 Engine is right, I think they build too long a pipe. All I want is just a general size for the 3.25-3.5 stroke crank, since after 60 years someone should have it pretty close give or take a few inches, not trying to fine tune to the 1/4 inch. How about 66-327 Chevy 2, 69 Z-28 302, 70-1/2 Camero Z28-350, all running stock. I had off the shelf pipes on them then but can remember what size after all this time. Just a good starting point to compare. Thank you

rboyle · 03-18-2017, 10:09 PM

I use off the shelf Dynatech steps 1 5/8" primaries to a 3" collector. I'm sure there's more power to be found

ron mattson · 03-19-2017, 12:33 AM

1-5/8 to 1-3/4 14-16 inches of each
With a merge collector for a 4 to 1 set up
or 1-1/2 to 1-5/8 for a tri-y will get you
In the game.

03-16-2017, 02:40 PM	#1
Coleydog Senior Member Join Date: Jul 2014 Posts: 569 Likes: 36 Liked 53 Times in 38 Posts	Header tube for 327-350 What length do most use for the primary pipe for each engine and collectors

03-17-2017, 04:19 PM	#2
Coleydog Senior Member Join Date: Jul 2014 Posts: 569 Likes: 36 Liked 53 Times in 38 Posts	Re: Header tube size for 327-350 Must be top secret. Or there's not a Chevy on this site.

03-17-2017, 04:34 PM	#3
SSDiv6 VIP Member Join Date: Feb 2003 Location: Glendale, Arizona Posts: 3,036 Likes: 710 Liked 1,538 Times in 575 Posts	Re: Header tube for 327-350 You will not get a straight answer because the question is open ended. There are too many variations of Chevy 327 and 350 engines throughout the years. Some 2-bbl and others 4-bbl, not taking into account the FI engines. The requirements are also effected by the type of cylinder head, compression and camshaft specs. If you have a specific engine year and horsepower rating, you might get a response. I you are curious, you can also purchase a copy of the PipeMax software and put your specs and it will break down the header requirements for the particular data you enter.

03-17-2017, 07:14 PM	#4
monte385 Junior Member Join Date: Oct 2015 Posts: 60 Likes: 44 Liked 27 Times in 19 Posts	Re: Header tube for 327-350 Burns stainless has a form you can fill out & they will give a recommendation, for a price I think, & yes Pipemax. 4-2-1 or 4 into 1? I built a set of 4-2-1 for my 421 street engine but never tested against anything else.

03-18-2017, 03:17 PM	#5
Coleydog Senior Member Join Date: Jul 2014 Posts: 569 Likes: 36 Liked 53 Times in 38 Posts	Re: Header tube for 327-350 Just remembered I have an old "Smokey" book, I'll reference that. Thanks anyway.

03-18-2017, 06:44 PM	#6
Alan Nyhus VIP Member Join Date: Dec 2002 Location: Lower Dakota territory Posts: 1,180 Likes: 1,074 Liked 799 Times in 236 Posts	Re: Header tube for 327-350 What's your combination? -Al __________________ "That'll never work....."

03-18-2017, 08:46 PM	#7
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,090 Likes: 1,534 Liked 1,758 Times in 398 Posts	Re: Header tube for 327-350 I try to answer most questions, provided I have useful input. However, if the question does not include anywhere near enough information to allow for a useful answer, I usually simply do not have time to write out a list of things needed to give a useful answer. __________________ Alan Roehrich 212A G/S

03-18-2017, 09:38 PM	#8
Coleydog Senior Member Join Date: Jul 2014 Posts: 569 Likes: 36 Liked 53 Times in 38 Posts	Re: Header tube for 327-350 Ok... I don't think the tube length on my 340 Engine is right, I think they build too long a pipe. All I want is just a general size for the 3.25-3.5 stroke crank, since after 60 years someone should have it pretty close give or take a few inches, not trying to fine tune to the 1/4 inch. How about 66-327 Chevy 2, 69 Z-28 302, 70-1/2 Camero Z28-350, all running stock. I had off the shelf pipes on them then but can remember what size after all this time. Just a good starting point to compare. Thank you

03-18-2017, 10:09 PM	#9
rboyle Senior Member Join Date: Jan 2015 Posts: 603 Likes: 1,453 Liked 586 Times in 162 Posts	Re: Header tube for 327-350 I use off the shelf Dynatech steps 1 5/8" primaries to a 3" collector. I'm sure there's more power to be found Last edited by rboyle; 03-18-2017 at 10:59 PM. Reason: Misread question

03-19-2017, 12:33 AM	#10
ron mattson Member Join Date: Nov 2005 Location: cloquet mn Posts: 464 Likes: 17 Liked 66 Times in 29 Posts	Re: Header tube for 327-350 1-5/8 to 1-3/4 14-16 inches of each With a merge collector for a 4 to 1 set up or 1-1/2 to 1-5/8 for a tri-y will get you In the game. __________________ Ron Mattson 5015 STK