Header tube for 327-350 - Page 2

Alan Roehrich · 03-19-2017, 12:39 AM

Stroke is only one factor. There's port lengths, volumetric efficiency, RPM, and cam timing to name a few.

The suggestion that you buy PipeMax was a good one. Pays for itself on the first set of headers.

Alan Nyhus · 03-19-2017, 09:04 AM

Quote:

Originally Posted by ron mattson

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.

Coleydog, Ron has given you good advice.

What body style/year are you working with? Also, what's your budget for headers? -Al

Coleydog · 03-19-2017, 10:57 AM

That is good info, right along my thinking. My plan is to make up a set in reg steel (inexpensive) make adjustable, test, then do in SS. 70 Duster 340 (with the stock intake lol) E F or G. Still finishing up the cage but trying to get all my ducks in a row now. Info so far is helpful, thank you all

GTX JOHN · 03-19-2017, 02:31 PM

If we are not doing steps we run 1 3/4 Primary 34 to 36 long and a merged
collector if budget allows....That is on both High and Low Comp. 340 Mopar
in Stock (E to G). I would generally expect a similar class 4 Brl. 350 to be
in the ball park with those numbers (Similar compression/Valve Size/HP/Wt.).

03-19-2017, 12:39 AM	#11
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,115 Likes: 1,572 Liked 1,828 Times in 414 Posts	Re: Header tube for 327-350 Stroke is only one factor. There's port lengths, volumetric efficiency, RPM, and cam timing to name a few. The suggestion that you buy PipeMax was a good one. Pays for itself on the first set of headers. __________________ Alan Roehrich 212A G/S

03-19-2017, 10:57 AM	#13
Coleydog Senior Member Join Date: Jul 2014 Posts: 572 Likes: 39 Liked 53 Times in 38 Posts	Re: Header tube for 327-350 That is good info, right along my thinking. My plan is to make up a set in reg steel (inexpensive) make adjustable, test, then do in SS. 70 Duster 340 (with the stock intake lol) E F or G. Still finishing up the cage but trying to get all my ducks in a row now. Info so far is helpful, thank you all

03-19-2017, 02:31 PM	#14
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,733 Likes: 2,802 Liked 2,486 Times in 697 Posts	Re: Header tube for 327-350 If we are not doing steps we run 1 3/4 Primary 34 to 36 long and a merged collector if budget allows....That is on both High and Low Comp. 340 Mopar in Stock (E to G). I would generally expect a similar class 4 Brl. 350 to be in the ball park with those numbers (Similar compression/Valve Size/HP/Wt.). __________________ John Irving 741 Stock 741 Super Stock