header size

jmoneyfoot · 02-26-2016, 08:36 PM

Looking for suggestions on header tube size and collector length on sbc 145hp 305 with a 2bbl. Any input is greatly appreciated.

Jack McCarthy · 02-27-2016, 11:21 PM

we ran 1 1/2 on the 283 2bbl back in the day

jack

dmir55 · 02-28-2016, 01:57 AM

With a 4000 stall converter you should run no larger than a 1 1/2 primary tube, a 1 3/8 is better but tough to find unless you make them. Than use a 2 1/8 minor diameter 2 1/2 major diameter collector. These headers would work with the stall r.p.m. recovery point. Hopefully your stall speed and maximum torque are in the same range. We ran a header like this,but with a 4 barrel,with a 302 Ford and ran very well.

dmir55 · 02-28-2016, 01:25 PM

I would like to add something to my above statement. If you do build your own headers, consider fender well headers, There was a reason all those old junior stockers ran them. I would advise you to run a two into one collector, but I think it over scavenge the engine when running a two barrel. Also you can now run any booster. This seems to help two barrel carbs a lot.

rod · 03-04-2016, 05:48 PM

you should contact Greg at REF in Kingman, AZ. Greg has built 10 sets of 305 headers in the last few months. call him at 928/692-0111.
Rod in AZ

dmir55 · 03-06-2016, 02:02 AM

Building your own headers is not that bad. Buy a kit from someone like Headers by Ed and just go for it. You might never want to build another set, but every racer should try it ounce. You will understand why custom pipes cost so much. But just do it.

monte385 · 03-16-2016, 08:39 PM

Heck even us street machine guys tend to build our own.
I built a set of 421 headers for my street machine last year they turned out OK.
If the original poster is interested in having a set built he could talk to Mark at Throttles Performance. Does some nice work.
https://www.facebook.com/Throttles-P...81602/?fref=ts

02-26-2016, 08:36 PM	#1
jmoneyfoot Junior Member Join Date: Dec 2015 Location: waconia mn Posts: 92 Likes: 21 Liked 9 Times in 5 Posts	header size Looking for suggestions on header tube size and collector length on sbc 145hp 305 with a 2bbl. Any input is greatly appreciated.

02-27-2016, 11:21 PM	#2
Jack McCarthy VIP Member Join Date: Feb 2002 Location: lyndon ky. ... louisville area Posts: 1,313 Likes: 27 Liked 440 Times in 111 Posts	Re: header size we ran 1 1/2 on the 283 2bbl back in the day jack __________________ Jack McCarthy 3609 STK "the Captain"

02-28-2016, 01:57 AM	#3
dmir55 Junior Member Join Date: Jul 2014 Location: northern Minnesota Posts: 64 Likes: 0 Liked 0 Times in 0 Posts	Re: header size With a 4000 stall converter you should run no larger than a 1 1/2 primary tube, a 1 3/8 is better but tough to find unless you make them. Than use a 2 1/8 minor diameter 2 1/2 major diameter collector. These headers would work with the stall r.p.m. recovery point. Hopefully your stall speed and maximum torque are in the same range. We ran a header like this,but with a 4 barrel,with a 302 Ford and ran very well.

02-28-2016, 01:25 PM	#4
dmir55 Junior Member Join Date: Jul 2014 Location: northern Minnesota Posts: 64 Likes: 0 Liked 0 Times in 0 Posts	Re: header size I would like to add something to my above statement. If you do build your own headers, consider fender well headers, There was a reason all those old junior stockers ran them. I would advise you to run a two into one collector, but I think it over scavenge the engine when running a two barrel. Also you can now run any booster. This seems to help two barrel carbs a lot.

03-04-2016, 05:48 PM	#5
rod Member Join Date: Dec 2009 Location: Kingman, NW AZ. in the middle of the longest stretch of Route 66 Posts: 313 Likes: 0 Liked 20 Times in 15 Posts	Re: header size you should contact Greg at REF in Kingman, AZ. Greg has built 10 sets of 305 headers in the last few months. call him at 928/692-0111. Rod in AZ

03-06-2016, 02:02 AM	#6
dmir55 Junior Member Join Date: Jul 2014 Location: northern Minnesota Posts: 64 Likes: 0 Liked 0 Times in 0 Posts	Re: header size Building your own headers is not that bad. Buy a kit from someone like Headers by Ed and just go for it. You might never want to build another set, but every racer should try it ounce. You will understand why custom pipes cost so much. But just do it.

03-16-2016, 08:39 PM	#7
monte385 Junior Member Join Date: Oct 2015 Posts: 60 Likes: 44 Liked 27 Times in 19 Posts	Re: header size Heck even us street machine guys tend to build our own. I built a set of 421 headers for my street machine last year they turned out OK. If the original poster is interested in having a set built he could talk to Mark at Throttles Performance. Does some nice work. https://www.facebook.com/Throttles-P...81602/?fref=ts