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71novastocker 02-19-2020 07:24 PM

305 header size ???
 
What would be the best header size to run. The combo is 175/248. Thanks.

dragracer502 02-20-2020 11:20 AM

Re: 305 header size ???
 
Found power on the dyno going down from 1 &3/4 to 1 & 5/8

Brian Fink 02-20-2020 11:27 AM

Re: 305 header size ???
 
The late great Jere Stahl strongly recommended 1 5|8 on my 305 ; it made real good horsepower .

Mark Callanan 02-20-2020 02:45 PM

Re: 305 header size ???
 
Quote:

Originally Posted by Brian Fink (Post 608485)
The late great Jere Stahl strongly recommended 1 5|8 on my 305 ; it made real good horsepower .

How much Horse Power love to know??
lol

71novastocker 02-20-2020 06:13 PM

Re: 305 header size ???
 
Quote:

Originally Posted by dragracer502 (Post 608484)
Found power on the dyno going down from 1 &3/4 to 1 & 5/8

Just straight 1 5/8" or with a step.

71novastocker 02-20-2020 06:17 PM

Re: 305 header size ???
 
Quote:

Originally Posted by Brian Fink (Post 608485)
The late great Jere Stahl strongly recommended 1 5|8 on my 305 ; it made real good horsepower .

Just straight 1 5/8" or is that a step header.

Billy Nees 02-20-2020 06:33 PM

Re: 305 header size ???
 
I would probably do a 1 1/2 to 1 5/8 step.

jmoneyfoot 02-20-2020 06:58 PM

Re: 305 header size ???
 
My dish piston 305 2bbl made the most with 11/2"-15/8"step with a merge collector

Jim Caughlin 02-20-2020 07:28 PM

Re: 305 header size ???
 
Based on past experience, assuming it is an auto trans, I'm thinking that 1 1/2 / 1 5/8 is going to work best with a 2 1/4 to 2 2/4 merged collector.

Tom Moock 02-21-2020 01:55 AM

Re: 305 header size ???
 
Brian Fink, I thought you had Jack Davis small tube step headers on your car, per 2007 Hemmings Muscle Machines.


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