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Jim Caughlin · 02-20-2020, 07:28 PM

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.

02-20-2020, 07:28 PM	#6
Jim Caughlin Senior Member Join Date: Mar 2002 Location: Woodburn, Or Posts: 688 Likes: 84 Liked 806 Times in 246 Posts	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.