Does anyone know if the collector size on Edelbrock’s 2-piece 4-2-1 ProFlo header (EDL-6837) is 2.5”? Summit Racing’s website shows the primaries to be 1.75” and the collector to be 2.5”. Is this true? Edelbrock’s webpage only tells the primary size of 1.75”.

Thanks,
GIANT

 

2"

 

Its actually 1 15/16", I have one sitting 2 feet away from me, and I am talking about the actual opening size, not the distance from the outside of the pipe to the outside of the opposite side of the pipe. Definitely do the 2.5" collector mod.

 

b16er,

Is yours the one or two-piece header?

 

Its the 2 piece, EDL-6742. But for b-series they are all the same collector size.

 

Thanks for the info.

I thought that Edelbrock's homepage would have had that dimension listed somewhere but it doesn't.

Thanks again