I don't think you'll see much more power with the 1 7/8, just the fact that rpms are somewhat "low" and the compression as well. JMO

 

not with your combo n/a.

 

You'll be fine

 

What about mine with a 351 stroked to 427,11 to 1 comp. solid roller cam?

 

I really dont think that you are gonna lose that much power running the 1 3/4 headers on your car. I have a 427 in mine and am actually taking the 2" hooker super comps off and getting a pair of 1.75" primary headers. The hookers actually choke off more through the adapter plates than i can see the smaller primary headers without adapter plates ever doing!

Anthony

 

One of the issues I was concerned about was the 2" bolt pattern on the BBK's was enough to choke of the exhaust ports on my AFR 185's never mind the larger 205's.

 

I cut and grind the collector open to the size of the mid pipe.

I can't justify spending big $ on headers for mine.

Tim

 

I did this and cleaned up the welds on the inside of the headers openings. I did not read of anyone doing this before I tried it it just looked very restrictive. I later found out it was very common thing to do.

 

That is good to know, i thought all headers over 1.75" had to use the adapter plates. I run brodix track 1 225's and i cant find a header gasket to utilize the whole exhaust port. We'll all figure it out one day.

Anthony

 

Use high temp copper RTV. The orange/gold stuff. It works good for me between the header and adapter plates.

I use a 2" header on my 408, but it is just because its what I got with the motor. A 1 3/4 or 1 7/8 would probably make more power in my application.

 

Personally I don't think you are leaving much on the table with the 1 3/4 tubes...

I think the restriction is at the flange where they pinch it to fit the narrow bolt pattern.

I went from mac's to Accufab's and the wide pattern. Definately the right move.