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Those look similar in design to the shorty headers allowed by IMCA. It would still be their call as to if they will allow them. I would assume you will have to be on 2" pipes with turndowns like the chevy open motors. You will likely be required to use the Schoenfeld 3" to 2" reducers also. I...

I had one of those JC Whitney cast iron exhaust dump outs on my 72 318 dart. I had it mounted between the muffler and the y pipe. It was operated with a choke cable. The flapper would work loose and rattle all the time. But as a 16 year old it was fun to go from stealth to obnoxious with the...

I get that about being busy and all but now as a result the suspense is killing me too.

As far as performance , how did the motor respond to the head swap?

Thanks. I've been looking at the speedmaster threads but didn't happen upon a direct comparison. Sounds like 318 will run will be doing it. Can't wait to hear his experience.

Got me to thinking. Do you have direct experience comparing stock vs speedmaster heads? If so I would like to here your thoughts about the two.

Thanks for the info. So maybe a smaller than factory coupler would do the trick.

Is it d453?

Thanks for the reply. Can you tell me the part number for the headers? Thank you.

What headers have members used with Speedmaster aluminum heads? How is the fit with the spark plugs etc. ? My application is 69 barracuda, small block 360 , power steering ( Borgeson box) and power brakes. Thank you.