I'm running about 400 hp in a 72 duster with a mopar 360 magnum in it. Now I am trying to figure out what size header to run for maximum horsepower.

 

1 3/4" for sure, 1 5/8" will lose power. Look for equal length tubes.

 

What's the best 1-3/4 header

 

Without spending a fortune probably Hooker. The TTI headers may fit better.. Race Hooker.. Street TTI

 

I run Headman headers and they have a lifetime warranty and fit well. They are very reasonably priced and have a ball flange instead of a collector gasket.. Also when put the pipes on I built in a balance tube for better sound and low end performance. My headers are 1 7/8" and I ran 2.5" exhaust to the rear of the car.. No complaints here runs great with no issues...Bill

 

Large diameter headers make hp small diameter make tork ur 360 has plenty of both
Way more than the cheby and furd guys can have with out spending $1000s more than you and u will get hunderds more runs out of yours befor u may have to rebuid her.
also tuned headers are great.

 

What is the outcome???? You went silent... Did you find the header you want???

 

Not quite yet. Haven't been able to decide plus the cars in storage for winter. But thanks for the input guys.

 

Look at TTI .....

http://www.ttiexhaust.com/Category-C...tep/TTi340.htm

 

How big is the difference in hp and torque between the tti and dougs. Street use mostly