Does anybody here have knowledge of any dyno pulls showing the differences between short tube, mid length, and long tube headers? Or even short vs. long. I have a friend who's dad is putting headers on to his 300-6, and he refuses to accept my technically "unsupported" answer to which headers to put on the truck. So if anybody has a link to any website on that subject, that'd be rockstar.

He just wants to see some type of scientific evidence of what is best to run. I can explain my answers to him with theoretical knowledge..he just wants proven facts. *shrug* If you can help...thanks =).

 

I dont know of any sheets. Each vechicle has different gains with different headers (for example, not all gain torque with long tubes, some can lose torque). I think its going to be tough to find a 'one size fits all' chart. He sounds like a pretty stubborn guy. I say let him buy whatever he wants, and see if he complains later.
"I told you so."


Rich

 

mine with stock manifolds was 177hp and 245 torque
then with shorty header on another 5.4 was 245hp and 305 torque

 

That's a huge gain.. Which brand were they? You did say they were two different engines right?

sorry can't spell....

 

same 5.4 mine is a 98 the other is a 01 there may be a differance in hp and torque stock

 

Yeah, I believe Ford changed heads in '99 which upped the horse power from around 235 to 260.

 

http://www.carcraft.com/techarticles...st/index1.html

Essentially, long tubes for low end, short tubes for high end, tri-y's for midrange.

Also smaller primaries for low end, larger primaries for high end.

Depends on what your trying to achieve...