Anybody know if long tube headers work for an Expy? The passenger side manifold on my 2000 Expy 4x4 is ticking like crazy and I'm thinking about getting some LT headers. Only problem I have is that they state that they only fit F150's. Shorty's are out of the question, but that is all I've seen that say they fit.

Thanks in advance.

 

you'll be fine with the OBX long tubes

 

If they dont fit (which I think it would if not be real close) you can get a torch and manipulate the headers to fit.

 

x2 on tarajerme said. pretty much anything that will fit on an f150 will most of the time will fit the expy...it is the same chasis..right?

 

I was looking at the OBX LT headers and have my fingers crossed that they fit. Everything looks the same under the hood as it did on my F-150, but I didn't know if the transmission is an issue because the Lightning and Harley trucks use the same transmission if I'm not mistaken, and they say that they don't fit those trucks.

I gotta say that $500 for headers and cats is pretty cheap!

Any clue as to what the stock cats go for when you recycle them?

 

$50-$150

 

http://www.summitracing.com/parts/PS...n/?prefilter=1

You can get these coated as well. And there 1 7/8 primary’s

I know some will not agree with me but I always use loctite #272 and not the 262. I’ve always had to order the 272 on line sense most stores don’t care it. I’ve tried the locking header blots which always seem to back off a little and still leak.

I never use any of the gaskets supplied with any of the headers sold. I personally have always had good results with BBK gaskets.

PS you can always get the loctite bolts out by using a benzomatic torch on them. Loctite sure as hell beets tightening them up every couple of days just to still end up with a leak.



This was taken from a SHM book I bought
Most Shorty headers for the f series trucks are 1 5/8 in diameter and are not equal length. The packaging makes equal length shorties virtually impossible. The Shorty header does not really tune the exhaust to make more power, since the tube length is so short and unequal. The 3-5 hp you would measure as an improvement is likely the result of reduced combustion dilution vs. a long style cast iron manifold and the fact the exhaust port heat is allowed to escape the port rather than back up into the cylinder.

I prefer larger primary tubes. There is a trade off between header primary diameter and primary length. The smaller diameter primary will maintain a higher gas speed but the back psi higher than a larger tube, resulting in increased pumping losses at higher rpm. most main stream header mfg's are also used to mfg a header primary for carb engines. a carb engine relies on the exhaust system to provide a vacuum signal to the carb. FI engines can tolerate a larger tube without the low speed loss of drivability that can affect a carb equipped engine with large tube headers. Our dyno tests have proven that even a dead stock 4 valve cobra engine can make more power in all rpm ranges with a 1 3/4 in primary tube header. gains of 7hp and 8lbs of tq over 1 5/8 headers are not uncommon.



Tons of good info in the How to build max performance 4.6L ford engines book
By Sean Hyland it covers all 4.6 and 5.4 engines. This guy is the king of the ford mod engines!!!! I have never run across any one else in person our by the internet that knows even a half a lick of what Sean knows bar none!