Just wondering how the cast iron max wedge headers compare performancewise to standard aftermarket tubular headers. This would strickly be on a street machine. Car has 440 engine, mild performance cam, single 4bbl, A/T and fitted with max wedge headers and complete max wedge exhaust including factory cutouts. At least this is what I'm being told. I'm a rookie at this.

Butch

I would like to know this as well

I have a wedge motor with TTI 2" and full max wedge system but would like to know how much I would lose with a pair of the stock headers.

Hey lots of guys are making good power with the regular 440 HP manifolds, some good 500hp builds there. I would say with those cast headers you wouldn't be losing out on much at all, other than weight!

the only problem is fitting them in the car

I would jump at that chance. No Tube header clearance issues, no header noise, no burned gaskets, sign me up. Too band I got a LA block now.

Will these fit on 68-72 B-Body? Anyone tried?

Up to 70 but you will have clearance problems with power brake booster.If you mill 3/16" off the manifold to head surface,driver side will fit,passenger side,no problems.Don't know about 71 and later.

You'll need some extra horsepower just to overcome the weight.

How heavy ARE they? w flowing tubes & 3" outlet should flow good. I saw a pic of a big block in a 66 dart w them & it was an rb!. I have a mild 451 going into a 65 dart & am considering them but I want to run PS & I'm thinking they'll interfere . Any opinions on this??

You will have to use a Saginaw pump.The hoses need to go under the battery box.The Federal/Thompson pump have the pressure and return fittings in the wrong location.You will also need to change the return fitting on the centering valve.Use one from anything that used a Saginaw pump.It exits almost parallel to the box where the earlier is about 90* and interferes with the return hose being too close to the manifold.Took me a while to figure it out but everything now looks factory.

Another

MW manifolds will not fit in 66 and newer "B" body cars without cutting the firewall on the passenger side(RS). 62-65 "B" body cars had the engine located 1-1/2" more forward than 66 and later cars.

Maybe do the opposite swap of what the Early B-body guys have done for years?

Swap in a 62-65 K-frame in a later B?

I had a set of those on my 1964 Plymouth Savoy with a 440 dropped in it. I can tell you that the hood gets a little on the hot side above the manifolds.
Also, I'm going to have to measure the engine in my 1964 and compare it to my 1968 because I was told the by a well know magazine writer that if I put the later cross member under my Plymouth the engine wold mount higher and further forward. That's opposite of what you guys are saying.
I have an old Hot Rod Magazine Spotlite book on the Max wedge cars. The cover photo includes a 426 stage three with the square tube manifolds that I personally have never seen on a production engine.

Your magazine writer needs a fact checker... Like many writers do...

The photo they used was probably from Chrysler, either a mock up or an artist's conception. The proof reader is retired by now as the book dates from the early sixties. Circa 1963/1964.