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?are you wanting to do this so you can pull the plow better?

 

I'm not going to say that you'll find any huge gains by doing what you want to do, but how can it hurt. 

 

I've spent countless hours at my Superflow also, I've spent a lot of time on the Allis heads but I have not done much with one from a D-15 tractor.  I've done a lot with the 201 and 226 heads.  Various valve sizes, valve and seat angles, various bowl angles to see what works the best. 

 

One of the biggest things that you can do is to radius the corners in the intake runner where the intake charge has to turn to one cylinder or the other or in a sense the T shaped port.  There's a fair bit of casting there, but don't get to wild.  The further you cut that back, the better these things flow.

 

So just a nice three angle valve job, a bowl blend and radiusing the corner and it'll move more air than the manifold or carb will anyway.

 

I spend some time on the manifolds cutting a radius on the bottom corner of the runner where it turns into the head, makeing it flat, or a D shaped port.  The carb flange and neck, do the same.

 

I'm guessing you just want it to run the best it can out playing in the fields......

 

I've made some heads and manifolds for some verry large or high speed engines for these tractors, but that's another story I'll save for later.

 

Frankly until you find that the purchase can't do what you need from running out of power AND it needs internal engine work I'd leave it all alone.

 

Do the heads on these tractors have allot of casting bumps and ledges? It's true I haven't purchased my tractor yet, but there is nothing wrong with dreaming. I am also looking at a D-17 and a D-15 here in town, they one popped up from a source here and one on craigslist the other day. I have slowed myself though as not to make a rash decision since this will be my only mule for now.

I tried to go see Mark last weekend but I am i the middle of moving to the farm and things have been hectic. But we are talking and I called him last week and he offered for me to see his collection, sounds like a super nice guy.

 

 

So does my wife Dixie.

 

 

 

 

 

 

I used to pull, ALOT.  But, I dearly love working these old horses and listening to that engine work all day long. 

 

Thanks Dave, alot of people don't know, but that in itself is a performce upgrade. Almost all of your top end Truck pullers and drag cars use a jesel type shaft rocker system because of it's relaibility to be able to turn way past 10 grand with out distorting and floating the valves. So are these AC engines amc derived engines or gm derived?