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1951 JD A Puller

wont need that kinda power with the creeper gear. Will handle 15.5"s well if you dont get too heavy. High compression aluminum pistons, shaving head with match porting and releiving cyclone "eyebrows" and fine tuning will get you close to 45 hp.
 
You probably won't be able to run second gear with that kind of horsepower. Consider running a 14.9 x 38 tire, this tire actually makes more contact with the ground than the 15.5 x 38. The 14.9 is also a taller tire which will speed up your ground speed, which is always a good thing.
 
Other than being bored .020 over,the engine is all stock. I had a pair of armstrong 15.5x38's on it. And on a good track it would suck the power out of it.
 
well with today"s tracks, shorter chains, and 20" hitches, the modern antique tractor pull does take more ponies than years ago. Ive had stock A"s and never choked them in say like a 5500 lb class. Here is my humble suggestion. 1. make sure your mag or dist is properly timed and producing good spark as well proper point gap 2. you should have a 71 or 72 carb, make sure its properly functioning and settings are maximized, 3. get a set of higher compression aluminum pistons and bore to .090. 4. plane off .150 on the head, get a good multi angle valve job, enlarge bowls, releive the eyebrow i was talking about (shrouds too much of the IV) and match port the manifold to the head. (do NOT use larger valves or get too radical.) This is your cheapest alternative before crossing into the aftermarket pistons, power blocks, or stroking. If you want to finish the season before tearing into it, mess with ign timing and carb settings to see if they are at max potential, and remove the connection to the breather to allow a little more air intake.
 
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