Super

You should have pointed out, serial number and casting numbers are the only sure way to tell.

On the engine dad bought the new H in 51 and 300 new in 55. To be honest with you we did noy notice the kind of power increase one can readily read about here in discussions. Yes the 300 had the advantage of TA and IPTO. We pulled the same No. 8 2x14 plow, same 8' disk and same 9' cultivator. Prior the the H my dad had a 42 W4 and that is where he noticed the big difference, switching from W4 to the H. I'll grant you there was some difference between H and 300, but nothing as noticeable as between W4 and H.

You should stop using all those crappy books you buy and pay a bit more attention to what some people are saying in discussion. IH was not that well organized that those guys can write with any degree of accuracy.

If you look at specs there should be little change all the way from 1939 to the last H. The big change in specs came from H to SH. The Super H and 300 should be quite close as well. If that be fact, my dad should not have noticed any great difference between W4 and the H. But that is not the case, where the difference came was between those two, and not between H and 300.

The first time I ever disked with the 300 I said to my dad, " without TA that tractor wouldn't have much more wallop than the H." Dad who by then had done a lot more work with all three than I, said, "The big difference is between H and W4 not between H and 300." Dad was not the type of guy to put the tractor a gear higher just because it would pull it. His plowing all could have passed as competition plowing.

The W4 and H, are quite close on hp specs, and there is more in common than engine. While the castings are different, I think you will find many similarities within. I'm thinking the ratios to the rear axle are exactly the same, and having a wider, smaller diameter rear tire, statistically should give the W4 advantage. After all that is what the standards were built for, pulling where traction was never a problem.