Easiest way to tell is just go by engine size. The rest can be very misleading. The only thing that's changed is that an overhead-valve version of an engine can make a bit more power for it's size as compared to a flat-head. A 10 horse flat head often gained 1.5 to 2 horse when switched to overhead valves. Note also that diesel engines always have less power then gas engine if aspirated the same and with same bore and stroke. That is why tractors sold at a certain power level will have bigger diesels to make up for the loss.
20-30 years ago -
A 3 horse engine was 7 3/4 cubic inches or 127 ccs.
A 4 horse was 10.5 c.i. or 172 ccs. A 5 horse was 12 c.i. or 197 ccs. A 10 horse was 24 c.i. or 393 ccs. A 16 horse was 32.4 or 531 ccs.
Besides all that, direct-drive push mowers often post specs at RPMs that engine are not legally permitted to run due to blade-tip-speed regs.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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