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The toro engine, 425 has the modern or common cam angle. The lifter size is bigger though and the lifters for this engine are a little pricey. It would be the 39 degree and cams are more common for this engine. There are no real performance gains in either 425 in my opinion. If ya do get it be certain it has the larger lifters so you will be sure of cam angle. Also use the deeper oil pan and windage tray and crank scrapers that the toro had. This can add a few HP.
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