Actually I stand corrected, none of the 300 Mercs have a chrome bore. The 300X doesn't have paint on the block. Just the alodine type finish like the 2.5L 260 and 280 Mercury racing motors which are nicasil (coated bores like chrome). Coated bores are tough as nails and require rebuilding more often. They also spin the he// out of them (7200 to 10,000 rpm). The 3.0L ProMAx like the one advertised did not have 300 hp at the prop. It was something like 280hp. The 300x has the 300 ponies at the prop and is made to turn 6800 RPM with the rev limiter at 7100. My 250 rev limiter is at 5800 rpm and prob has around 230-235hp at the prop but because of the extra displacement over the 2.4L 200 hp Merc(like 175 hp at the prop) I saw a gain of 14 mph when stepping up. The 3.0L 225 and 250 will take some abuse as the bottom end is pretty hearty and they can be hopped up with some electronic mods, tighter heads and the like. But you give up durability IMO. Hot rods cost $$$. Then if it breaks you have to throw more $$$ at it. Fun? Oh yeah. Practical? Well that is in the eye of the beholder.
04-28-2011, 10:36 AM
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