09-26-2011, 10:17 AM
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CC Member
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Join Date: Dec 2004
Location: Hillsboro,
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Cobra Make, Engine: Superformance SPO2512 427W TKO 600/ NW Exotics 351 Cleveland/Tremec 3550-Sold
Posts: 71
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Not Ranked
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For the amount of horsepower that you're wanting, I really see no reason to spend the extra $2000-2500 for the Dart based engine. The block is more expensive right off the bat and the forged SVO crankshafts are more expensive than what you could use on a 408.
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Good 351 blocks are hard to find in my area. Roller block motors last about one day, when they arrive, in the wrecking yards here. The going rate is $750 for a complete motor. If you're lucky, it'll clean up with a .030 bore. By the time you add in machine work on the factory block, I can upgrade and machine a Dart block for well under a grand.
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somethings to think about, the shp block will put an additional 40# on the nose.
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It looks like it's about 30# heavier.
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If you do decide to go with the Dart based engine, I wouldn't stop at a 4.000" stroke, I would go with a 4.100" or 4.250" stroke for 445 or 460 cubic inches.
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I like your thinking. I had thought about a 438, but I don't have enough intake or exhaust for a high HP 460 cubic inch motor.
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