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RE: truck blocks By RC Moser - 02/16/2001 2:48:38 PM; IP 152.163.204.194 In addition you HD 391 uses the 4.05 bore (also the 361) has a extra compression ring, lower compression (dished pistons) 361 pistons used a full skirt and 391 a slippery skirt due to the extra stroke on the crank) and designed for the low end torque requirements of a large truck. Also, the FT crank is a forged steel crank (stronger) compared to the passanger car cast iron crank and the FT cranks have a larger counterweight than standard cranks (slower to get the RPMs up but more torque due to the extra weight of the crank)(a newton's law of ?) and require external balancing at the flywheel. Basiclly you have a engine made for industrial use which usually means it's stronger. A very good motor...Related in looks, but, check spec. before swapping parts...

This thread, so far...

Skip Navigation Links.  truck blocks -- ben, 02/16/2001  crank snout is thicker, dist opening bigger. -- ., 02/16/2001  Forged steel crankshaft, also has -- mcj67, 02/16/2001 RE: truck blocks -- RC Moser, 02/16/2001  Larger exhaust manifolds -- T1M, 02/16/2001

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