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Hey otterbob'
No reliability issues to be concerned about with the mods you've mentioned unless you frequently spin the motor to the rev limiter. These big twins, like any long stroke, large bore engine, try to throw the recriprocating mass out of its confines at excessive RPMs.
Just don't get too wild with the cam or you'll require high pressure valve springs and your low end torque will suffer. Big cams require head work to realize any real performance gains.
No reliability issues to be concerned about with the mods you've mentioned unless you frequently spin the motor to the rev limiter. These big twins, like any long stroke, large bore engine, try to throw the recriprocating mass out of its confines at excessive RPMs.
Just don't get too wild with the cam or you'll require high pressure valve springs and your low end torque will suffer. Big cams require head work to realize any real performance gains.