[djl]

Beehive springs in '05 and, per the MoCo, they can handle .575" lift.

The '05 castings were the worst of all the TC castings and flow pretty much flattens out at .400" lift and deal flat by .500" lift. So, why install a cam with .583 lift?

'05 was also the year of the sh!tty valve guide seals. If your bike is consuming excessive amounts of oil, the guide seals are the problem and should be replaced. The guide seals were a running change in the '05 model year so you may have lucked out and dodged that bullet. Mine were replaced under warranty. But, if you have to pull the heads to address the guide seal issue, a street port would justify higher lift cams. Or, if you could get your hands on a set of '06 or later heads, just bolt them on. Some dealers keep take offs around for that reason.

I would be looking at a street port and sticking with the 510s. JMHO

 

[djl]

You need to know total valve travel to know how much lift you can use.Until you know that value it is all a guessing game.You have keeper to guide clearance, valve to piston clearance finally spring coil bind.Also need to know what your spring pressures are closed and open.

Not really. If the OP sticks with "bolt in" profiles and lift less than .570", he will be fine. Question is why go for lifts higher than .510" when the heads start signing off at .400" lift?

Bolt in the Andrews 26 or street port the heads and run the 510.