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Sensei
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The 500T head is all aluminum (no iron "skull caps') and is a lower compression version... The good set-up is to put the 450 head on the 500 cylinders.....It will bolt-on, although you should "clay" it for valve to piston clearances..... The two bikes have different strokes and pin to crown heights as well as different piston domes.....
 

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Yeah Steve, there was a guy on the old 450DOHC forum that did put the 450 head on the 500 cylinders, and said it really made a huge difference. Do you remember who that was? What is this "Clay" procedure?
 

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Sensei
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You put putty or clay on the piston crowns, bolt the head on, time in cams, adjust valves, etc.........slowly rotate the engine through two complete 4-stroke cycles... unbolt head... measure thickness of clay in valve pockets....If there's clearance, the clay will have thickness...If no clearance, the clay will be cut through showing piston metal ......Thickness vs acceptable clearance equals amount the pockets will need to be deepened.....
See Leethals 360 project...he did this several times (with pics).....

(It's a real PITA on a 450 and you'll need two head gaskets and two camchain links...)
 

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Discussion Starter · #5 ·
I just read that Augustine preferred the 500T head on Hennings 450 race bike. I don't know exactly why. Is the cam and rocker setup the same? And will the 500T head bolt right up to a 450 motor?
 

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Sensei
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It's all aluminum and can be heli-arc welded up and reshaped easier.......He reshapes the ports.....
 

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Discussion Starter · #7 ·
So it fits atop the 450 barrels? Are all of the internals the same as on the 450 head? Can parts be interchanged?
 
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