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According to the GCR:

Comp Ratio limited to 12.0:1. Cylinder head prep per I.T. specificiations except that the head may be milled to achieve max compression ratio (I.e. no porting, stock valve job, no chamber mods). Valve Life: .500" max. It can also be milled to utilize O-rings to replace or supplement a cylinder head gasket.

You can change the cam, rocker arms, valves (must be stock diameter), guides, seats and springs.

The bottom end can use a cylinder block from any model from the same manufacturer which is dimensionally identical. Can also have a billet crank, Corillo (or any type) rods, aftermarket pistons 1.2mm larger, aftermarket flywheel (same diameter - but can be lightened), any clutch assembly except carbon. Can use any oil pump including a dry sump. Also can use any type of windage tray and/or accusump. You can also remove the disty and change to a crank fire system.

Someone gets a beer on this one... I'll buy the first round!

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