I wonder how hard it is to machine some real valve reliefs into the 98 GX pistons? They have a 21.0mm wrist pin hole so the ls rods will be a direct fit with no rebushing. Looks like the small end of the rod would still need to be shaved a bit thinner to clear the saddle.

I'm tempted to start putting away some parts now for a budget D-series all motor build in the future. I think I'll order a single gx piston next time I place an order at Honda.

Does anyone know where I can find engine stats on the GX, like stroke length, head volume and compression ratio?