Making molds of a part or 2

Thats awesome to see ! Lots of work there.How much over size do you make the parts to adjust for the shrinkage? I never took that into account, untill I asked a buddy about doing a 3D model of a slant 6 head, so I could shop around for a foundry.Shows how I dont know the field very well.
Great stuff, might look at some kick panals whan you get your extra sets.Keep up the great progress!