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Zero shrinkage so you can easily take port measurements at any given point. Not sure about making a mold of something. To remove it from the port you have to slice it behind the valve guide with a razor making a nice clean cut and then PULL it out the manifold face.
What razor do you use to reach down into the port for the slice? I started experimenting with this a couple of years ago. Have a port I poured that I had trouble removing the mold and I set it aside until I had more time for it. The razor may solve my issue.
I hope my leftover mold mix is still usable after sitting so long.
-'76 Volare, 340, 950 Holley HP, 3500 stall, 8 3/4 w/4.11's, 11.80 E.T., 113 MPH
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