JD, I glass bead the lower intakes I port and it does a great job of cleaning up the intake without scratching it like sand might. The problem is the upper intake has a powder coat or epoxy paint that is REALLY tough. I tried bead blasting it and it just laughed at me. Try some good paint stripper on it first and then clean up with the bead blaster.
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Tom (Torque) Moss
88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE).
http://www.fastlanecars.com/
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