It's simple and easy to preheat the lower intake piece in an oven and reduces the time to reach critical melting temps in the weld pudlle area, do it even though it isn't absolutley necessary - believe me as a guy who has welded over a30+ year period.
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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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