Back of drivers side head right by the freeze plug, it's the only thing on the back of the head and is a PITA to replace while the head is still ok the car. Undo the wire harness from the holder to get a little more room just be sure you put it back so it doesn't lay against the head.
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BV heads, P&P lower, comp 218/226 cam, 4.2 bottom end, 3k stall, flow 40's, O/R x-pipe, Pacesetter lt's, SCT xcal2 (93 Ortizperformance tune), Windstar upper, 65mm tb, CAI, 8.8 w/ 3.73's, SFC's, cut springs, KYB shocks/struts, MM LCA's
blower/new cam soon
Dealer for Ortiz Performance, great tunes at a good price!