Either hole can be used for a water temp sending unit. It is most common to use the one that is on the driver's side [left]. Just put a plug in the other hole.
Enterprising engineer types have also used the holes to run additional cooling lines to the cylinder heads.
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65 Catalina sedan. Allen Thomas Performance 495. KRE Heads at 310cfm ported by SD Performance, ProSystems Dominator carb on ported Victor intake, P-Dude custom grind hydraulic roller, MSD ignition, 3.50 Moser/Ford rear. F-Glass front bumper by son Rob, rear by the old man and joint effort for trunk lid. 3950# w/driver. Best of 9.5761/139 on 175 shot, 6.01 /114 in 1/8.
Last edited by 66bonne; 11-03-2006 at 12:26 AM.
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