The part that encloses the CPI is plastic, but the part where the thermostat is located is aluminum-aluminum is the most common material that is repaired with helicoils.
Randy
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'72 Cheyenne. AC, PS, PB, Rear slider window, tilt. Light yellow (grapefruit yellow according to new sales literature from '72)
'56 Chevy short step V-8 (My dad bought it new!!)
'70 Olds 442 convertible
'70 Olds Rallye 350
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