Re: Olds powered 72 GMC
Yeah, I think in 68 Olds switched to a cast iron thermo housing and that was all you got. Also, the 330ci part allow's you room to change the bypass hose without breaking the thermostat seal which is unavoidable with the later model part. AMC V8's also use the exact same housing as an Olds but they too only offer the $12 or $200 option and nothing in between.
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