I thought the earlier 2nd gens used a temp gauge that maxed out at 250, instead of 260, and the middle number is 210 instead of 220?
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4
2019 Canyon SLT Crew 4X4