bad stat
when i did my camswap some years ago i used a gutted thermostat for breakin.
temp was under 150 for whole breakin and then after cooldown took her for a nice
ride and temp stayed 160ish. Drove it that way till fall when really needed to get motor
up to temp. Agree i would look at stat first, possibly stuck open.
Also check temp of engine with infrared gauge to verify accuracy to gauge.
Gerry
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1968 Firebird 400, 068 cam, TH400 & 13" Continental Converter, Auburn posi with 3:08 factory gears, Cliff's Q-jet resting on a 68 factory iron intake, GM HEI and Ram Air pans and RARE Long Branch Manifolds
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