Not Ranked
Is this 408 a 351W block, bored and stroked of course?
351C requires a by-pass style thermostat. BUT, some after market 351C water pumps don't have the by-pass hole in them, in which case, the by-pass is blocked off due to the pump. It doesn't matter then what t-stat you use, by-pass or regular. Jaguars and Hemi's are two other examples of engines that use a by-pass style thermostat.
Being it's a KC engine I guess Keith would know what kind of pump and t-stat were in play here and why, apparently, the hose by-pass is blocked. Perhaps a call is in order...
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