Quote:
Originally Posted by lust4speed
If Pontiac engineers decided that the 421 cooling holes shouldn't be drilled, it's probably a safe bet that they made that decision through rigorous testing. Figure that a machine drilled all the holes at one time in the deck and it didn't matter to Pontiac whether that additional hole was drilled or not, but for some reason they stopped drilling those holes.
Aggressive coolant flow decreases hot spots in the block and heads which is a good thing. If the coolant is flowing twice as quick it would pass through the radiator twice in the same amount of time. Coolant staying in the engine twice as long is going to get twice as hot so no gain in letting it stay longer in the radiator.
I live about 60 miles from Palm Springs and several of our members live in the Palm Springs area. We have found through testing that no thermostat and a properly working thermostat both will produce maximum cooling. Basically the internal restriction of the engine is the limiting factor on coolant flow and even if the Chevy myth of needing a restriction in the system is true for some Chevy's, we have found that it is definitely not true for Pontiacs.
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Good post,thanks!
Do you have any tips that will help our Pontiacs stay cool?