Quote:
Originally Posted by Formulabruce
FYI on the " 421" mods.
While the drilling of the center hole in block and head helps, the hottest water still remains in front of block as
Water " shortcuts" from the water pump exiting into block straight up to the crossover where the T stat is.
Plugging the 3 water holes in front of block forces water to rear and middle of block First, which EVENS out the block Temps which means your t stat has more actual control over whole engine Temps. This puts Under hood heat in YOUR control with the stat selection, as long as you have a actual shroud and clutch fan. Cost is less than 20 bucks....
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The best advice for me, when I address the Heads. The way I see it, even though I have no vapor lock issues, I would do this on my engine for the long run.