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 Underhood 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 Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather
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