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I read the 6.4 blocks have better cooling and bigger bore capabilitys than the 6.1 blocks, is this true? if so why not run the 6.4 block even though they are vvt?

Honestly just sit tight and see what this new 6.1 block turns out to be. The aftermarket support sucks for the Gen III market as a whole but it really sucks more for the VVT blocks. Only failure I have seen is a guy with a Procharged 426" 6.4 do a REALLY long, like 10 minutes, WOT run and it seized the middle cam bearing, sheared the cam dowel and the rest is history. But the chain was fine lol! Im not even sure if the cam bearings are even serviceable on the VVT blocks.



Sounds like a good idea

2000 Dakota R/T, 408 magnum, 727, Indy heads
1000cfm 4150 carb, 93 octane fuel.
motor; 10.258 @ 132.78
200 shot; 9.262 @ 144.69
racemagnum