coparam4x4

2 of the places I ride each have a hill where I have maintained 1400-1500* for about 2-3 minutes continuously w/11k toyhauler behind. I figured with a stock truck, it would let me know if I was pushing it too hard.

GaveUpOnTV

I thought 2004.5 and later had a improved head (although they had some problem of dropping valve seats) and were good for a couple of hundred degrees more (up from 1250 to like 1500)
Is this correct or is this a 'senior moment' for my memory?

soulezoo

They have the sodium filled valves and oil jets on the pistons for cooling, but the piston material is the same from what I was told. (the crowns are different shape though) Same material is about the same melting point.

j-fox

All of these trucks have the piston cooling jets!!!

jrussell

Right, but the newer ones are supposed to have more and/or better placed cooling jets.