ka24 block is cast iron. On the business end.... cams r direct acting(no rocker arms)
For daily use, a KA torque actually makes it a pleasant drive... and it can be quiet. Unlike those noisy small displacement high revvers, annoying exhaust & induction noise and having to rev the piss outta it to get any grunt. Lotsa shifting, short gears too. KA is a different animal.
Just because KA makes more torque lower to midrange, dosen't mean it won't rev/pull past 7000... thing is, no need to.
KA has posted ridiculous street and drag ETs, especially considering the mods used.
High mileage KAs done well over 400hp atw + a robust 400+ft-lbs tq, std innards.
Enough to pee-ur-pants in street rolla.
Over 500hp & tire-shredding 550+ ft-lbs tq, std head/cam/intake, only piston/rods added.
"Truck" motor or not, KA can be deadly
Dunno what RZ can do on std innards, but I suspect similar potential, if ya wanna keep a rolla all toyota. There was a nice 2RZ powered street rolla detailed on 3tc.com - pistons/rods/std head & cam. At 26psi went 9.8sec. Got an amazing 37mpg too! That is what 'truck torque' can do 4 u :)