I love a Iron head on Iron block, timing gear motor... But there is NO WAY I'd swap a 1Fz for it...
My friend, you need to look into putting a vvt-i head from a Lexus IS250 or 300... I can't remember... It was the the SC too, IIRC...
I know they swap that head on engines that never had that ECU. I do know there is a piggy back for the ECU to.
You might want to look into that as it could fix a few other problems to.
You might get better bottom end, and you might get better cruising speed MPG...and you might get more power. I've never seen a head, or know it's chamber cc. But if it's smaller, you'll be adding compression to... Heck, I don't even know if the dang thing fits... But I know if I had the time and money I'd look into it...
"Toyota' s award-winning Variable Valve timing with intelligence (VVT-i) technology utilises a sophisticated computer to vary the air intake valve timing according to driving conditions and engine load.
By adjusting the overlap time between the exhaust valve closing and intake valve opening, the engine characteristics can be changed to provide instant engine torque across the entire rev range. This gives the best of both worlds: Powerful acceleration and superior fuel economy. In addition, more complete fuel burn at a higher combustion temperatures leads to fewer emissions. "
Toyota - VVT-i (Variable Valve Timing with intelligence)
I love a 3Fe b/c it suits me. I love a 1Fz to. But dayum! That's thinking WAYYY outside the box there
/sidetrack...