3s head on 5s Options

[Boss-Celica]

I got some extra cash laying around just waiting to be spent on my car. So I was thinking on puttting a 3S head on my 5S. Has anyone done this before?

[Punch]

this is a massage I got from jim :


3S oil and water pump will fit 5S block. You must use 5S oil cooler and coolant hard lines. 3S rods will fit 5S crank if you get the journals grinded, or use the weaker 5S rods with no modifications You cannot use 3S or 5S pistons, you have to use custom CP or Wiseco pistons available from chrisk on the board.


Well, if you’re using the 5SFE block you need the 5SFE pistons unless you get an overbored set of 3SGTE ones, which would pretty much make them 5SFE pistons. You’ll have to get the crank modified if you use 3SGTE rods as well. That combo should have no problem hitting 300 hp.

A month? Wishful thinking. It took three months to get all machine work done and have all parts in, engine assembled and car fired up. Both rods will fit, upgraded 5S rods are $$$$, 3S rods are cheaper but you'll still spend a bit to grind down the journals on the crank. CP makes stroker pistons that are the size of 5S pistons but with valve reliefs for the 3S head. Depending on the 5S block you may need to have water channels drilled. Etc etc. A good time to consider upgrading the head.



this is jim's web site http://redblues.com/index3.html