don't waste money on something that you aren't going to even use in the future. putting a turbo on the KA isn't a bad thing, plus then a port and polish would be helpful in the long run. If you want the SR, then don't spend a single dime on the KA, don't even put new spark plug wires on it. Just save and get the SR as soon as possible, then you will have a engine you can work on.
I would guess, that the only difference you would have between a stock head and a polished head is the psychological feeling that your car is now faster, but really isn't. Don't waste your time
By the way, your ?, "has anybody modded their KA24E/KA24DE until they got satisfactory HP out of it" the answer is yes. but it doesn't start with port and polish, it starts with cams and higher compression and things that really make a difference. All of which is useless to you if you go to an SR.
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Adam
'89 coupe KA24DE+T
14.1 @ 104 MPH
'88 Celica All-Trac turbo
stock, but no more ecu codes!!
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