calc the increased displacement?
then multiply this increase by a rule of thumb of, 1 hp per cu. inch . short answer.
as you see , those 0.5mm over size rings and piston are really nothing.
see that scale there.?
displacement is Pi times Radius Squared, times stroke (equation out of school book for cylinder. )
so calc. the before and after displacement?, then subtract the, 2 products.
then multiply this fraction times 1. (1hp per cu. in)
then times 4 (4 cyl)
behold, not squat.
i did that not only to answer your question but to show others on how to calc. displacment easy.
Askikng about compression ratio,? that gets slightly more difficult.
finding free power is hard. (no such thing as free)
all sig increases come at huge expense. "even simple NOS"
one can find a few HP by cheating the smog devices and forcing car to slightly richer. "EFIE"
Cat back exh . maybe 1hp? (or can backfire (no pun) and actually reduce HP.)
the best question ever asked is,
I have $1000 what can i do.?
I have $3000 what can i do./
Speed and power cost and only you know the purse.
tis a fact.
If you don't care about smog, or other issues.
you can put in a cam. and pray the ECU dont go crazy off its rocker.
if you put to much cam in, it and the plenum vacuum will flutter at idle and the ECU will hate that and mix the wrong fuel.
as Jeff Hartman said (in both new books)
first you must learn to fool the ECU
if you dont have time or the money or LUCK to do that, then switch to a custom ecu
and then there are NO RULES. (other than physics and your imagination)
hope that helps.