Honda / Acura K20a K24a Engine Forum banner
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On a K20A you can bore out to 87mm no problem, but Honda only offers 0.25 mm oversized pistons and rings, so if you want to stick to Honda parts you're limited to 86.25 mm. For some bores 0.25mm is not enough to remove the bore out of round (which can be 0.006" on a stock engine which has had a hard life). K24 engines can't be bored much - Honda has a 87.25 piston/ring, and I think the iron liner looks pretty thin above this.
91 mm would probably be the max on a k24a but you would really need to ask block experts like golden eagle, darton, rs, etc....

Nikos
 

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The K series shares the same bore spacing as the H series . . . . and taking an H series out to 91mm would really be asking for trouble (if it's even possible). 90mm is the most you'll find anyone running - and they'll usually end up with head gasket sealing problems in short order. An 89mm bore is the typical limit. You might be able to get away with 89.5mm, but you won't find any off-the-shelf pistons in that size.
 
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