i have a ka and i want to build it to run about 500hp. what size should i bore it to to help make that as soon as i can?
Bore them out an extra 4mm. 1mm bore increase = 75hp, so 4mm = 300hp. Then use LS6 pistons (for toughness), Honda Jazz rods (for economy) and camshafts from an RX7 to give it that lumpy idle. Don't forget to post a start up video.