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i have a couple threads on this subject at FA. basically the the 8.6:1 have a .020" or slightly larger dish. i dont think it is quite 2.8cc but its about right. i have never seen 9.1:1's in person, but im under the impression that these actually have a slight dome to the piston. there is no such thing as "factory 9.5:1 pistons" which i have only seen 1 place (a website) and part numbers were same as 9.1:1. i was going to offer a sweet deal on the 9.1's but my wholesaler only carries the 8.6. i have looked through most stock aftermarket piston catalogs and none list the 9.1:1 flat top or dome piston. as far as i know the 9.1's are only available from nissan motorsports, and the price is way to high. im still searching for the "magic piston" or to market my high compression ka24e kit. 2 prototypes are in the mix. my pistons will come with 2 top rings in 2mm. also the pin journal must be honed.
just fyi: the early 89 high compression ka24e had 135 hp so other things were also changed beside the unit in the airbox
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