Yes, using the stock head gasket, 1/2 mm thickness of piston dome maybe will result in good quench with H89 -- or other closed chamber head. if so you could run on premium pump fuel. Not only does this gain power, but increases the fuel economy more than the increased cost of fuel. Win win

Also save on pistons, use less expensive gasket, no machining costs

SSS Kiwi has the right idea in this thread Bike pistons when found will be lighter stronger and allow much higher revs with less load than most car sourced pistons.

I have used Honda XR500 Pistons in a L series 2.3 litre stroker rally engine and being so light they allowed that engine to rev about a 1000 RPM more than normal L series 2400's as people refer to them as, Most were not actually 2400cc more like 2290cc,Therefore check either Wossner or Wiseco catalogs for diameters but I do not believe they give crown heights in most cases but do give pin sizes so some research could be worthwhile

Totally agree for an NA application but I have a high comp. boosted application in mind. That requires heavier duty pistons for the extra heat and occasional ping.

I have a few sets of Mazda pistons lying about
2699's
77mm and +.5mm I think

few speedway users in early 80,s used bike pistons. Pretty sure they were Yamaha FJ1100 pistons early model

I looked up the FJ1100, wiki tells me it's a 74mm bore, and the FJ1200 is a 77mm bore.

Yeah 74mm to 81mm

18mm pin from memory
Can't remember the pin height though

Ay dude if you come up with something let us know.I am going turbo as well--just worried about the manifold [was watching THE FABRICATOR or turbo fabrication on youtube] that dude is quite good although i doubt the equal length but it is close.

I did some similar research and found that Chevy Aveo uses a 79mm piston with very short skirts similar to motorcycle pistons. They have an 18mm pin and a 27.10mm pin height. I also found that a Kia Spectra 1.8 T8D connecting rod dimensions are very close, center to center distance was 135.89 I think. This combo would work in an A15, when I checked on Rockauto it was possible to buy a complete piston set and four rods for $428.00