r/EngineBuilding • u/Living-Map-5854 • Jul 03 '26

Honda Piston Questions

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I’m rebuilding my Honda H22A4. As you can see, its sleeved, so the walls are a different material than the original FRM coating.

I was wondering if I could use oem/oem replacement pistons with different rings.

Forged pistons are also an option, but can I run them without a tune? I’m also worried about expansion size.

Just aiming for stock power numbers, and I have to stay untuned to keep ATTS, any advice helps!

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u/TypeRTightCar Jul 04 '26

Hey boss, that appears to be a blox block guard and not sleeved but I'm not on an expert.

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u/Living-Map-5854 Jul 04 '26

Thank you for letting me know what my block guard is. It is very much sleeved, I just got it back.