Exhaust valve replacement

I don't know about the valve parts you could just grind the stem off until it matched I would think in the ZZ engine there should not be any serious differences other than maybe diameter for whatever reason between Atkinson cycle and regular I I personally don't really know. But when all this didn't happen well you better look at the back side of your center section and the girdle really good usually that rod smacks all that mess and creates Fisher cracks in the aluminum meaning one generally places the whole center section possibly the girdle and all that making this repair quite a bit more costly than initially thought which is why a lot of times it doesn't get done so I guess you need to be looking at those pieces really close and well there are kits that use a powder and or a liquid and a spray and a black light that might help you make certain you do not have any cracks and weakness You certainly want to know this before you reassemble all this and call it done