98 and 91 kade motors any different?

[BigVinnie]

Originally Posted by S14DB

If you could find out and PM me or post here that would be great. I wounder if this is why I make more power than average.

Correction on my info...
Just went through my list of information.
It was only the Pentroof design and shape that changed on 95-98 heads. Pentroof design and shape increased flame front for maximum power and effeciency without changing the characteristics of it's CR, compared to 91-94 model years which obviously lacked effeciency.
97-98 use a much more aggressive ignition timing and fuel dumping than the 95-96 model years.
All (240sx) KA24de pistons are the same from 91-98.

(Boosted) 240sx KA24de builders transplant 1998 and above production Altima/Frontier/Xterra KA24de pistons for a lowered compression of 9.2:1, with lowered rings and almost the same dish volume, and show a difference of .25mm difference in both ring's and a .3mm difference in the oil ring.
Altima/Frontier/exterra pistons that are used are during the 1998 and above production, not pre 98 240sx KA24de.
I recieved the proper info for the KA pistons from Gabe Z at HybridKa. He ha s the list of all Nissan KA/Z/L production date pistons.