Technical 70 and 90 hp

[bluematt1]

Does anyone know or have experience of weather 90hp pistons will fit in a 70 hp block they are a different part number its just I know someone who is breaking a 90hp engine I from what I can find out on the web its mapping and vv turbo the heads listed are one digit different cams are the same
My engine code is 188a9000 and the higher hp is 199a3000.
I know they list different grades.
Any light can be shead I would appriciate.

 

[suddes15]

if they did fit there would be no pint fitting them as they would not change performance at all i have no experience of been inside of the engine on these but i would imagine the 90hp is bored out slightly bigger.

try high lift cams straigh through exhaust polished inlet ports thats will gain performance