[Shuie]

Sounds like a cool motor.

Im not an engine builder, but I think 41mm ports are going to be a little big.

I thought about building a 2.5 for a while and was planning on using S/RS ports, S/RS MFI, S+ cams, 2.2 rods & crank, single plug ignition, and custom J&Es at 9.8:1.

You would probably open the ports up a little (maybe 38mm) if you were going to run a really crazy cam, custom MFI, twin plugs, and higher compression, but you would obviously be adding a lot to the cost of the build.

you may want to try to post on the engine rebuild forum. There are guys there that can offer a lot better advice than me on the subject of engine rebuilds.

good luck and keep us posted as you progress.