2.5 opti cylinder head differences

[150aintenuff]

can anyone tell me the difference in the different 2.5L opti heads are any better than others etc... need to come up with a good set to run on a mild 2.5XS optimax

one side went pop and have a couple sets lying around that appear to have same pocket but smaller chamber sizes as the stock 2.5XS heads are semi hemispherical and the others i have are not

[HydroSkreamin]

The 2.5XS is very much a one-off piece. Heads, pistons, block and adapter are specific to that engine only. I would pay particular attention to piston and chamber combinations matching.

The 135-150 Opti heads should be their own design, the 175 Opti its own design, and Gen1 and Gen2 200XS are each different from each other as well.

Probably not what you wanted to hear, but it is the truth. Good luck on getting it back together.