cool head vs stock with port work

[IrideA250R]

I was just pointing it out for the other guys posting in this thread, as they were saying you should have more compression.

[Snopczynski]

I will say it again, exhaust port duration will affect compression.

[fox_forma]

stock head has been cut and rechambered, now pushing 163 psi in each cylinder. There was a small issue with my comp tester but straightened that out. Just need to rejet a little richer on top but so far it seems to be running pretty strong.