Originally Posted by F-BIRD'88
Here is a pic of a fully ported 083 head.
You can see there is serious flow paths around the guide now.
These are not my heads but heads done at home by another guy who did not listen to the arm chair experts.
These 083 heads flow over 270cfm (2.08" valve)
When done generously @HOME with just a 1.94" valve they flowed over 240cfm.
At first glance they look like well ported heads, i don't like the duel flow paths philosophy, this type of head has a poor short side radius and as a result has poor flow on the bore center side of the valve, the typical fix is to bias grind the bowl and try and turn the air away from the wall side, smilier to a swirl port, material should not have been removed from the outside wall side of the bowl, if these flow 270 cfm it looks as though it will all be out the front, combustion efficiency and low speed will probably be poor.