318 stroker - Piston itch....

The 2.02 valves are going to hurt your performance as they are too large for the port size and this is why I used the 1.78 and didn't have to valve relieve the pistons very much. The 2.02 is going to stick out a good bit further and the piston will need to be relieved much more. This engine shouldn't need more than a 1.88 valve as the largest as the bore just can't support any larger. Once again error to the conservitive side and it will work better. The air flow #'s that the heads made with the 2.02's are also achieveable with a 1.78, and should have been used. The 2.02's are going to hurt port velocity severly, so Tq. and Hp will suffer.