Originally Posted by Elevinpointsixtoone
...Damn, those L-98's made sense 16 years ago! I can't believe its been that long and I'm still dinking with this thing!...
When comparing your heads to newer designs make sure you understand the differences. Focus your attention to the intake port floor shape and the approach to the valve. Also compare the combustion chambers.
It's imposable to "port" your heads to the current designs with out adding material. The port floor is too close to the valve seat and the chamber shape is wrong.
Here are a few pictures of a more desirable intake port and combustion chamber.