When many people port, they just do the edges at the openings of the ports. Pocket porting goes much further into the head and manifolds. This pays close attention to the area around the valve stem and above the combustion chambers.
There is a lot of variation between heads, so I don't have a good answer about trouble spots. you can usually tell the runner thickness with your fingers, one in each runner. Be careful they are even and you don't get too thin. Remember, if you remove too much on a stock engine you may actually lose performance do to air flow speed. Engines with performance cams, larger valves and higher compression need to larger ports to do their best. A good clean up in a stock engine is usually enough without removing a lot of material.
Port matching is always a good idea. Use the gaskets as a guide and make all the edges between the manifolds and head ports match. An uneven edge will hurt performance.
I don't know if those heads have hard seats. If they do unleaded is fine. But when you take them off you can see if it has hardened seats. If not, have them put in and you will avoid and problems.
How about it some of you guys with the reference books, do those heads have hard seats?
|UPDATED|11/3/2015 6:47:55 PM (AZT)|/UPDATED|
