It's hard to beat an "A" versus "B" comparison to confirm a performance increase by changing one component. I didn't have that luxury with these TFS Twisted Wedge heads since my entire engine combination changed when I installed the Incon.

Besides removing 60# of weight off the front end (the Incon added 140#) were these heads cost-effective? Absolutely.

There are no sharp edges in the combustion chambers.  The same smoothing of all sharp edges was applied to the piston tops, and to the face and edges of the valves.

If you use intend to use your stock rocker covers with TFS heads, chunky aluminum roller rockers, and a cam with .510"+ lift, you will have the same interference I had between the #1 rocker and the screw that retains the oil baffle. Some quick grinding on the offending screw will solve this. Use Loctite 290 Red thread locker on the shortened screw. Not pretty, who cares? It works, it can't be seen, and you can put your money into something more productive.

Butchered oil baffle?  Poor craftsmanship in fabrication?  Who cares?  It works. #1 rocker clears the baffle nicely, oil flows into the fill tube easily.

Remove material from the bosses as illustrated below to use your stock rocker covers with aftermarket heads.

My thanks to Brian Renegar for  his solution to the problem of aligning the lower intake without resorting to the mess of glueing the intake gaskets to the head, as I used to do.