Boss Mustang stocker

[Bill Diehl]

Originally Posted by FireSale

I think he's replacing the press in freeze plugs with screw in ones. They are more secure. My Ford Racing M6010 BOSS 302 block came with screw in plugs.

That is correct, and the reason I am doing it is because the class requires factory motor mounts, if he looks close at the pic the motor mount bolt bosses are right next to the core (freeze) plug holes, with no support at all. the "idea" is that the screw in plugs will spread the load across the block casting more evenly....without it the ring seal would suffer. Those that race factory ford castings know the history of fords "thin wall' casting technology. This area is often overlooked. The engineers at ford installed screw in plugs on the original boss 302 and others for this very reason.

A motor plate would solve this but as the rule is written they are not allowed at this time

Rick, I will get a better pic to show you what I mean