I am curious if any of you guys have any knowledge on whether or not filling the heat riser on emission legal heads(world s/r) will help flow/power some? A member of a different board gave me the idea of beating up some old aluminum pistons, melting them with a torch and then pouring it into the heat riser(using sheet metal blockers to keep the aluminum from going into the actual bowls). Would this provide any gain? Seems like the big hole there has to be pretty turbulent for flow.

wow

Originally posted by ovelle:
wow Care to elaborate?! Maybe its just me but a big hole in the side of the bowl, regardless if its blocked further down by the tin gasket thing seems like it would create a lot of turbulence and hurt flow.