Reverse radiusing plenum interior to runners - Old performance thread?

[zak]

I've been looking for a thread regarding the plenum or surge tanks, where someone had set up a machining center to reverse radius and match the plenum to runner openings (Thus creating a bellmouth within the walll of the plenum).

After some searching I think it might have been lost when we lost much of the old Performance threads.

Anyone know who the poster might have been, or remember any other details on this?

 

[St Louis SHO]

Illshoyou.

 

[rbruso]

http://www.shoforum.com/showthread.php?t=92099

Post 23 is what you are looking for, but post 12 is neat, too.

 

[zak]

Thanks to both of you for those useful points. In the one I recall, someone (don't think it was illSHOyou) bolted the (enlarged) BBBs onto the plenums, then reached inside (through the BBB opening) and radiused the plenum wall and BBB together using some sort of custom milling tool.

 

[St Louis SHO]

It was Sean (Illshoyou). He made jigs and shit for it.

 

[notbange]

So does anyone run the horns with their BBB? I've considered reinstalling the horns when I put my newly painted intake together.