[TopJimmy]

Here's my input on the EOS manifold, which I have on my built engine:

- Heat soak is a major factor. A big block of aluminum like this soaks up all the engine heat. My EOS is coated with thermal ceramic and that doesn't stop the heat. I'm adding 50/50 WMI in the J to cool back down…some.

+ The runners off the plenum are longer (for PI), which improves midrange torque. I have no personal data or pre/post dyno, but corvette experience tells me about runner/plenum volume and it's effects.

- The longer runners take up space, and my Wagner TMIC now has minor hood clearance issues. I think a Mishi would still fit well…

- The Meth bungs per runner are not very usable…they're too close to the head for IAT cooling, and you'd use the PI to add fueling. If you ran 6x small Meth nozzles for fueling and one clogs you go Boom with a lean cylinder.

- The interior surface is very rough and loaded with casting flash from when they poured the metal into the molds.

IMHO:
I think the stock plastic manifold plus a good PI spacer would be best in all but the most extreme builds. Plastic doesn't soak heat and this should avoid the need to pre-cool IATs with Meth.