I never hear much about Offenhauser 360 degree single 4 barrel intakes. Do these perform well in big block chevys. How do they compare to Performer RPM and Stealth Manifolds.

Offy has some GREAT "vintage" manifolds, stuff you wouldn't expect to still be in production.

They've got nothing "new". I think their entire line is outdated. Which is fine if you're building a Buick Nailhead, a 312 Ford, or whatever.

I've got an Offy 3X2 on my 'Camino. (And a Performer RPM Q-jet on the boat.)