What intake manifold for 91 block LS with OBD2 head.

[luciusad2004]

hey all. I have a 91 LS block but when i bought it, it had an OBD2 head of unknown year. Does anyone know what intake manifold I should be using? My car runs OBD0.

I ask because i have never seen my intake manifold in any pictures online. It's stamped p-75 but the vacume ports are strange and i suspect they are hooked up wrong. Does it matter what OBD my intake manifold is or are they pretty interchangeable? I figured newer manifolds might have different vacume ports and such for more stringent emissions systems.

Thanks for any input.

 

[Briansol]

the head casting has basically no obd-specific parts on it. You'll want a b18a obd0 mani to make it easy.

 

[luciusad2004]

the head casting has basically no obd-specific parts on it. You'll want a b18a obd0 mani to make it easy.

Ok thanks. : ) Thats what I figured. Then I should probalby get a vacume diagram for a b18a and go fromt here with trying to figure out my vacume issues?