Carb Swap

[legman292]

I swapped out my Rochester 4GC Carb for an Edelbrock 1406 with electric choke on my 65' 442. I have two questions,

Does my vacum advance on my distributor need ported or manifold vacum? The Edelbrock has two ports on the front. Also where is a good place to wire my electric choke, The instruction manual says to use any ignition switch activated circuit, but warns against using the positive side of the coil. Any suggestions?

[joe_padavano]

The electric choke should be run to a switched +12V circuit, but you should put an oil pressure switch between the source and the choke. These switches close with oil pressure when the engine is running, so if you leave the key on without the engine running won't prematurely heat the coil and open the choke.

[legman292]

Thanks Joe I wired my choke using the oil pressure switch as suggested. Choke works perfectly with no needed adjustments. Kudos to Edelbrock for making a fine Carb. Now all I need to do is fiqure out the vacum signal my distributor needs. Before I took the Rochester 4GC off, I unplugged the vacum advance hose and put my finger over the port while it was idling. I did notice a little vacum but not significant. Still trying to figure out ported or manifold vacum.

[joe_padavano]

I like to run straight manifold vac but it depends on the advance canister, the initial timing, and the quality of fuel. You can really make either work.