Well, now that we got all our 401 nightmares worked out and the engine is in and running well...I'm bored! Need a new project.

Soooo, just got most of the pieces we need to do a junkyard GM TBI on our 401. Got all the components from the same vehicle, a 1990 Suburban with a 350. Then, got the bigger 2 barrel throttle body from a 1989 Chevy Duallie with a 454.

My first question is concerning our dual plane Edelbrock Performer intake manifold. I got the 350 throttle body still bolted to the intake manifold. Looks like the intake was made just for the throttle body. The 454 throttle body is a different matter though. It came with an aluminum adaptor bolted up to it that mates up to a Quadrajet spread bore intake manifold. I guess Chevy used that setup until they depleted their inventory of carburetor style intakes.

It's kinda nice in a way as it sits the throttle body up higher, and it is very smoothly ported from the throttle plates to the intake manifold opening. I would still need to get an additional adaptor to transition from the spread bore adaptor to my square bore Performer intake though. I'm thinking this extra height with the adaptors might be good and act like a high rise intake almost. My question is, the Chevy adaptor isn't completey partioned off. It's kind of, but there is still a connection from one throttle plate to the other. Didn't get the spread to square adaptor yet, so I don't know if that will be "partitioned" or not.

I'm wondering if not having a complete separation between the two banks of the engine is going to be a problem. My understanding is the dual plane separation prevents pistons on the intake stroke on one bank from sucking exhaust, thru an open exhaust valve on the opposite bank, via the intake manifold.

I think I could pretty easily weld some partitions in the adaptors to complete the separation. What do you guys think?

PS-sorting out that wire harness last night reminded me of my old fishing days and line tangles, ha, ha.