318 Poly 2BBL to 4BBL Conversion

[Fishfan]

As I've written elsewhere on the board, I have a 318 Poly in my 66 Polara. This was the "economy" model and came with a 2BBL setup. I've had the car for 10 years and at some point I became obsessed with converting to a 4BBL carb. I searched and searched for the elusive Weiand intake and the best I could come up with was an original cast iron manifold for the single 4BBL carb. These are relatively rare, you tend to see more of the dual 4BBL cast iron manifolds out there. This one had been sandblasted and primed. Other problems on the car as well as real life intruded prevented me from doing the conversion. Now that life is back to normal and car is running well, I'm thinking about it again.

Any tips, suggestions, watch outs? The one thing I'm worried about is clearance with the hood. I get the impression that the 4BBL carbs are taller than the 2BBL and my air cleaner already is touching the hood insulation.

Or should I just sell the damned thing?

 

[66Monacovert]

38167[/ATTACH]

If you do ,I will be glad to take it off your hands..:wavesmile:

 

[bluefury361]

The manifold you have is the latest cast number, used on 60 - 61 poly power pack engines. It was used with a AFB carb.
There should be no problem with hood clearance with the OEM air filter.

I've been searching for one of them for my 61 Fury for awile. Should you decide to sell, put my name in the hat.

 

[64gmc]

I happen to have a dual 4 intake at father inlaws house if he will let me sell it. Case number is 1822004. 58 poly 318. A side note I have the 318 poly out of a 66 fury sitting here too.

 

[Fishfan]

The manifold you have is the latest cast number, used on 60 - 61 poly power pack engines. It was used with a AFB carb.
There should be no problem with hood clearance with the OEM air filter.

I've been searching for one of them for my 61 Fury for awile. Should you decide to sell, put my name in the hat.

Can you tell me how you know it's the latest cast number? Is there a resource online I can consult? Someone else said this manifold was for a WCFB carb.