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  1. GMC DOWNUNDER

    Original Carburetor Size for 454

    Thanks Guys New or good Q/Jets are a bit thin on the ground here. I am not looking for a high performace truck rather something I can cruise in all day. What size Holley would be good? The truck came in from California a few months ago. It will be staying LHD. Will slowly be chasing up...
  2. GMC DOWNUNDER

    Original Carburetor Size for 454

    G'Day Guys Just got myself a 1973 GMC 3500 Factory 454. During its life it got big HOLLEY on it. Problem is it drink petrol like there is no tomorrow. As far as I can workout the engine is still stock. What was the size of the original Rochestor? What size would be a good replacement?

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