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  1. #1
    Jr. Apprentice
    Join Date
    Apr 2012
    Location
    Bancroft IA
    Posts
    17

    Default thinking 305 heads on my 350.....

    Just wondering if anybody has done this recently? I have a 90's TBI 350 with bad head gasket looking to swap for 305 heads for more power. Aside from the mileage difference any other pros and cons to this?

  2. #2

    Default

    You will get a compression gain, but your going to lose flow. All in all, IMO you would be p!ss!ng in the wind...
    Chuckie!!!


  3. #3

    Default

    That's been a performance upgrade suggestion for a long time. Apparently, the 305 heads increase compression, which increases power output. How much difference it makes, I don't know.

    I do know, there was two different 305 heads, one has a smaller combustion chamber volume. It's not much, maybe 6 to 8 cc, but I do know one works very well and the other can cause problems (sorry, I don't remember which one is the best one). The casting numbers will help to identify them, look under the valve covers.
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

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