Those are the holes for the air injection system, which is run by the
air pump. If you are without those things, plug them, and watch your
compression rise!
Regards, Bill
BarrMark262@aol.com wrote:
>Hi List: My 74B is running pretty well now thanks to all of you. However,
>there are four threaded holes (7/16 by 20 pitch) located just above the spark
>plugs but below the top of the block.
>When I shut the engine down, I see "wisps" of white smoke coming out of these
>holes.
>Are there threaded plugs that should go in these openings?
>I have tried to see if so from photos in my books, but cannot determine if
>they are there or not.
>Will one of you identify these openings and tell me what I should do about
>them. My parts books do not identify.
>
>Thanks
>Dennis
|