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Thread: GM 305 small block exhaust manifold plugs

  1. #1
    turbo addict Turbo Mopar Contributor iTurbo's Avatar
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    GM 305 small block exhaust manifold plugs

    I'm working on an '82 Impala and I had to remove the small metal tubes going to the exhaust manifolds due to rust. I believe this was part of the smog pump system which has been removed. Does anybody know where to get plugs to seal the holes? There was a tube with what looks like a double flare tube nut for each cylinder so I need 8 of these.

    I tried NAPA and they didn't have them. I can't seem to find them at Summit Racing either.

  2. #2
    Supporting Member Turbo Mopar Contributor supercrackerbox's Avatar
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    Re: GM 305 small block exhaust manifold plugs

    Junkyard small block manifolds from an older year?

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    Super Moderator Turbo Mopar Staff 135sohc's Avatar
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    Re: GM 305 small block exhaust manifold plugs

    From the pieces removed can you ID the thread pitch/type ?

    looks something like this ? http://www.carid.com/standard/second...FYGRHwodNOkEeA
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    Supporting Member Turbo Mopar Contributor GLHS60's Avatar
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    Re: GM 305 small block exhaust manifold plugs

    Most everyone just jambs in regular brass plugs, no need for double flare etc., they seal fine.

    Thanks
    Randy


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    Randy Hicks
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    turbo addict Turbo Mopar Contributor iTurbo's Avatar
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    Re: GM 305 small block exhaust manifold plugs

    Quote Originally Posted by 135sohc View Post
    From the pieces removed can you ID the thread pitch/type ?

    looks something like this ? http://www.carid.com/standard/second...FYGRHwodNOkEeA
    Yup, that's what I pulled off the car. The original was rusted out.

    I ended up going to Home Depot and bought 8 1/4" male NPT cast iron pipe plugs. They seemed to fit pretty good so I'm sure they'll work but I haven't got to the point of starting the car back up yet.

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