28 gauge steel to block exhaust crossover in manifold

Discussion in 'Engine Topic' started by AJ81Z28, Jan 16, 2021.

  1. 1980RS

    1980RS Veteran Member

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    Those gaskets will not work if the port is more than 165cc stock type heads. Aftermarket SBC heads usually take 1205 or 1206 gaskets for the larger runners.
     
  2. 1320feet

    1320feet Veteran Member

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    Sportsman 2 heads have the heat riser port, but It is typically blocked of at the bowl area. One needs to drill to connect the two.
     
  3. AJ81Z28

    AJ81Z28 Member

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    Thanks for the help. I never knew the crossover was blocked from the inside. I've owned these heads for over twenty years and never really thought about the crossover until recently with this new gas percolation thing going on. I suppose the gas just has more alcohol in it in recent years.

    Plus I guess I've been using the wrong stock manifold gaskets this whole time. It wasn't until recently that they failed. Guess I was just lucky prior to this last set. So anyways, I got the Fel Pro 1205 gasket and I'm about to put it on. I really appreciate everyone's help.
     
  4. AJ81Z28

    AJ81Z28 Member

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    Would you guys use a permatex on the water ports? If so which one? I think a long time ago I used to use the ultra blue. But this last time around two years ago I used ultra grey and it failed. But the bolts also were a little loose. Maybe they vibrated loose or something.
     
  5. sandlapper

    sandlapper Veteran Member

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    around coolant ports: permatex #2 non-hardening pn 80016
    it's neither RTV or Silicon

    put a dab on clean bolts as well
     
    Last edited: Jan 18, 2021
  6. 1320feet

    1320feet Veteran Member

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    I use the right stuff around the water ports sparingly. I also use a tall bead of the right stuff on the ends, and toss the end gaskets in the garbage. There is also a torque sequence that starts from the center. I'll go around about 4 times.

    [​IMG]
     
  7. AJ81Z28

    AJ81Z28 Member

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    That's exactly what I did yesterday 1320feet. Went with the right stuff and chucked the end rails. I'll find out tonight when I fire it up if it all worked. Thanks for all the help.
     
  8. sandlapper

    sandlapper Veteran Member

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    The right stuff ain't always the the right stuff ... it seals Very well but can be Very difficult to separate pan / timing cover / intake that was installed with THR, then cured.
     
  9. ChevyReb

    ChevyReb Veteran Member Lifetime Gold Member

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    I used the fel-pro 1205 and the cross over blew threw the gasket into the heat channel of the intake. I have my intake off now and would prefer to stop this from happening again. This is with Holley 300-36 intake and AFR 195 heads. Seems like I remember back in the day some intake gasket sets came with tabs you would cover the holes in the head to block it off. Factory heads had the square opening but the AFRs have a ~5\16" hole there.
     
  10. 1320feet

    1320feet Veteran Member

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    What about drilling and tapping for pipe plug?
     

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