Donut Gasket to Replace Manifold Heat Riser... Thing

Discussion in 'Small Block Tech' started by MrSony, Nov 20, 2018.

  1. MrSony

    MrSony Well-Known Member

    What are you guys using as a replacement gasket? Part numbers would be helpful.
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    If you still have the original heat riser, gut it, and weld the holes closed.
  3. gstewart

    gstewart Well-Known Member

    With Larry..
  4. Fox's Den

    Fox's Den 22 years of racing the same 355 Buick motor


    DEADMANSCURVE my first word : truck

    I think older versions had riser on right side , newer versions we're on left . I think I have that correct . I used older on one side and newer on the other side to end up with no riser . The non riser manifold seems to be longer to compensate for the missing riser to match up with the front exh pipe .
    Stuff seemed to fit ok and looks cleaner I think .
  6. Mart

    Mart '71 350 GS, almost stock

    Yep, headers with mandrel bent pipes the rest of the way.
  7. patwhac

    patwhac Well-Known Member

    I cracked a stock heat riser once when I tried to mill out the center shaft too fast, if you do this make sure to go slow and use cutting fluid (if using a mill). I think I was using a big 2 1/4" rotabroach to try and get a slightly bigger diameter exit as well . . . that was probably a mistake!
  8. Fox's Den

    Fox's Den 22 years of racing the same 355 Buick motor

    If you were driving the car in winter where it gets very cold like 10* out the heat riser might help warm up the engine faster. That is all it was really used for to get temps up faster. Probably more of a restriction in the exhaust than helping to warm up the engine. The one Lark I have I wired it open permanently.

    If I wanted any performance out of the engine I would take it out and replace with exhaust pipe or get some headers for it. Plus it would have a nice sound with a more stock type muffler on it if you do not want a lot of noise when using headers.

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