383 Head Gasket Recomendations

Forced Induction Mopar

  1. Standonit1972

    Standonit1972 FABO Gold Member FABO Gold Member

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    I am going to installing a supercharger on my 383 in the near future. Does anyone have any recommendations for head gaskets? This is a stock shortblock with flattop pistons, and I am using iron heads.
     
  2. RustyRatRod

    RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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    Call Cometic.
     
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    • 1969383S

      1969383S FABO Gold Member FABO Gold Member

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      I used the Cometic to decrease the compression just a tad due to available fuel today. Blown engines will certainly need Attention.
       
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      • fishmens67

        fishmens67 Well-Known Member

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        Felpro 1009 if the deck surface is not prepped for a Cometic gasket.
         
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        • Matts440

          Matts440 Well-Known Member

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          Cometic vote here too, used them on my current build with twins.
           
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          • fishmens67

            fishmens67 Well-Known Member

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            The big block head is fastened by 15 bolts versus a small blocks 10.
            Better sealing with the bolts placed around each cylinder on the 383
             
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            • Standonit1972

              Standonit1972 FABO Gold Member FABO Gold Member

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              I removed the top end of this engine today. It has true L2315 forged pistons, .030 over, and it looks like the pistons are about .010 in the hole. I am going to use a set of 906 heads I have that are uncut. Any idea of the compression ratio? I am hoping some of you experts weigh in. It’s going to be a low boost build, about 6-8 pounds, and I am hoping this setup will be a good one. I have not cc’d the heads, I have the setup to do so, but the valve on the beaker wants to leak instead of flow downwards into the combustion chamber.
               
            • 383Scampman

              383Scampman Well-Known Member

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              L2315F piston with a 906 head and a .022" head gasket gives 9.77c.r. too much for a blower . Fel-pro .042" gasket will bring the c.r. down enough . Remember , blowers make a huge amount of heat . You could get by with 6 lbs of boost but I'm not sure .
               
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              • 1969383S

                1969383S FABO Gold Member FABO Gold Member

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                Is that an HP block? My L2315 +.30 are 0 deck.
                 
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                • fishmens67

                  fishmens67 Well-Known Member

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                  I think there is a variance on an uncut block . 005 -.010 in the holes I have measured. That's a few different blocks.
                  The only piston I have found that dropped in at zero deck is the Badger piston in the 70's early 80's
                   
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                  • Standonit1972

                    Standonit1972 FABO Gold Member FABO Gold Member

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                    It’s definitely not zero deck. It looks like it’s .010 below deck or close to it.
                     
                  • Standonit1972

                    Standonit1972 FABO Gold Member FABO Gold Member

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                    I was able to measure the chamber cc in a round about way. I never could get the drip valve on my beaker to work correctly, so I fill the chamber and then used a syringe to empty it into the beaker. Looks like 86cc is the measurement in both heads.
                     
                  • 383Scampman

                    383Scampman Well-Known Member

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                    that's because the block has been decked for a Fel-pro .042" head gasket .
                     
                  • 383Scampman

                    383Scampman Well-Known Member

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                    that's correct for 906 heads
                     
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