small block heads

Discussion in 'Small Block Mopar Engine' started by 75dart sport, Aug 24, 2018.

  1. 75dart sport

    75dart sport Active Member

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    how do you determine what ccs heads you have
     
  2. toolmanmike

    toolmanmike FABO Staff Staff Member FABO Gold Member

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    Measure them to be sure. Manufacturers specs are not too accurate.
     
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    • dartfreak75

      dartfreak75 Well-Known Member

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      You have to cc them take a piece of plexiglas and seal it over the chambers and the fill them with a liquid measuring the liquid remaining in the tub. I always used a 100 cc tube and then subtract how much is left. That will give you how much you used.
       
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      • 75dart sport

        75dart sport Active Member

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        thanks
         
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        • 75dart sport

          75dart sport Active Member

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          thanks
           
        • 75dart sport

          75dart sport Active Member

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          thanks
           
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          • Wyrmrider

            Wyrmrider Well-Known Member

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            75 post up your casting number and year if you know it- those here can give you a worst case low cr high cc guess
            of course if they have been milled along the way cc's would be less, cr higher
            real original ccs may be 5 ccs greater than published numbers - which turn out to be the MINIMUM that race sanctioning bodies will accept
            for example 74cc adv BBM 915's are closer to 80 and open chambers vary from 86 to 90
            gasket thickness- almost no one builds with .020 or under steel shims unless you are a class racer .028 and around .040 are much more common
            pistons vary in compression height and valve pocket cc's
            taken together they can add up to quite a difference
             
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            • 75dart sport

              75dart sport Active Member

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              4343475-a
               
            • 75dart sport

              75dart sport Active Member

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            • dartfreak75

              dartfreak75 Well-Known Member

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              Those are 360 heads
               
            • 75dart sport

              75dart sport Active Member

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              wyrmrider, I dont if it will help but the motor is out of a 76 model van and has the big 2 inch valves and i think 1.75 is the other
               
            • 75dart sport

              75dart sport Active Member

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              yes out of a 76 model van
               
            • dartfreak75

              dartfreak75 Well-Known Member

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              Probably around 1986?
              They are probably close to 80ccs
               
            • 75dart sport

              75dart sport Active Member

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              motor is 1976
               
            • Wyrmrider

              Wyrmrider Well-Known Member

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              2.02 valves in a van?
              someone has been into this motor before
              best to cc them but the estimate is close to do some "what if's"
               
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              • 75dart sport

                75dart sport Active Member

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                a camper van motor had never been into till i did it about 9 years ago n health got bad and didnt finish but stating on it again
                 
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                • 75dart sport

                  75dart sport Active Member

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                  so i will probably have alot more questions on here as i go
                   
                • dartfreak75

                  dartfreak75 Well-Known Member

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                  That casting number does not match up with the year either maybe someone swapped the heads at some point
                   
                • nm9stheham

                  nm9stheham Well-Known Member

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                  I 99.99% seeeeeriously doubt those are 80 cc chambers. More likely 73 or so....
                   
                • dartfreak75

                  dartfreak75 Well-Known Member

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                  I cc my 360 heads and years back and they 76-77 range maybe I'm mistaken or did it wrong lol
                   
                  Last edited: Aug 25, 2018
                • nm9stheham

                  nm9stheham Well-Known Member

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                  72-73 seems to be typical for the larger open chamber heads. 80 or so would be well out of the normal range.
                   
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                  • 75dart sport

                    75dart sport Active Member

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                    20180828_162253.jpg 20180828_162247.jpg 20180828_162228.jpg 20180828_162226.jpg I talk to the guy I got the motor from n he said it came out of a one ton camper van
                     
                  • furrystump

                    furrystump Well-Known Member

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                    What’s on the head surface? A little grease on the head to seal the plexi glass. Just make sure a bunch doesn’t squeeze into the chamber.
                     
                  • 75dart sport

                    75dart sport Active Member

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                    no they have been rapped in saranwrap for 9 years to keep them from rusting very bad yesterday was the first time they have been unrapped since I got them back from machine shop.i was just showin some the valves n casting number and the info i got from the guy i got them from cause they said they didnt come out of a van and they didnt come of a 76 model and his dad bought the van brand new
                     
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                    • dartfreak75

                      dartfreak75 Well-Known Member

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                      Noone here disagreed with you on the year or what they came off of. That is a later casting number so I said 80s you said 1976 i never disagreed with you. Then someone said something about the valve size . Noone is disputing you !? That casting number is also found on 318 4bbl engines which used 360 heads and intake. I think they where used from 75-84. As for the valve size I have no idea I have never had of those heads my 360 heads have 1.88 intake valves and my 318 has 1.78. I personally have never seen a stock 360 head with 2.02 valves but that doesn't mean nothing.
                       
                      Last edited: Aug 29, 2018