Getting my 516 heads done.

1966 -1967 Mopars

  1. BeepBeepRR

    BeepBeepRR Well-Known Member

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    Finally getting my 516 heads done. New valve springs, new 1.74 exhaust valves and bowl work. As well as cleaned and surfaced.. Next I will be tearing the 383 down to have it honed and decked. I ended up swapping out some heads and cash to get the heads done. I love the horse trading...saved me a ton of cash. Next I gotta come up with a horse trade for the machine work on the block..
     
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    • Jerry Hall

      Jerry Hall FBBO Gold Member FBBO Gold Member

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      How much are you going to deck the block?
       
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      • BeepBeepRR

        BeepBeepRR Well-Known Member

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        Just enough to get the sag out of it. The center web is about .004 lower than the ends. Probably would be alright with a thicker 039 head gasket but why chance it. Going to use the Summit K6401 cam and lifters in the 383. Thats the same cam I put in my 440. I may end up putting a roadrunner cam in instead. Havent purchased one yet so that is still up in the air. I want a little rumble but want to be able to use pump gas.. Although I was reading the 67 383 was already 10 to 1 even with the pistons in the hole.
         
        Last edited: Jun 30, 2020
      • Bad B-rad

        Bad B-rad Well-Known Member

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        Are you using stock, or new pistons?
        I ask because some of the 67-69 383's stock piston sticks above the deck at TDC.
        I have read some issues using those engines and 516 heads with large camshafts.
        You may already be aware of this.

        I can give you a link to the information if you are interested.
         
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        • toolmanmike

          toolmanmike Moderator Staff Member FBBO Gold Member

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          :xscuseless: LOL Post some pics when you can. We love to see some cylinder head porn!
           
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          • Bad B-rad

            Bad B-rad Well-Known Member

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            I may have mis-spoken, in above post
            A quick look in some of my books, and the issue is MAINLY using 67 heads on 68-69 383 engines. (they have the positive deck height)
            Or if you mill the heads or block on a 1967 383 AND add larger cam, you may required valve notches.

            Just passing along info.
             
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            • BeepBeepRR

              BeepBeepRR Well-Known Member

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              The pistons are below deck so I don't think there will be any clearance issues. They are 30 over pistons but seem to be stock replacements. Just getting the heads cleaned up and surfaced. Not doing anything to reduce the deck height other than the surfacing. Just a surface, springs and exhaust valve change. The block also needs the sag taken out. I don't think the amount that needs to be removed will be that huge.

              Bad B..
              Yea the K6401 cam isn't that radical. Its actually used fairly often on low compression engines. Lets say for instance a 77 Motorhome 440.

              Duration at 050 inch Lift: 224 int./234 exh. Advertised Duration: 298 int./303 exh. Intake Valve Lift with Factory Rocker Arm Ratio: 0.466 in. Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.488 in.

              These are the pistons that are in the engine.
              https://www.summitracing.com/parts/slp-366np

              Brand:Sealed Power

              Manufacturer's Part Number:366NP

              Part Type:Pistons

              Product Line:Sealed Power Cast Pistons

              Summit Racing Part Number:SLP-366NP


              UPC:724956347360

              Piston Rings Included:No

              Bore (in):4.250 in.

              Bore (mm):107.950mm

              Stroke:3.750 in.

              Rod Length:6.358 in.

              Piston Style:Flat top, with no valve reliefs

              Piston Material:Cast aluminum

              Compression Height (in):1.848 in.

              Piston Head Volume (cc):0.00cc

              Wrist Pin Style:press-fit

              Wrist Pin Retainers Included:No

              Wrist Pin Included:Yes

              Pin Diameter (in):1.094 in.

              Piston Ring Thickness:5/64 in. x 5/64 in. x 3/16 in.

              File Fit:No

              Gapless:No

              Quantity:Sold as a set of 8.

              In-Store Pickup:Choose In-store pick-up (OH, NV, GA, TX) on our web site.

              CalculatorCompression Calculator

              ToolStroker Combinations
               
            • BeepBeepRR

              BeepBeepRR Well-Known Member

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              Should have them back by the end of the week.
               
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              • 1 Wild R/T

                1 Wild R/T Well-Known Member

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                Well since BeepBeepRR doesn't have any pictures ready how about these?


                IMG_5179.jpg IMG_5142.jpg
                 
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                • BeepBeepRR

                  BeepBeepRR Well-Known Member

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                  Here is how far they are in the hole. Not way down but they are down. I don't have a bunch of tools for measuring this stuff.

                  This is cyl 3 at TDC.
                  IMG_3519[1].JPG
                  Cyl 2
                  IMG_3520[1].JPG
                   
                • 1 Wild R/T

                  1 Wild R/T Well-Known Member

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                  Do you have feeler gauges?? A decent straight edge?
                   
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                  • BeepBeepRR

                    BeepBeepRR Well-Known Member

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                    I do have feeler gauges but the only straight edge I have is a 4 foot aluminum level lol.

                    Here is the block sag with the 4 foot level. Note... After looking at it again it doesn't seem as bad as I thought.

                    IMG_3521[1].JPG IMG_3522[1].JPG
                     
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                    • toolmanmike

                      toolmanmike Moderator Staff Member FBBO Gold Member

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                      Not by much. Can you say quench? Not a bad idea to have the combustion pushing on the whole piston! LOL
                       
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                      • BeepBeepRR

                        BeepBeepRR Well-Known Member

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                        Was thinking a steel shim head gasket.. But May end up with the 39's really depends on how much he has to take off the heads.. I honestly think they were in good shape to start with. I just wanted the valves changed and new springs. I just don't want the valves to push the piston down lol...
                         
                      • BeepBeepRR

                        BeepBeepRR Well-Known Member

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                        Here are the 516's when they came off.. Kind of crappy pictures but I was looking at the size of the valve springs more than the heads..

                        IMG_3433.JPG IMG_3434.JPG IMG_3435.JPG
                         
                      • 1 Wild R/T

                        1 Wild R/T Well-Known Member

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                        That 4 foot level will work, hold down on the straight edge while trying to slip feeler gauges between the straight edge & the piston top.... You can get a pretty accurate number that way....
                         
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                        • Bad B-rad

                          Bad B-rad Well-Known Member

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                          BeepBeepRR, sounds like you got a good handle on things!!!


                          Here is a shot of a 69 383 at TDC, (sorry its blurry)


                          223.gif
                           
                        • 33 IMP

                          33 IMP FBBO Gold Member FBBO Gold Member

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                          Just a funny note: the quoted specs from summit is wrong (clearly) otherwise if they were correct, that piston would be out of the hole almost an eighth of an inch. (Specs say for a 3.75"stroke)
                          If fixed for a correct 3.38 stroke, that piston would be .084 in the hole, at blueprint spec
                          It doesn't look that far down to me in your pics, but previous suggestions to use a straightedge and feeler gauges is a good idea. Actual measurement is always better than educated guess.
                          And I would for sure use the steel shim, unless that pushes compression too high (unlikely).
                           
                          Last edited: Jun 30, 2020
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                          • Cranky

                            Cranky Banned Staff Member FBBO Gold Member

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                            .020 down in the hole, .020 steel shim gasket....perfect! Just make sure you have proper V/P clearance.
                             
                          • BeepBeepRR

                            BeepBeepRR Well-Known Member

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                            Got an update.. He said he had to take 20 thousands off the surface to clean them up. Also he is matching the intake side to keep them squared up. Tomorrow he is stopping by to check my block sag. So I will know more about that tomorrow. He also told me the heads already had hardened seats intake and exhaust. So thats good I guess.
                             
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