1. moparsquid

    moparsquid FBBO Gold Member FBBO Gold Member

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    i have a 383 with 516 cylinder heads i know they are closed chamber with poor design my question is ,is it possible to make them work with a dual 4 manifold and a low lift long duration cam and good set of headers and electronic dist.
     
  2. 66Satellite47

    66Satellite47 FBBO Gold Member FBBO Gold Member

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    I have done a number of 516 heads & for a moderate performance applications. You can make them work fine. Change the exhaust valves to the larger 1.74 size (906 style) or the larger 2.14/1.81 package & do a basic pocket port job.
     
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    • rolling_Thunder

      rolling_Thunder Well-Known Member

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      I ran some 516 heads on my old 383 build - seemed to work well overall - I did take the overall advice of getting rid of the stock 1.60" exhaust valves and went to 1.74" - other than that I just cleaned up the castings with a little blend work in the runner and pockets - didnt take much out - just smoothed it out. I figure with the 383 and a mild build the smaller port would increase port velocity compared to a larger runner... I ended up running a MP purple shaft (six pack grind) and some headers with a 4bbl and edelbrock performer intake - made 333hp at the wheels... not really a screamer but was a nice street engine with great reliability and good street manners with the mild cam.
       
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      • moparedtn

        moparedtn Ed on the Ridge FBBO Gold Member

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        I got an old original set of 516's taking up space on the shelf if anyone needs them...
         
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        • moparsquid

          moparsquid FBBO Gold Member FBBO Gold Member

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          heres another option i have a set of 915,s on a 67 440 hp motor its a correct 67 block (10-67) with correct heads and intake is this is this worth more together or can i use the heads
           
        • 66Satellite47

          66Satellite47 FBBO Gold Member FBBO Gold Member

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          I would guess that a block cast in 10/67 is a '68 motor. The 915's may not be original to that block or it's a low perf '68 motor. A 915, if it's the HP version(1.74 ex valve) would save you the trouble of up-sizing the ex valves.
           
        • moparsquid

          moparsquid FBBO Gold Member FBBO Gold Member

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          your right i made a mistake with my fingers its 10-66 with a stamp on the pad of c440 hp
           
        • moparsquid

          moparsquid FBBO Gold Member FBBO Gold Member

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          have a few pics looks like original chrome style valve covers

          20200428_172419_resized_1.jpg 20200428_172410_resized_1.jpg 20200428_173844_resized_1.jpg
           
        • 66Satellite47

          66Satellite47 FBBO Gold Member FBBO Gold Member

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          A numbers match '67 440 HP seems valuable. The 516's would work fine if you're not racing & looking for best ET.
          I'd still pocket port the 516's & put the 1.74 valves in them. I've done them for a 383, .500 ish lift cam, 69 Charger mostly stock, 12.80's.
           
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          • moparsquid

            moparsquid FBBO Gold Member FBBO Gold Member

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            maybe a pass or two but mostly street use im pulling the 500 and putting into a 64 polara race car from back in the day trying to have fun and keep mopar history going

            64-1.jpg
             
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            • 383man

              383man Well-Known Member

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              The thing is unless you do your own head and valve work is it worth spending the money to work them and put the larger exh valve in them ? When you can buy modern aluminum heads for $1000 to $2000 dollars. You may spend almost as much money working 55 year old heads as new aluminum heads may cost ? Just something to think about. Ron
               
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