Stock Head Info

Discussion in 'Mopar Performance Issues' started by dstan, Jan 25, 2018.

  1. dstan

    dstan Well-Known Member

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    I am looking for some info on a set of heads I have. I am rebuilding a 1968 383 and the heads that I got with them have a 250 casting number. I have done some googling and searched through old forums on here and all I know for sure is that they are 1968 383 only as the other big blocks got the 906 that year and that they are open chamber (I have ordered the tools to cc them and will soon). I am going to run them as they came with the engine I bought and they already have 2.14/1.81 valves installed. I am just hoping to find out how they flow and if they respond well to mild port work.
    Thank you for any info.
     
  2. roccodart440

    roccodart440 Well-Known Member

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    #2951250

    440ci

    1968

    2.08 intake

    1.74 exhaust
     
  3. dstan

    dstan Well-Known Member

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    I had seen that as well, but saw other posts saying it was only on 383's and not the 440's as they had 906 heads that year.
     
  4. IQ52

    IQ52 Well-Known Member

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    The 250 was supposed to be a 1968 383 head only. Sometimes you see it listed for the 440 but I have never pulled a 250 head off anything but a 383.

    They flow like a 516 head, which is poor. The 250 appears to be a 516 head with a large combustion chamber. Porting them they will be better, but never really good.

    We did a dyno test on a 440 that was making 387 HP. When we took off the 906 heads and swapped to a set of ported 516 heads the horsepower jumped to 449.

    Yeah, you got them, go ahead and use them.
     
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    • moper

      moper FABO Gold Member FABO Gold Member

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      I always liked 516 heads. Much cheaper than 915s and totally capable for 90% of guys thinking about using them.
       
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