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Woo Hoo! It has closed chambered heads.

Discussion in 'The Garage' started by mountainexplorer, Jul 1, 2004.

  1. mountainexplorer

    mountainexplorer 1/2 ton status

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    Spokane, Wa./Ione, Wa
    The supposed 402BB in this truck I got has closed chamber heads.

    In search of the mystery noises, I pulled a valve cover, finding out that this is the grungiest motor I have ever seen. After some scraping, I got the casting number.

    3917215 which according to Mortec are '67-'68 Oval port, closed chamber 396 or 427 heads.

    The motor is still running like garbage, has a bad miss and deathly rattle, but after retarding the timing back closer to where it should be, I was able to powerbrake the truck (a dually rear crew cab with a utility box) in my driveway. /forums/images/graemlins/grin.gif

    Still pings some, but if this motor is say a higher compression motor, and I have very low octane fuel in it, I suppose it still will.
     
  2. k5-newbie

    k5-newbie 1/2 ton status

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    nice score!!! Keep us posted.
     
  3. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    i run those on my 396 with a solid cam. good head.. nice score, dont see them around much anymore...
     
  4. k20

    k20 3/4 ton status

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    i believe alot of the 396/402's came w/ closed chamber heads, the rest ive ever seen had the semi-closed(or is it semi-open) heads.
     

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