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Question on GM Heads

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Hossbaby50, Mar 11, 2002.

  1. Hossbaby50

    Hossbaby50 3/4 ton status

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    Ok, My valve guides are leaking, and this summer I am planning on replacing them. I have 2 sets of GM heads. They need to be rebuilt, but I don't have to pay to get them. I looked up the casting numbers, they are

    60cc 283 heads from 1959 and (3755550)
    60cc 327 heads from 1962-64 (3795896)

    Are either set good performance castings, are they worth the cost to rebuild, and what will the 60cc chambers do to compression? My current motor is a Gm crate 300 hp motor. Don't remember the exact compression. What compression am I looking at running with the 60cc chambers? Thanks

    Harley
     
  2. BorregoK5

    BorregoK5 1/2 ton status

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    I don't have any runner specs or casting thickness for you but only the following.

    3755550 60cc 1.72intake / 1.50 exhaust
    1957-62 1x4, 2x4 FI Corvette 283

    3795896 60cc 1.72intake / 1.50 exhaust
    1958-72 283/307/327
     
  3. CaptCrunch

    CaptCrunch 1/2 ton status

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    IMO... the only heads worth sticking on a 350 that are gm stockers are the vortecs or if you want a bit more kick in the mid to high rpm range the large valve Camel humps. Both flow gangbusters. World also makes some good cast iron replacement heads, but they only save you the extra cost of the vortec intake.

    For the money... just get some vortecs. You can't beat it for a bang for the buck street.4x4 head. Awsome velocity and flow at low rpms!
     

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