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Newbie big block question

Discussion in 'The Garage' started by Goose, Jun 21, 2006.

  1. Goose

    Goose 1/2 ton status

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    I just scored a 454 and th400/np203 combo (with spare np208) for $500 and got some questions.

    The casting is 3999289 which mortec showes as a 454 71-79, 2 or 4 bolt.
    the date casting comes out as Nov, 28, 1972.

    The head casting is 353049, mortec as 73-84 oval, open, 454
    with 122cc chambers and 255/119ccc ports
    date casting shows Dec 06, 1972

    Okay, I know nothing about big block heads other than some are oval and some are square.
    Which are better and how are mine??

    thanks in adance
     
  2. ryan22re

    ryan22re 1/2 ton status

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    Oval ports are what you want. Rectangular ports are for drag racing and all out motors.
     
  3. mike n

    mike n 1/2 ton status

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    Rectangle ports are for high rpm use, while oval ports are better for low end grunt.

    049's are about the best factory oval port head you can get, with 781's being the next best.
     
  4. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    Your 353049 heads, commonly referred to simply as "049's", are EXCELLENT heads for wheeling. :wink1: They flow nicely upwards to about 5k or so which is much better than the later peanut port heads. They'll support all the power you want to make with a "normal" wheeling motor.
     
  5. Goose

    Goose 1/2 ton status

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    Sweeet!

    The engine came with an Edelbrock Perfomer 2.0 and
    Holley "4160" rated at 750cfm. (#3310-4)

    The engine hasn't run in an unknown amount of time, so I'll prolly at least take the heads off along with checking maing and rod bearings.

    I'm a little curious to what is inside. Looks like the previous owner may have
    known what he was doing with it.
     

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