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Thread: Common Sbc Myth's
          
   
   

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  1. 11-27-2006 07:47 AM #17
    Bob W's Avatar
    Bob W
    Bob W is offline CHR Member
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    Car Year, Make, Model: 1957 Corvette
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    Quote Originally Posted by erik erikson
    What are you talking about?
    Is the 399 a lift value??
    Is the 300 duration a advertised number??
    If think you might be confusing "dwell" that is an electrical term often used when setting points with cam terms.
    Dwell is the amount of time the valve is fully open. NHRA stocker cams had a bigger dwell to load the cyl with fuel. They measured when the valve started to open and when it closed , the cam profile in the centre was fair game to play with. So the cam opens the valve real quick and holds it open as long as it can then closes real fast so that will still pass tech.

    NHRA lists the 431 283 cam at .399 lift and 300 degrees of duration.

    http://members.kos.net/willisb/racecars.html
    Last edited by Bob W; 11-27-2006 at 07:51 AM.
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