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What lift?

Discussion in 'The Garage' started by sled_dog, Jul 17, 2004.

  1. sled_dog

    sled_dog 1 ton status

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    Austin, TX
    What is the max lift the factory TBI valve springs will take? I want to build a new motor for my 89 Burb.
     
  2. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    i think it around .450".

    me personally i would put new springs in. i like the z28 springs. lift up to .490 lift and a nice pressure, their cheap too, like $25-$35 /forums/images/graemlins/peace.gif
     
  3. mendonca

    mendonca Newbie

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    450 is definitely the max without some machine work on the heads, or the bottom of the spring retainers for a little more clearance.

    I had a 440 lift cam in my '89 Blazer /forums/images/graemlins/k5.gif for a while. It ran fine, but it was close enough to trash the slip-over valve seals on all of the intake valves after about 2,000 miles. I have since rebuilt the engine to a 383 and remedied that problem.

    I would also suggest getting a cam recommendation from the cam company of your choice.
     

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