Big block Chevy build

Discussion in 'PSI Superchargers Tech Questions' started by T-Wrecks, Mar 23, 2021.

  1. T-Wrecks

    T-Wrecks Member

    Joined:
    Feb 13, 2009
    Messages:
    117
    Likes Received:
    1
    Well having sold my DRCE stuff I am going a more conventional route. What do you think about Big Duke heads on a 4.500 bore x 4.250 stroke blower motor and if kept under 8k would stainless valves be fine?
     
    #1
  2. caseyspradlin

    caseyspradlin Member

    Joined:
    Sep 9, 2008
    Messages:
    214
    Likes Received:
    0
    I use them on big chief heads for same combination, but you need to cycle them as they will tulip over time.
     
    #2
  3. T-Wrecks

    T-Wrecks Member

    Joined:
    Feb 13, 2009
    Messages:
    117
    Likes Received:
    1
    I ordered a bare set today, Is there a brand you trust more than the others?
     
    #3
  4. Bjs344

    Bjs344 Member

    Joined:
    Sep 10, 2013
    Messages:
    355
    Likes Received:
    24
    I ran manleys and ferreas in my conventional big blocks at 8400. Exhaust valves would start leaking in 20 passes on a conservative tuneup or maybe 5 if I leaned on it. I had all 8 exhaust valves leaking a bunch with 2 at 100% one time. Changed valves, valve job, good leak down and the car ran within .01 of the previous pass.
     
    #4

Share This Page