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big block heads, getting them rebuilt/upgrades

Discussion in 'The Garage' started by supersize75k5, Apr 4, 2005.

  1. supersize75k5

    supersize75k5 OrganDonorRacing.com

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    gilbert az
    I am trying to finish up the motor on my 71 project, I want to upgrade to a lopy cam and thuse requires some more head flow,


    so to build a bad a$$ set of big block heads where do i start???

    any advice or exp is helpfull, I want some nice new heads but those are pretty spendy for aluminum :crazy:
     
  2. k20

    k20 3/4 ton status

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    049/781 set of heads, put in large valves, 2.19/1.88 or 2.25/1.88 if you are going really big. Either Chevy Hi-performance or Car Craft magazine, did a flow test between the 049's and the LS6's(of 1970 vintage) heads, and the 049's, with the large valves flowed better.

    I got my 049's off ebay for like $175, then enlarge the valves and if you are ambitious, port match em, theyll flow all you need unless you are planning a 9500rpm race motor.
     
  3. Burt4x4

    Burt4x4 3/4 ton status

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    Yup, on my 454 I have 781's with oversized stainless valves.
    I just ran this engine again yesterday and Raaaappp Raaaaaap RRaaaaaaappp

    Is sounds angry :D
    Next step is to actually drive it :blush:

    Here is a pic:
    [​IMG]
     

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