STG 4 Head Porting results

Discussion in 'Race 400/430/455' started by buicksstage1, Jun 29, 2018.

  1. buicksstage1

    buicksstage1 Well-Known Member

    I finally got into a set of these stg4b heads that I got Mike to do, I am really happy with the results. No welding at all. I bit more modern combustion chamber shape but still need to finish the exhaust side of the combustion chamber and ex port and I am not sure that the intake runner is finished yet either. STG4 NEW HEADS.jpg STG4 NEW HEADS 2.jpg STG4 NEW HEADS 2.jpg STG4 NEW HEADS.jpg STG4 NEW HEADS 2.jpg STG4 NEW HEADS 3.jpg
     
    Julian, 300sbb_overkill and Kingfish like this.
  2. Bens99gtp

    Bens99gtp Well-Known Member

    Nice heads........
     
  3. Tom Righter

    Tom Righter Well-Known Member

    Nice flow numbers how wide is your intake port
     
  4. buicksstage1

    buicksstage1 Well-Known Member

    1.550 can still go another .050
     
  5. Tom Righter

    Tom Righter Well-Known Member

    Yeah I was able to get 380 at .600 lift my intake port is 1.400 I’m in the process now of going to 1.500 what intake are you running the Mopar? I’m switching from the SPX to the Mopar. Yours look very nice!
     
  6. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    Nice work Chris!

    What size valves are those?
     
  7. buicksstage1

    buicksstage1 Well-Known Member

    Mopar, we made 926hp with the spx and the old stg4's. What lift are you peaking at? what size valve?
     
  8. Tom Righter

    Tom Righter Well-Known Member

    2.260 intake valve wasn’t too concerned about higher lift past .650 as this is with my old iron block so I was running a solid flat tappet made over 800 HP. On a stingy chassis Dyno, car was 3400 pounds went 930 at 143 Now building aluminum block so I’ll concentrate more on the higher lift
     
    Julian likes this.

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