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Stage 1 Vs Gs Heads

Discussion in 'Street/strip 400/430/455' started by 72buick350, Sep 11, 2003.

  1. 72buick350

    72buick350 i love my BUICK

    WHAT IS THE DIFFERENCE IN ANY?? I JUST BOUGHT A 70 GS HEADS. THANKS
     
  2. rh455

    rh455 Well-Known Member

    No such thing as GS heads. They're just regular old 455 heads. The stage 1 head has the bigger valves. The heads you bought may have come from a GS but are the same exact head on an Electra or Rivy.
     
  3. 12lives

    12lives Control the controllable, let the rest go

    heads

    Yeah, but the 70 heads are nice for the smaller cc. 69 cc I think vs the later heads at 71cc or 78cc. You can have the stg valves installed, but the stage heads were 66cc in 70.

    - Bill :Comp:
     
  4. GSXMEN

    GSXMEN Got Jesus?

    Albert - Also keep in mind that you can't just have the larger Stage 1 valves installed without having anything else done!! In addition to the larger valves, Stage 1 heads had the bowls 'hogged' with a 77* cutter (I believe that's the right angle).

    Without opening up the throat, the heads would flow WORSE than the small valve heads. :Smarty:
     
  5. 72buick350

    72buick350 i love my BUICK

    okay guys what i eventually want to do is build a street motor w/ 450 hp, and i would like to have a 9:1 CR and a t 56 behind that. can i get a 9:2 CR with these heads.
     
  6. Dale

    Dale Sweepspear

    Re: heads

    If one were to put '70 heads on a '72 engine what would it bring the compression to?
    When they lowered compression in '71 did they dish the pistons more? or use the larger cc heads? or both?
    I know the '72 cam isn't the same grind as in '70, how did that effect compression?
    I'm refering to the standard 455 here.

    Forgive me,
    I just asked alot of questions and perhaps I should have started a new thread, but I think they are relevent to Albert's question.
     
  7. rh455

    rh455 Well-Known Member

    You can put a '70 head on any year block and raise the compression some. Due to the variances in deck and compression heights, the '70 wasn't a true 10.0:1 anyway. If I remember correctly, the rule of thumb is 1cc = .1 of a point in compression. Standard 455 heads are 69cc's uncut. Stage 1's are 66cc's uncut. The '71-'72 head is 71cc's uncut. But the '70s had a little better flow. You'd raise compression more but decking the block and milling the heads. The pistons are dished a good bit more. That's where the most compression is lost. In '70, I think the piston dish was like 20-21cc. In '71, it went to 28cc's.
     

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