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Thread: 7.4 Vortec heads on an early block?
          
   
   

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  1. 10-10-2004 10:30 PM #1
    v8fiero400
    v8fiero400 is offline Registered User
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    Car Year, Make, Model: 88 pontiac fiero
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    Question 7.4 Vortec heads on an early block?

     



    I hear the new Vortec heads are great for torque.... My question is.... Can I bolt Vortec gen 6 heads on a mark IV (1978) 454 short block? What head gaskets should I use? Thanks!
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  3. 10-10-2004 11:53 PM #2
    76GMC1500
    76GMC1500 is offline CHR Member
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    I belive the only difference between the current 496 and older big blocks are the heads, roller cam, and no fuel pump boss. The 496 is a stroked 454/427, I believe the bores are the same. Yeah, if anything, the intake manifold may not fit, but I have heard nothing of the sort.
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