sbc center bolt heads - Reply to Topic
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Topic Review (Newest First)

  • 30-06-2015, 09:49
    Stude Star
    Quote Originally Posted by nuggets View Post
    As above, centre bolt holes in manifold (4 in total) need drilling/slitting in order to work properly if you use a manifold designed for an old engine. You'll also need the correct flywheel for the single piece rear seal crank
    I think thats relevant to Vortec centre bolt heads but not L98 iron/ali centre bolt heads which you can use the pre '86 manifold with. It's all coming back to me sort of
  • 28-06-2015, 23:34
    Paul G
    you're better off buying adapters from SHOP - whengparts
  • 28-06-2015, 22:04
    johnpaul
    getting back to the original thread.so cal speed shop sells olds rocket replica covers for a centre bolt sbc $220 plus tax and shipping too rich for me, but look so cool
  • 28-06-2015, 21:28
    Stude Star
    I have a pre '86 Holley manifold on an '80 smog SBC short block with '89 L98 ali Vette heads and the intake bolted up just fine, unless I was lucky?

    I just ran 13.99 with this combo with more to come due to fuel starvation at the top end, great budget combo. 10.3-1 compression and 470 lift cam, th700, 3.73 gears, gets proper sideways when it hits second
  • 28-06-2015, 13:24
    Paul G
    Replied!
  • 28-06-2015, 11:28
    johnpaul
    pm sent to paul g.thanks for all other info,my engine was a tbi and now has a 4 barrel edelbrock set up with modified bolt holes
  • 24-06-2015, 21:40
    nuggets
    As above, centre bolt holes in manifold (4 in total) need drilling/slitting in order to work properly if you use a manifold designed for an old engine. You'll also need the correct flywheel for the single piece rear seal crank
  • 24-06-2015, 21:37
    Paul G
    I make mine 8mm thick. You'll be hard pressed to warp them!
  • 24-06-2015, 20:38
    mygasser
    Quote Originally Posted by Stude Star View Post
    Adaptors apparently leak. I have no experience of them though.

    PML do some great centre bolt covers, expensive though.
    i used rover to chevy adapters years ago and when the adapter bolts to head were tightened they warped as the gasket compressed at those points and yes they leaked. not to be put off i removed and straightened them and refitted them with a silicon 'gasket in a tube'. then the valve covers with normal gaskets and leak cured. basically the adapters were then 'glued' to the heads.
  • 24-06-2015, 16:33
    Paul G
    I do SBC & SBF to Rover adapters, I should be able to do some centre to side bolt adapters for you.
This thread has more than 10 replies. Click here to review the whole thread.

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