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Vizzard head gasket

Discussion in 'Rootes Racing' started by jdoclogan, Mar 19, 2020.

  1. jdoclogan

    jdoclogan Platinum Level Sponsor

    I've read and accumulated considerable information on the Vizard head to deliver to my machinist. The missing piece of information is how does one modify a head gasket to accommodate the head change? The only understanding I was able to glean out of all my readings is to have a custom gasket made. Please advise.
     
  2. puff4

    puff4 Gold Level Sponsor

    If done properly, there is no need to modify the head gasket. Position the gasket on the head in the proper place it will be upon assembly, tape it down, then carefully scribe a line on the head for each cylinder, indicating the limit of the gasket’s cylinder sealing ring. Remove the head gasket and store safely. Then perform the Vizard mod, using a template (a metal one works best), ensuring you do not stray beyond the scribed lines.
     
  3. bernd_st

    bernd_st Bronze Level Sponsor

    As far as I recall the Vizard head modifications were within the given head gasket boundaries. Oops Kevin was a bit faster...
     
  4. sunalp

    sunalp Platinum Level Sponsor

    I'll be doing this to my 1725 head shortly. You use the stock head gasket to outline the areas to be
    enlarged, and stay inside of that. There is no need for a custom gasket, Kevin has it right!
     
    puff4 likes this.
  5. jdoclogan

    jdoclogan Platinum Level Sponsor

    I appreciate the confirmation of my strategy on this modification. Just good old fashion common sense. Thanks gents!
     
  6. bernd_st

    bernd_st Bronze Level Sponsor

  7. jdoclogan

    jdoclogan Platinum Level Sponsor

  8. bernd_st

    bernd_st Bronze Level Sponsor

    Fine then. You also may buy one of his flow porting books. Excellent stuff. Tuning the A Series Engine was my bed lecture way back in my early Mini Days ( still have it). It made me reconsider many things when building an engine , i.e. not just putting the hottest cam & biggest Weber carbs ;-)
     
  9. alpine_64

    alpine_64 Donation Time

    Vizard always preferences flow and air speed over compression and port size.

    It would be interesting to back to back dtno a vizard and stock head
     
  10. bernd_st

    bernd_st Bronze Level Sponsor

    That's what I'm talking about. If I remember correctly he always compared his results , i.e. modified vs. stock on his flow bench...
     
  11. alpine_64

    alpine_64 Donation Time

    Hi bernd, he always gave results from the flow bench but iirc never actual HP gains on a dyno.

    Of late ive been doing a lot of research and reading on cams, cylinder head combustion shapes, ports and flow.

    Flow on a bench is an indicator but the gains on the bench are often not as beneficial on the engine due to the nature of pulses flows and the restrictions from other elements in the intake and exhaust path.

    By no means am i disregarding vizard or his suggested rootes mods... We have proof there are gains on our motors with his guidance.

    Bernd i should mail you with some of the other info and thoughts on the new race 1600.

    Jerry.... of course to you too!
     
  12. bernd_st

    bernd_st Bronze Level Sponsor

    Of course there are also other factors. Looking forward to your info. Our next Club Journal is coming soon ;).


    P.S. Do you know anybody who has, or can manufacture oversized thrust washers for the 1600 ?
     
  13. Gordon Holsinger

    Gordon Holsinger Platinum Level Sponsor

    Try Rootes parts holland
     
  14. bernd_st

    bernd_st Bronze Level Sponsor

    They have all kinds of bearing shells but no oversize thrust washers. A pity though...
     
  15. alpine_64

    alpine_64 Donation Time

    Bernd. I can think of people in AU that can do that.. But as with the rest of the world.. Wont be open.... And who knows what will reopen in the near future.... :-(
     
  16. bernd_st

    bernd_st Bronze Level Sponsor

    Michael, let's keep it an option once we overcome the current situation. We all have to look forward don't we ?

    Checked the SS catalogue and they appearantly did 0.010" oversized ones - NLA unfortunately. Would be perfectly sized for my current rebuild. If anybody has a set lying around, pls. let me know...
     
  17. alpine_64

    alpine_64 Donation Time

    Ill call a guy here for you that has lots of NOS stuff and aftermarket.. They may have some if you need a stock size like that.
     
  18. puff4

    puff4 Gold Level Sponsor

    Well, you could always bond .010" shim stock, cut to fit, to the back of the washers. They don't take constant load so I'd think this would work pretty well.
     
  19. bernd_st

    bernd_st Bronze Level Sponsor

    Thanks Michael. Waiting your feedback...

    Kevin: A good idea and that's what I'm trying at the moment. However finding metal sheets that thin already proved difficult. Got a sheet of Nickel steel 0.1mm thick and cutted 2 pieces to shape. They can be inserted and reduce play quite well. But didn't find any good glue yet. Overall a bit homemade approach. Oversized thrusts would be the better approach...
     
  20. puff4

    puff4 Gold Level Sponsor

    I don’t have any .010 but I’ve got lots of .005. If you like I can mail you some.

    As for attaching it, I’d use a quality epoxy. It’s not going anywhere once it’s bonded on with that.
     

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