On 11/29/2011 12:58 PM, Richard Ball wrote:
> Pulled this info off of the Spitfire/GT Magazine website. Scroll
> down to the section on EGR Valves.
>
> http://www.triumphspitfire.com/substitute.html
>
> Apparently it is 3/4 x 24 fine thread which is the size of the 1930
> Ford Model A oil pan drain plug.
>
> The Air rail plugs in the head are 7/16-20 by 1/2 inch long.
For a clean installation, use Allen head set screws (aka grub screws).
They'll seat flush with the top of the head and stay out of the way.
Cheers,
Dave Ambrose
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