Take it off and clean the area with wire brush, chisel, etc. but don't use abrasives (grinding wheel, flap wheel, etc.) Preheat the part and weld/peen a bit at a time, keep the preheat going. When finished do the preheat again,peen weld and surrounding material, then cover the entire manifold with dry sand (immediately) give it several days to 'chill-out' and you'll have a good repair. Get a box or pan big enough to hold the manifold and the sand ready ahead of time! I've fixed cracked heads like this using an arc welder and high nickel rod. Preheating was done with an insulated cover equipped with cal-rod elements over the the head (the preheat and cool-down MUST be uniform! A rosebud can be used but remember - the piece must be uniformly heated and cooled which is why sand is so good for the cool-down). 8)
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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