Re: exhaust cross over (heat riser) fill
Ron,
I use zinc alloy get from Mc Master Carr supply ,it's the same thing Mondello use to sell.
I melt enough into a steel cup I made from tubing and flat bar w/flat bar long enough to also be handle to pick up and pour with,I usaully block @ intake side and pour from bowl side have to use some sort of funnel some times.
The zinc will probaly out last the heads.
Mike Taylor 3601
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