Save ya self some trouble & get a hot plate to preheat the 6 banger & when ya start just fill the 2 at the sprue hinge & as it comes up in temp go to the next 2 & finally all 6.
Your alloy should work as is, air cooled.
Also when ya go over to CastBoolits,com look under the vendor section & visit with NOE they have some KOOL tools for casters mainly a source for a good casting thermometer,which I highly recomend some type of so you`ll know exactly how hot ya melt is .
Pick up a long handled spoon & 1# of parrafin to flux with , a small pair of visegrips to add weight to the handles as when the pot is full it tries to float the valve & drips,plus the extra weight helps with drips all the time !!!
Oh yeah a sheet pan to place under the spout to catch over run or drips , it`ll save burn spots on ya table top.
PS . the parrafin will melt qwikly /smoke then flash burn so don`t let it scare ya & I let the dross sit on top as a berrier to air , get a bunch of sprues first then add to the pot while ya take a break, refill/reflux & do it all over again !!!
Remember SAFETY gear PLEASE !!
Enuff for now .
GP
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GP100man
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