Right, thought I’d give some feedback on this……
Firstly, the casing is the vertical engine standard from a Stuart 10V, so there isn’t a great mass of metal…ergo if the molds are broken open early, then yes they will cool down pretty rapidly due to the lack of hot material surrounding the casting.
So, with that in mind, I heated it with my medium size torch running propane an my makeshift oven.But, I concentrated the heat mainly on the areas that needed to be machine…
While it was heat soaking, I fired up the bbq starter, like I said above. Once that was well under way, I
It the casting in among the hot coals, topped off with more charcoal and left alone.
It soaked in heat for about 5 hours and gradually cooled over that time too…..
This afternoon, I machine the top flange ready for the cylinder…….What a difference….!!
So, thanks for all the advice guys, something else I’ve learned…( another use for the bbq….🤣🤣)