Hi Mic I am building a howell V 4 any chance i could get a copy of your drawings for the manifolds i cant make out all of the dimensions in your post online Thanks Randy
rio1 you have to use tool wrap which is .002 thick stainless steel you can get it in a roll or in a bag you place your parts inside the bag ,wrap the parts in paper place inside the stainless steel bag seal it up then place inside the furnace .
Something I always did when heat treating rings is to wrap them in tool wrap and paper inside the wrap the paper burns out the oxygen rings come out real clean .
That is why there is a fixture in the plans to put the holes in after the head is screwed to the cylinder or the threads would have to be clocked or timed with the holes. Randy
Pros of Lexan:
Can handle temperatures up to 240 degrees Fahrenheit. Highly resistant to acids and other chemicals such as gasoline.
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Lexan vs Acrylic: Difference Between Polycarbonate & Acrylic