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I'm new here and I need help.  I'm building a pig roaster out of your ordinary 275 gallon tank.  Got it cut, strengthend the perimiter, long piano hinge on the lid, etc….  I am planning on putting a rotisserie as well.  I have a half hp motor (1750) RPM, bolted to a speed reducer 200:1, little sprocket to big sprocket on the spit, I calculate it to be between 3 and 4 rpm's.

My problem lies with the height of the pig from the fire below.  I have made the spit adjustable in height from the outside of the cooker.  By doing this, the hole on each side of the lid will have to be very large to allow the lid to close down around the spit wherever the height of the spit may be.  My question is do I need to make it adjustable, and if so will the large holes on the side let out too much heat and or smoke?

I'm planning on using this thing as a traditional grill as well as turning chickens, turkeys, ribs or whatever else on the rotisserie.  I can send some pics if anyone needs to see them.

Thanks!