Well I got a quote from Graydon Casting for £79 Inc VAT.
I decided too keep it simple and forego the internal core and machine out the internals instead.
Took 1 month from paying invoice to receiving casting as per below
Hi I am from Weymouth U.K.
I have built several 4 stroke petrol engines from commercial castings, Wallaby,Mastiff & sea lion which run successfully.
I’ve now designed my own 30cc inline 4 cylinder OHV engine. I have taught myself basic Freecad (very frustrating) and 3D printed the plugs for...