My plan was to make a plasticine head so I could see how much I can remove rather than just attack the actual heads with a die grinder and keep my fingers crossed, I realise it won't be accurate but hopefully it'll give me some idea if I can remove enough metal. Or if thicker gaskets would do the trick.sidecar wrote:Personally I would not use clay or anything like that when trying to work out the chamber volume, just use water and a plate of Perspex, you also need a burette, you can get plastic ones off ebay fro a few quid, I have a glass one and I can tell you that you only have to look at them in a funny way and they break!
You can also burette the pistons at TDC, use some grease around the top of the bore to seal the piston. Finally once you know the head gasket thickness its just some maths the work out the CR.
Before retiring I used to work in a lab and yes you're right, you have to be careful with glass burettes especially if they've got a glass tap.