Sonicriot13 0 Posted July 1, 2007 Hey guys, Well after some deliberation I have decided to remove the cylinder head from the valver and have a butchers at the gasket and piston rings. Really the only thing I can put the problems down to is poor compression so it's time to stop pussy footing around with things outside of the engine and really get stuck in. Obviously I want to make sure I have all the right tools to hand before I start so does anyone know what size spline bit I will need for the cylinder head bolts? I don't own any myself yet and some sets only go up to 12mm. It's a 9A by the way. Cheers. Joe Quote Share this post Link to post Share on other sites