I've been splitting down the engine ready for the work to be carried out to the bores to allow the +30 Pistons I have. When removing the sump I noticed grey type paste / sludge in the bottom of the pan , wondering what this could be. Also looking at the cylinder bores they looked to be sleeved is this normal and will it affect the rebore. I have bought the later type 1300 big valve head , which I will have reconditioned at the same time. Are these valves a good size or could you fit larger. I want to retain the 1300 engine (+30). But would like to have a bit more uumph. + 30 , larger valve head , tubular exhaust , 1 1/2 su s of the 1500 and Kn filters . After a bit of forum searching I think that the standard cam is quite good as long as it's in good order. Hoping for around 90-95 bhp. By the way what cc would +30 be on the 1296 engine.