Hi Simon I believe Newman Camshafts in the UK, who incidentally make cams for most other UK parts suppliers, will cross drill any of their XPAG cams. I run a Bibby Profile Supercharger cam cross drilled and after several years of hillclimbing is still in perfect condition. I use it in combination wi...

I run a supercharged XPAG bored +140 with a Laystall cylinder head. To keep the compression ratio under 8.1 i use an aluminium decompression plate 0.9mm thick together with a standard copper head gasket. I know aluminium against an ally head is OK not sure about iron. These decompression plates are ...