Mark can be difficult to get hold of - I have a telephone number for him if you need it. He is acknowledged as a guru when it comes to the V8. When I met him he was running an immaculate red Sierra with a v8 engine. He did the work on my plus four and transformed it. It appears that Rovers timing was very conservative and Mark found that by advancing it he gained 30bhp with no other modifications bar filter and manifold. He is the man to talk with.
