Roland,
4 of the 9 vipers that I drive with are GEN 1 cars. Only one has been shipped of to Arrow for a rebuild TWICE! Sean Roe's.
Some gen 1 years are prone to head gasket leaks, due to bad designed head gasket. Now there is a new and improve gasket for gen 1 cars that fixes the problem.
The engine went to arrow once for complete rebuild due to head gasket leak. comes back with a full 1 year warantee on engine, if extended warantee is about to expire. The problem was they put the the old style gasket back in the car, (OPPS!!)and about a month before the 1 year arrow warantee was up, the head gasket leak was back. Went back to arrow for second time, he just got it back and on the road recently.
Give Sean a call, he is an expert on this, and other areas also.
877.ask.sean
www.roeracing.com