my car is a 2 litre 8 valve astra ,i built it in 02 , it runs a skimmed ported head,, 270 degree cam ,2.5 inch exhaust ,
it runs only on lpg and uses a msd6 ignition box with timing at 28 degrees .
it dynoed at 140 odd bhp and gets around 25 to the gallon local and 33 to the gallon on the motorway at around 80 to 90 mph .
it uses a hmvl ring and vapouriser kit ,with a 90 litre tank .
regards robert