[greg_moreira]

I have never used a dizzy machine, but cam sweets post got me thinking. If the dizzy was spinning 2800 on the machine to make full advance, the engine would have to be spinning much faster to spin the distributor 2800 rpm, cause the cam and dizzy spin slower than the crank(half the speed). Know what I mean. Get a light and try revving the engine further just to make sure......unless you(or the machine?) has already taken this into account. Like I said, Im not sure about the distributor machines, so it may already be taken into account(the different rotational speeds). If so, than the only other obvious things I can think of right now is that you are right....the gas is either not right, or 2800rpm is too early for any more than 30 degrees. However, it might take more at say 3200 rpm. Its worth experimenting with. Try some heavier springs to delay full advance and then see if it can take more total at a later rpm.