I use Nitrous. I retard the timing 4 degrees for every 100 shot. I run a separate fuel pump at 5 p.s.i. It is a lot of fun.

A local guy had a Camaro, spent thousands, he ran 13.1xx. I had a stock 85/305 Z28 with 160 hp. auto that I paid $500 for which ran mid 15's. I challenged him providing I could strap on nos for the evening. I tuned it for 225 shot.

I beat him by several lenghts.

Key is lots of fuel supply, colder plugs, and retard the timing. I use NGK with a 4 rating as standard. For every 100 shot I go a one number higher rating. So for a 250 shot I would use a 7.

All other name brand spark plugs have the ratings in reverse numerical order.