I have a 94' ls, in stock form I ran 16.5. About 50k miles later ( 154k now) and a few bolt ons (DC 4-2-1, AEm cold air, UR under drive pulleys and a race cat "Landspeed") i ran an awsome 17.2 . Just a couple of more details to add, I had installed a Fuel pressure regulator boosting pressure from 34 psi to 39 psi. I did'nt get in 4th gear til' about 150-200 feet to the finish line. My first check will be compression, but I dont think thats it , it's a honda. If you have any logical conclusions i appreciate it.