My 1969 Camaro (383 w/ Edelbrock RPM Package-including heads-, 350 turbo, and 3.42 gears, MSD Box, Electronic Ignition, Electrict Holley Blue Fuel Pump) has slowed down.
It normally runs very consistent 12.8 to 12.9, depending on the weather.
Last week it ran 12.96, 12.96, 12.94, and then ran a 13.15 for no apparent reason. No spin, no missed shift, and the weather got better. I figured I must have missed a shift and blew it off.
Took it back to the track today and it went 13.25 and 13.35. All the times (60ft , 330ft , etc) are slow. I have lost 4 mph at the quarter mile.
The problem is I don't know why. No ticking, no pinging, timing is at the same spot (35). Secondaries are still opening on the carb. I changed the plugs before I went racing last week with the same brand and type.
What do you guys think? Fuel filters maybe? Bad Plug?
Thanks for the help. I'll keep everyone informed of the progress.
69 Camaro w/ 383 Edelbrock RPM System (including heads),
Nitrous, 350 Turbo, 3:42 gears
12.83 on motor, 11.91 with 125 hp shot of nitrous