393W not running up to expectations
I’m updating a way old post regarding an old 393W build post. After helping building it, putting it in the car, and taking it to the drag strip, we were a little disappointed. It only ran a best of 11.79 at 114 MPH. On paper, we thought it would at least run mid-to-low elevens. He is the set up;
• 393W; 850 Quick Fuel carb, Victor Jr & one-inch open spacer, .030 flat top 10.6 to 1 (cranking compression is 170 PSI), World Products Sr with moderate porting for the 2.02/1.60 valves, Lunati solid roller 253*/256* @ .050”, .621” in/ex on a 108* lobe separation +4*, 1 7/8” x 3 ½” headers with 18” collectors, deep oil pan modified with a windage screen, and a complete -8 AN fuel system & pump with a -10 AN pickup,
• The 351W it replaced used the same components as listed above and ran 12.09. Again, it too should have run quicker.
• ‘69 Cougar with roll bar and sub-frame connectors
• Car & driver 3300 lbs
• 4000’ish stall in a C-4 with a manual valve body
• 28 x 9 slicks
• 4.30 rear ratio
• Car launches well, pulls the tires off the ground, shifts at about 6300 and pulls through the traps at about 6200. This is a drag strip only car and I’m sure it has the potential to go faster. It has no hic-ups, surging or anything; it runs great! What are we missing?
Racing Cougars (the other Mustang) for three decades...