I built a 83 Tbird Tc with a 97 Explorer motor,t5 and a 8.8 w/3.55 gears. Car is light for a TC but havent weigh it yet so Im guessing a race weight of 3300 with me in it.
Here is the motor I built.
Shortblock is a fresh stock rebuild
Untouched P heads with Alex spring upgrade for .550 lift cams
TFS stage 1 cam
BBK 1 3/4 long tubes
24lb FMS injectors and a MircroSquirt from EFI Source Im tuning myself.
Car has a 2.5" Y-pipe into a 3" single full exhaust. And I have real 17" street tires on 93 Cobra wheels. I didnt build it as a race car so I know my tires and gears are killing its full potential but I really thought it would MPH better than it does.
On tow different days it ran almost identical passes. Here are my two best slips.
2.09 60ft 13.93 at 102
2.16 60ft 13.94 at 102
im holding 3rd gear through the traps and crossing at 6200.If I short shift to 4th it drops 3mph every time but still runs in the 13.90s
So what IS a good mph for a mostly stock GT40P motor? I see a few guys on here pushing past 110mph with not much more motor than me.
I guess I was thinking it would be closer to 105mph and Im hoping maybe its low just because of the gear choice.