it could be fuel related because with a 347 you should be getting more mph in the 1/4. maybe you are losing pressure on the big end of the track. i am confused about the timing thing also. that much of a differance in timing should make a big differance in the ET. what did tony have to say about it. i know that tony knows what he is doing.
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91 LX COUPE, 3.73 gears, 2 1/2 inch full exhaust, 1 5/8 shorty headers, 73 MM C&L MAF, 70 MM MAC TB, LUNATI cam, Windsor jr heads, GT 40 intake with ported lower, world class T5 with PRO 5.0 shifter, Griffin aluminum radiator, Fluid Damper, SSM traction bars, 150 HP shot N2O kit, 190 GPH in tank fuel pump with Paxton T-Rex external pump. And more to come.
BEST TIME ON BOTTLE---11.51 @123
BEST TIME ON MOTOR---12.63 @109
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