holeshotta

i am new to dragsters coming over from fast 10.5 car. Bought hardtail racetech with 489 chevy on alcohol (1050 rupert) mechanical pump, merlin steel heads, eagle rods and pistons 12.5, 4.25 Callies crank. Hoosier 33.5/17/16 ties with 70 runs. 4.56 gear, NGK plugs gapped at .035. Struggling with consistency.

I am leaving at 4200, ( air shift at 6800) Tires at 5.5 psi and engine around 160 everytime. In good air running 5.05-5.09 ( 1500 ft, low humidity) and bad air fell off to 5.17 ( 70 % humidity and 3600 foot air) Mph 134.5-135.2. short times are varying from 1.12-1.16

are my ET's off? I am varying about .06 from run to run through the day. Previous owner ran same combo 5.03-5.05 everytime. I weigh about 25 lbs more than him.


Anyone have suggestions for tire pressure, launch rpm, timing, etc.


thanks in advance