I posted this in here because i thought it would get the most views. I appreciate the help you guys have given so far. With that being said......I have a 66 nova chassis car wiht a 461 12:1. holley heads, solid roller cam. Powerglide withe a 5.00 gear, 33" tall tires. 60' times on car are soft i think with a best of 1.48. It is a 9" converter though. Would switching to a 8" converter really help out in 60' and ultimatelt ET? I was thinking the rotating mass would be less, hence letting the motor rev quicker and making the transmission more efficient. Does this sound reasonable? I know ive seen similar combonitations to mine with a higher gear running 9.80's-9.90's. It has ran a best of [email protected] at norwalk, running through the traps at 7100rpm, 4600 launch. Cam is 270-280 duration .714/740 lift. Thanks for the help? Any other suggestions?