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I recently picked up a manual VB race prepped 1.76 PG for my car. Long story short, I broke my TH400 for the 3rd time and decided to try something different. At about 3240 race weight, I know my car is still a little heavy for a PG but I am planning on going to a full fiberglass front this offseason and will find more weight to gut. That and my next motor, a forged crank 4 bolt 428 will be much more RPM friendly for the glide.
Anyways, this past weekend was our final race of the year and I pushed hard to get the new tranny & converter in (Preacher Tom's old 3800 Coan converter) and a new driveshaft made as well as a gear swap from 3.31's to 3.73's that I had. I was able to make it to the track and we had a 4+ hour delay due to electrical problems. So on my first and only qualifying pass I did a light burnout and more of a shakedown run. The car certainly didn't launch hard, the 3.73 x 1.76 combo had nothing on the 3.31 x 2.75 first gear ratio of the TH400. For my next blunder I shifter way too soon so it took awhile to get the car back in the powerband and I passed my opponent at the line and still ran a 13.82 ( thought it would be slower). Sadly that was the only run as there was another long delay on a oil down and then my makeshift tranny cooler line failed and made a heck of a mess in the staging area ![]() Now for comparison, the last run I did before breaking the tranny, I ran a new personal best on motor, a 12.067 @ 112.90 on a double breakout loss (oops) to the eventual race winner. Though a 1.753 second drop in performance is excessive, it would've been far less if I hadn't shifted around the 200ft mark ![]() Am I asking too much out of my 455 at this weight to really consider trying a glide? The TH400 is at the trans shop now, I'm trading in the lower 2.75 gearset for a stock 2.52 which should work better for hard tire racing 1/8th mile if I go back to it.
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1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
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