60ft: 1.88 1/8: 8.6 Just wanted to share this pic with you guys. I won't bother too much going into engine details because they are not really trad. or custom, but I can say the car has a traditional longram intake system on the motor, originally available on the Chrysler 300 "F", and some other Chrysler Corporation cars in those years. I had a driveshaft imbalance in the car which prevented me from going 'all out' for the entire quartermile unfortunatly. At around 70mph I had to back off the throttle slightly as the driveshaft-vibrations came in pretty bad at that speed.
BBM..not to say its not the driveshaft..(it very well could be) I have a 68 Mopar with a 440 in it pushing some nasy H.P. (now sitting for more attention)..i had some vibration that i thought was driveshaft related, turned out the Torque Convertor, was not balanced. and it was just enough that it tried to shake my mopar apart at elevated speeds. It never produced the vibration under heavy acceleration, only when getting out of the throttle or driving it "easy"..(normal everyday driving)..just a thought for you to look into.. some cranks need the balanced convertor, some dont, cant remember how this goes but, mine was obviously in need of the correct convertor,it solved the problem
Castcrank bigblocks (mostly '73 and newer) need a externally balanced convertor and damper. All steelcrank motors use neutral balanced dampers and convertor. (There are one or two exceptions to this rule when it comes to SixPack engines I recall) In either case, as mismatched convertor (or damper) should also 'show' itself when an engine is revving in neutral since the convertor is connected to the crankshaft all times. The driveshaft-shop who made me the entirely new, but sturdier shaft made the small mistake of drilling the 4 flange-boltholes slightly offcenter. Since their balancing-machine probably grabs the outside of the flange, the resulting imbalance never showed up on their machine. Another nice little tidbit is the 'importance' of not running inner-tubes in your slicks when you have a lot of torque and grip AND not using tire-screws in the wheels. Note the marker on the rim and tire, this happened after just 1 run...
The Jalopy Journal
