I'm going to be dyno tuning a customers small block Chevy tomorrow I fixed some problems in it including having the crankshaft machine for dual keyways , I replaced the camshaft, lifters, valve springs, rings, bearings, thicker pushrods and so on. I did have the BDS 6:71 blower gone thru and upgraded by Littlefield so it will lmake a lot more boost than before, 7 lbs max with 6 % overdrive at 6800 rpms. I could spin the blower drive pulley by hand and it would spin one or two revolutions by hand after letting it go with a good twist The block is a stock GM four main bolt production block bored to 4.030, the crankshaft is a forged steel stroker, the stroke varys from 3.745 stroke to 3.750, it is suppose to be 3.750 on all of the journals, 383 C.i. I guess we Mopar racers are not the oly ones that get parts to race with that are less than perfect The mechanical compression ratio is 8.49 to 1 and the cam is [Email]264@.050[/Email] on the intake with .715 net lift and the exhaust is 276 @.050 with .685 net lift and 113 LSA installed at 109 intake lobe center. The heads are a set of aluminum Canfield 23 degree heads, I don't have flow figures and I don't speak Chevorlet so as far as flow # The blower will be ran at 5 % underdribve at first to see what boost the blower will make now and then I will try direct driving it and finally, if it last long enough I will reverse the upper and lower pulleys so it will be overdriven 6%. The three pulleys are two 37 tooths and one 35 tooth. the carbs are a set of 850 CFM Pro Systems blower carbs, the ignition is a MSD 7AL2 with the appropriate coil for that ignition. I will probally start with 30 degrees total timing using 111 octane race gas and go from there to see what the motor wants. So take your best guess and I will post the results as soon as I get done tweaking the motor, probally on Monday evening BTW, this motor ran 6:60 in the 1/8 mile (2500 ft. ltitude) at 105 mph in a 1970 Nova that is stripped out before it stripped the crankshaft keys out of it, probally wieghs around 3000 lbs with the driver ready to run The closet guess gets to be the best guesser See my last post at the bottom for the update