Quote Originally Posted by Fastnuf
QUESTIONS How much boost is safe to crank into this engine?

It's kinda hard to tell how much more boost can be safely added without knowing the static compression ratio (or better yet, the dynamic compression ratio) and cam specs.
That being said, I would use the pulleys that give you 8 lbs of boost and slip in the 3.89 gears. Work on reducing your short times. They should be alot better than 1.58. They should be in the 1.4 area.
IMHO, I would not overdrive the blower without having a second keyway added to the crank. I have personally sheared stock woodruf keys and split dampers (including fluidampers). I had a guy who didn't even make it out of his driveway with a stock damper!
the fluidamper are known to crack in hard use with a blower. the ATI are better . a stock damper will not have the right amount of press if used that and it just iron .yes another key should be added but you are splitting the press? so then the press means nothing and you are working on two key ways ?? i think i am going to use a bigger key way on a sbc build i working on now. i will be going to 1/4 key rebroach the crank timing set and damper going to run one key way full length of the crank with a hard key see what happens customer did not want to buy a bbc nose crank for is sbc and i will not cut it for a nother key when it is to small from the go