Originally Posted by bigtread
I am pulling my 350 out of my mud truck and installing a 454, don't know anything about the 454 other than it runs real good.
I currently have a 4500 stall torque converter in 400 turbo that worked great with my 350, question is should I look at replacing the torque converter with a different stall speed to run 454. I was told that it my need to be lower stall speed.
Thanks for any info
You want the TC to hit at the torque peak, so it will depend on where that is w/the 454. I wouldn't be a bit surprised if you needed a tighter TC, though. If the current TC is stalling at 4500 w/a SBC engine, there's a good chance the torque of the BBC will cause the stall speed to be higher.
But in any event what you don't want is for the stall RPM to bypass the meat of your 454's torque curve and if the stall speed is too high, it will do just that.