Runing a low gear like the 3.08 doesnt allow the rpm to get high enough to couple. We ran Dizusters turbo car with a 2.76 gear. It ran 10.50's but the slip was as I recall was over 25%. Why? The car wasn't done accelerating. My street car ran a 5300 with a 3.55. Slipped like mad. Felt like it had a V V T trans. Same converter with a 4.30 it drives great on the street. Cam, converter, gear all have to be in sync to drive nice.
Doug
So in this case, would the 2500 stall or the 4000 stall be ideal? Cam company said 2500+ stall for converter giving them all the combo details. Maybe the lower stall would work better as to couple sooner?
Here's your issue, big cam, low compression, high rear axle ratio. Now tring to crutch all that which is a poor fit with a converter. High stall will help crutch the low end. But it'll slip at speed. Its possible that your engine guy is smarter than me. I ran a 8.5-1 360 with a .509 108 lca hyd Mopar cam (I know it's more than 230@.050). 3.55 4 speed. LD 340 , 650 Holley. It was horrible on the street. It was no quicker to 4000rpm than the dead stock 1973 340 it replaced, which was a stone pig. At the track the 360 did manage a 13.50. Swapped in a 220@.050 hyd roller and used .028 shim gaskets to get it to 8.9-1. Everything else was the exact same. It's run 12.70's and runs on 87 swill.
Doug
Yes, definitely not ideal, I know. I want more rear end gear, but I currently drive a lot of highway with this combo, so at most I see myself with 3.55's out back. Im leaning towards the higher stall converter over the factory high stall, and cross my fingers it stalls in a good spot and doesn't slip excessively. This 360 has 65cc heads, the .028" head gaskets, and pistons down in the hole .110" so its right at 8.5:1 with the calculations I made, as much as I would have loved to have more.
