Originally Posted by ap72
a bigger cam requires a taller gear.
Betcha you didn't mean to say that.
TI and I have "spoken" w/each other, so he'll know this is not intended to dispute him. I'm adding it as a point of reference only.
Originally Posted by techinspector1
A 3.08 rear gear will put the final drive ratio at 2.15 and I doubt that anything less than a big block would pull that gear.
What I know as fact is that I have a 1980 Malibu wagon with one of the weakest v6's to come outta GM (229, or 3/4 of the crappy 305).
The final drive is a 2.29:1 (7-1/2 diff) w/a 350C (lock-up) tranny.
It will drive all day at whatever speed you choose, as long as it's not over 108 MPH. 20 mpg, at 65 or 85, doesn't matter.
On a GOOD day, that engine might make an honest 130 HP.
All this is to say that I believe there will be no issue w/a SBC pulling a 2.16:1 final drive (3.08 w/a .7:1 OD).
As soon as you accelerate when at highway speed, the tranny doesn't stay in OD locked up, anyway. It pulls back to 3rd. (3.08:1).
Is it "ideal"? No, but it certainly will work.
For comparison's sake, 3.73's gives you the equivalent of a TH350 w/4.53:1, in first.