Gee, had a '68 SS 350 myself back in the 'olden' days....
Rhoads lifters cannot change the compression ratio. What they CAN change is the effective cylinder pressure at lower RPM's.
The Rhoads is a "fast bleed down" lifter.
Just my opinion, but I would give it a try. What you're lacking is low end torque and the Rhoads should help you there by reducing the "effective" duration (@ .050") at low RPM. To what extent would depend on how they're adjusted. By that I mean that zero lash + 1/2 turn would bleed down quicker than zero + 3/4 or 1 turn. (does that make sense?) This is a lot like a solid lifter cam where you can change the power curve slightly by changing the lash.
It's certainly cheaper and easier to do than changing a cam, converter or gears. Go for it.
PS: I think Crane still makes a variable duration lifter also, but doesn't bleed down as quickly as the Rhoads.
Last edited by RaggMopp; 03-10-2004 at 03:43 PM.