I would not rely on a stock mopar BB block with anything hyd. for performance unless you bush the lifter bores for proper oil control, hyd.rollers can be noisy/they are heavy/high rpm can be a problem unless you run them down almost as a solid and I don't think the spring pressures they give are adequate for proper operation. Or just put s/rollers on it. What you are building is a bracket engine so go with parts that make it so, go solid roller. Hyd. rollers work fine in chebbies because the blocks were designed for them with taller lifter bores, mopars were not.


A friend has a '69 RR, 50/50 street/strip car, drives to the the track and to shows, 4.500 stroke BB wedge, runs a mild .625" 260/270@.050 s/roller, springs are 195/600lbs open, been like this for 2yrs, no issues, has spray bar oiling, as said don't idle it too low or for too long. Forgot to mention its a race built 727 with 4200stall verter.