So what am I looking at exactly

DesertRat said

I don't know 340's but weren't they born hydraulic lifter with stamped non adjustable rockers?

Click to expand...

1970 T/A 340s - Adjustable rockers with hydraulic cams.

All other 340s - Stamped steel rockers.

(the 273 rockers & 340-6 rockers are different & not interchangeable)