V6, eh? Sadly, you will (should) use a puller. It's about a .020 press fit on the Chevy motor, but harmonic balancer pullers are cheap to buy or rent. You'll need (3)3/8" X 4 1/2" bolts (fine thread I think) with the puller. When done with surgery, use a wood block under 20 oz hammer to tap balancer back on 'till four threads can be started by hand then tighten 'er up (lightly oil crank first!). Then go have a beer...Cal