Your call but



This is from Hot Rodding

Quote:


The rocker arm mechanically multiplies the cam's lobe lift. It does this by moving the pushrod closer to the fulcrum pivot point than the valve stem tip is. A simple example would be: if the valve tip centerline is located 0.750-inch away from the rocker fulcrum pivot centerline, then a 1.5:1 ratio rocker would have the pushrod cup located 0.500-inch from the pivot centerline (.750/1.5=.500). When you increase the ratio to 1.6, you obviously can't move the valve or rocker arm stud, you have to move the pushrod cup closer to the pivot centerline. So, now the math (.750/1.6=.470) tells us that the pushrod centerline is roughly 0.030-inch closer to the fulcrum pivot. This arrangement does more than just multiply cam lift. It also multiplies the loads on the pushrod, lifters, and rocker arms, making the proper ratio critical. Too much ratio will open the valves too quickly and can cause valve float at high rpm. It also multiplies the spring pressure seen on the cam lobes, so running too much ratio can wipe out a flat-tappet cam in no time. Thankfully the cam manufacturers have studied these problems and most won't even sell you too much ratio



If you want to use the 1.7 rockers you will need to grind it.

Allen Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first. Life was a little easier when I was just a wrench.