340 max camshaft with exhaust manifolds

I’m not following the rocker ratios. As you post it, .1 makes a 1.5 into a 1.6. Then the .05 makes a 1.5 into a 1.55. This is not a round ratio nearly anywhere.

Overall it is best to ether change the camshaft to suite the new lift and duration as needed or just increase the rocker ratio to 1.6, which is normally the next step up in rockers.

There are odd ball rocker ratios but the system is expensive. Also normally found on 48* heads and not the stock 59* heads. These rocker ls are made by Jesel and are around $1800 just to own the set.

You can also do both tie cam and rockers but this often leads to not what you wanted and not performing at it’s best unless you have your cam, valve timing, piston timing events pre calculated out. Enjoy that.

Exhaust manifolds and camshaft timing for a specific goal require a good bit of for thought and the cams will drastically differ from each other in the simplest of things most people do not out a thought into because it’s just not on the radar.

To aid in discovery, a simple program like Desk Top Dyno Sim will allow you to input your own custom cam timing events on an advertised or @.050 events. Also the type of exhaust, exhaust manifolds are an option. Your goal is the best amount of torque in the cruise rpm you travel at for best mileage results.