Under the tech section on camshafts I saw the following information for camshafts for my 1989 GTA 5.0 Liter 5-speed. A rocker arm ratio of 116/-118. I thought rocker arm ratio's were expressed as ratios such as 1.5:1 or 1.6:1. These figures look like degrees but I am not sure. Also, does anyone know the cylinder head flow ratios in CFM at .1, .2, .3, .4, .5 & .6 inches of value lift of a stock 5.0 Liter head. I am trying to determine if going from a gross value lift of about .48 inches with my camshaft to the low .5 inches with 1.6 ratio rocker arms would be beneficial. It may be the flow characteristic of these heads fall off significantly after .48 inches. Of course the higher rocker ratio would open the valves faster at the lower lift ranges.

 

Your 5.0 should have 1.5 ratio rockers. I changed mine to 1.6s when I had the 305/5-speed. It is a pretty good improvement. Works well with a AFRP and exhaust.
FBird

 

Did you have to modify the inside of the stock valve covers? When I got my rebuilt engine from GM it came with these ugly valve covers and I am considering acquiring the stock valve covers.

 

I used the stock covers. I'm actually still using the 1.6s w/stock covers on my current heads. Still running strong.
FBird