Rocker Clarification is up!!!

[Grant Eldridge]

We've just been through this upgrade with rockers, pushrod length etc. What we saw was changes in lift at the valve due to the rocker change, but also as we varied the pushrod length and went from break in to full racing valve spring pressure. After sorting out the rest, we had to order a cam with .006" less lobe lift to get back under our allowed lift of .398" on the 325hp 396. You get rid of a lot of deflection going to the new rockers, so if you'd used a cam ground with extra lift originally to get close to the spec, it would be important to check it after installing the roller rockers. Just my 2 cents.......

[X-TECH MAN]

Originally Posted by Grant Eldridge

We've just been through this upgrade with rockers, pushrod length etc. What we saw was changes in lift at the valve due to the rocker change, but also as we varied the pushrod length and went from break in to full racing valve spring pressure. After sorting out the rest, we had to order a cam with .006" less lobe lift to get back under our allowed lift of .398" on the 325hp 396. You get rid of a lot of deflection going to the new rockers, so if you'd used a cam ground with extra lift originally to get close to the spec, it would be important to check it after installing the roller rockers. Just my 2 cents.......

BINGO ! A smart racer right there. Less deflection but more so in more accurate Rocker Ratio. But check what you order. Not all rocker arms are made equal. Some out there are as bad as OEM or worse. Some of the best are the ones you stocker guys are not allowed to use.