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Grant Eldridge · 01-22-2012, 07:45 PM

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.......

01-22-2012, 07:45 PM	#37
Grant Eldridge Member Join Date: Jul 2007 Posts: 124 Likes: 0 Liked 0 Times in 0 Posts	Re: Rocker Clarification is up!!! 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.......