roller rockers

Bill Harris · 12-22-2011, 06:41 PM

Guess I'm a dumb-*** but why would the exact rocker ratio matter to NHRA tech? The lift at the valve would seem to be the important spec, so measure at the retainer and if it is in spec, it is good. The amount of machining needed to use a significantly different ratio rocker on a particular engine to maintain the geometry and have pushrod clearance is probably illegal anyway.

Anyone who has measured the OEM rockers know the last thing they have is an accurate ratio. Measure 16 of them and your probably going to get 16 different numbers.

It's sort of like the rod/piston/pin issue a while back. The total weight of the assembly is the guide so you can have a little lighter piston with a little heavier pin or rod, etc, as long as the total weight is good, it's OK.

12-22-2011, 06:41 PM	#37
Bill Harris Member Join Date: Mar 2002 Location: Ooltewah, TN Posts: 421 Likes: 13 Liked 26 Times in 13 Posts	Re: roller rockers Guess I'm a dumb-*** but why would the exact rocker ratio matter to NHRA tech? The lift at the valve would seem to be the important spec, so measure at the retainer and if it is in spec, it is good. The amount of machining needed to use a significantly different ratio rocker on a particular engine to maintain the geometry and have pushrod clearance is probably illegal anyway. Anyone who has measured the OEM rockers know the last thing they have is an accurate ratio. Measure 16 of them and your probably going to get 16 different numbers. It's sort of like the rod/piston/pin issue a while back. The total weight of the assembly is the guide so you can have a little lighter piston with a little heavier pin or rod, etc, as long as the total weight is good, it's OK. __________________ Bill Harris ex 2172 STK ex 2272 S/S