Your 414 runs with thier 632,s You gotta love that, mike

.... Yep... never underestimate a Mopar small block ....

In an old 'Crane' catalogue I have here it states that going from a 1.5 rocker to a 1.6 rocker the engine will get the same benefit as going to a cam with 3-4 degrees more duration. I can't remember exactly how it was worded but that was pretty much what Crane said. And the other thing is the engine doesn't know or care what duration cam it has it only 'sees' the valve opening and closing, and if it sees more lift earlier like you'd get with a better rocker ratio then its happier!

Well all good things do come to an end, As I paid for several rounds all that I could think about was I was helping trash the few remaining brain cells the knuckle heads had left , So tonight's argument was how the big block chevy was the best V8 ever ....I was gona try to explain the 454 had a poor rod ratio for a starter but I stopped myself .....Thank God the Ford crowd jumped in as I headed for the door.... This is proof that drinking can be a bad habit.

you need to ask those guys when was the last time they ran big block chevs in top fuel or funny car.

.... at this point I would rather swim around the planet... find a cold Fosters and talk Mopars I will find out what happened with the Ford guys Fri night, the conversation was getting kinda heated when I left

Well its seems that buying and leaving early was a good move... The Chevy guys out numberd the ford guys by 2 to 1 but the fact that Chevy never built a factory hemi lead to all of them getin tossed for 30 days Now I wont have to swim to grab a Now who was it that built the first hemi

good topic, but 340b5 please share that math on here how you go from say a 260 duration to more duration with rocker ratio. I would like to see the actual formuls. All I have seen is volume increase from the extra lift. thanks.

My on this is that the motor is stupid, it doesn't know what the cam lift or durtation is, it does know how long and how far open the valves If you change the rocker ratio only(don't touch or change the cam) the motor will see the changes in valve action, it wlll make more or less power depending on which way the ratios are changed. I have seen this at the valves when changing ratio, try it sometimes I set the lash at zero and measure from .001 begining opening to .001 before closing, take your time and write the results down,net duration and net lift Change the rockers to a different ratio and do it again Don't be suprised if there is a vareince in results on the same set of rockers