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[QUOTE]Originally posted by Tom Renzo: [QB] OK PSI lets say you have a cam with 1.5 rockers and lets say the PV clearance is .080 > Installing lets say 1.7 rockers you are claiming the PV clearance does not change?? Fascinating as the higher ratio of the 1.7 rockers decreases the PV clearance across the board. Simple math dictates that. Fascinating how people do not use common sense.You might be right but i have made a hell of a lot of PONIES over those 48 years and still in business. By the way what the hell is a 3/4 CAM ? Does that mean it is 3/4 of WHAT?? Thank you PSI. When using roller cams the acceleration ramps are much faster than flat tappet cams. So without messing with certain specks of a cam other than lift you are correct in a way!!! But normally to achieve those higher lifts normally the overlap is effected. And valve events as well. My example with the 1.5- 1.7 rockers clearly point that out. The rockers do not change anything other then the lift events and amounts. So think about what yu are saying and please refrain from insults. Otherwise i just might have to post some photos of my handy work. Thank you PSI!! + Just for kicks. 3/4 cams were normally phrased by the flathead guys and spilled over to the overhead guys. No specks were given on the grinds as i was plotting those cams some time back. It was just a comparison to a stock cam of some lift and duration. The phrase does not tell you any specks on a particular cam. You need to know the stock configuration for comparison. A meaningless TERM in cam specks!! I have not heard this phrase in years! What's a 3/4 Race Cam? In the early 1950's the most popular original camshaft designers were the legendary Ed Winfield, the father of hotrodding, and Cliff Collins of Harman-Collins. If you look a Huntington's 1951 book you will find the specs for their cams listed. We've also listed some of their cams on our Flathead Performance Cams page. There were lots of cam grinders that copied Winfield and Harman-Collins cams, but these two were the designers and innovators in the early days. It was popular to refer to cams as a 1/2 Race or Semi grind and a Full Race grind. Later, there was a call for an intermediate grind between these two. To fill this demand, Ed Winfield took the intake lobe from his full race cam and the exhaust lobe from his semi cam and called it a 3/4 Race cam (see Flathead Performance Cams). It was literally half way between a full race and 1/2 race cam. Since that time, 3/4 Race has become a generic term for a high performance street cam, i.e. something less than a race cam. [/QB][/QUOTE]
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