Very extensive and helpfull reading.
Now I feel like im back at school again!!
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Especially since they are closed.dwg86 wrote: Personally I would stay away from crane. .
dwg86 wrote:Have you already bought the 1.7 rockers? If you did,I think that is going to limit you on cam selectionfor a preground cam like comp, Lunati, or crane. Personally I would stay away from crane. Some of the newer Comp and Lunati VooDoo grinds have a pretty big lift with a 1.6 rocker.
dwg86 wrote:If you have a 110 lobe centerline and a duration [email protected]. You should be good. If you have a 110 centerline and say 220 dur @ .050 that might cause a problem (for the computer, not for a carbed car). I wish I could draw a picture on here. OK try this link http://www.chevyhiperformance.com/techa ... to_02.html This shows how the lobe separation and duration work together forming valve overlap. If you talk to a cam grinder they will lead you in the right direction. You may even figure out that the comp cam will work. I don't know how much valve overlap is good for low end torque and high vaccum.
I know the Mopar 30AB cam has a 108 lobe separation, 200 [email protected] and a valve lift of .453 with a 1.6 rocker. That would be 481 with a 1.7 rocker. The valve timing events @.006 are int open 26/intake close 54/ex valve open 62/ex valve close 18. That is with the cam 4 degree advance. I bought one of these cams and had it profiled at Reed. I sold it to mgardiner1 on this forum. He said he had 17 inches of vaccum at idle, and has no problem running on his computer controlled fuel injection. I think his jeep is a 1991???
So even tough the lobe separation was 108 the duration was short enough keeping the valve overlap from being excessive.
I hope I'm not confusing you. I am trying to help...really!
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