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It seems that every magazine article on cam installation they seem to advance the cam 4 degree's . I've always set them straight up per manufacturers spec. What power potential would be gained by advancing the cam.
Quote:Both valves open sooner and close sooner in relation to TDC of the intake and exhaust strokes, if I am remembering correctly
Typo?
Intake valve closes sooner.
Either way advancing the cam, moving the intake lobe center closer to TDC makes more torque at a lower RPM and moves peak HP lower in RPM also, you gain bottom end and loose a little top end. A lot of the cam grinders will spec a cam with four degrees advance built in, say the cam is ground on a 110 lobe seperation angle and they will have you install it with a 106 intake lobe center 
So straight up off of the cam card could still be 4 degreees advanced
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Typo?
Intake valve closes sooner.
Quote:both my engle cams soild and hdy were ground 4 degree advanced.
Also alot of cams are ground 4 deg advanced, so when you install it straight up its advanced 4 deg. I called Comp Cams and found this,at least on the one they sold me.
, the cam card will say @ what CL the cam should be installed (if 112 lsa then they want it installed @ 108), is this what you're asking?
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Nice post, thanks- My goal is to carry as much torque to 7k as possible with 12 to 1 comp my comp solid roller [Email]260@.05[/Email] 106 on 106 is a little too peekey , good @ 55 to 6k but falls flat by 6500 with big mud tires , the 280@ .050 107 0n 103 doesent have enough @ 5500 I think its too much duration for 12 to 1 trying to pick a cam in between around [Email]268@.050[/Email] but cant get a grasp on lsa the 108 will still be peekey I think so I was looking at 110 and advanving it 4?
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In mud racing you need all your power in asap , we only go 200ft , we went from a 38.5 x11w rear tire to a 38.5 x 15w and slowed the truck dowm 2,5 tenths , the wide tire launches better and truck handles a lot better, the problem is in high gear there is a lag in the rev to 7k , engine hits 6500 instantly with the wide tire , with the skinny tire we hit 7k instantly , trying to cam up to the best cam for my rig hoping to correct the power lag , 7k is all the wheel speed I need with tire dia and gears, I know I need a little more duration maby 265 to 270 range but trying to widen power band also thats where i am having problems with witch lsa to choose.
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Wow , thats going the other way than I was thinking, The older I get seems the less I know, Thanks again for the leg work , what kinda hp & torque numbers were you seeing?
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I was guessing that he could have used something like
a 112 lsa, installed at 104-106 and just a little
more duration, something about 286-290... just a guess
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The only program I have is the freebe from cam quest <comp cams> I was getting numbers close to yours , My buddy has desk top dyno and the numbers were 75 hp lower , I allways thought this was around a 600hp engine , we have run with and beaten guys with dyno sheets over 700hp in trucks close to the same weight, I allways thought I was just lucky?
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With the big cam we run a 1050 on a 2" spacer , small cam we went down to the 850 bg ,the bg guys say that the 850 will flow over 1000 any time any where? You are showing a major gain with your cam choise , a 104lsa just blows me away on how my mind isent grasping the cam timing thing , with a 104 lsa means more overlap , with my fender well headers at a low idle around 1000 rpm the 106lsa will just about suck your shirt off if your close to the header, at 104 lsa I might be sucken down low flying birds, might have to put a screen up or something?
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Hey I see where your going with the 104, went on cam quest and went with a chebby , comp has lots of cams for chebbys compared to mopars, can play with specs more, the torque is coming from early intake closing with the tight lca and the hp from the long duration in upper rpms?