Why not a G5X2, 3 or 4? and a set of PRC heads?

 

Yeah, I'm spinnin my 216/220 up to 6400 RPM, I think I could go up to 6500 but thats about it. I'm soon to upgrade cams too, but I'm gonna keep it under 224 intake and exhaust. Maybe stupid question, but I have seen equal duration cams, split duration, and then reverse spits. What the benefits between the three?

Oh yeah, sorry to butt into the thread Flyer, but this is been a question on my mind for a while.

 

No problems ... good question. As far as I know, the single pattern's are a bit more daily driver friendly, where the splits are a little racey like, the more the split, the more racey, but I could be dead wrong, it's happened before.

 

You should match the camshaft to the setup, mainly head flow vs. rpm. If you got a shitty flowing intake path, you can crutch the intake by giving the setup more intake lobe which in return aids cylinder filling.

If the exhaust can't flow, crutch the exhaust by adding more duration. This opens the exhaust valve sooner and closes it later compared to a smaller exhaust lobe.

The benefits are when you match the camshaft to the head flow vs. rpm as mentioned.

Divide your exhaust head flow into your intake. This gives you a percentage referred to as your E/I ratio. This ratio varies across the lift range. Take a 5.3L head. At .05'' it starts out at about 88% and then by .2'' your nearing 69% E/I.

Neither ratio dictates a strong flowing head. A low ratio 60's may mean your intake flows super duper or your exhaust is crappy. A high ratio (80's, 90's) may mean a well balanced head flow or your intake is not up to par.

What I'm getting at, is the benefits aren't by name (reverse, standard, single) it's when you match the setup correctly. There are some reverse pattern camshafts out there that start off as a standard split, by .05'' they are single pattern, and then at .2'' they are reverse. So, be careful when you name a profile because it is single pattern, reverse, or standard at ONE given lift value.

Example. What kinda camshaft is this? 230/230 .59/.57... More than likely all 3 names fit this one profile. At higher lift values it turns into a reverse pattern. At advertised duration, the exhaust lobe is larger.

 

ok say u have a truck with full exhaust and just a k&n cai.. and i dont wanna stall what cam do you choose...this is gettin way complicated..thanx

 

Sport Side,

No, you pretty much answered the way that I was thinking, just wanted to confirm that my theory was correct.

 

There's no one answer for that. Give this scenario to Vinci, TR, TSP, FMS, Cammotion, LGM, and HPE and I'm willing to bet every profile they recommend is different from one another.

So then, your faced with 7 different camshaft profiles. Which one is best?

One problem is that your going to have to be way more specific. What operating range, what motor? Gears? Tranny? Heads? Rockers? Goals? The more specific you are, the better the recommendation is going to get.

 

well i said that i want to keep the stock converter..so 2000-6000, my sig. says 5.3l, auto, 3.73, factory heads factory rockers and i want to run a high 13 in the quarter..is this possible? and its goin to be N\A.

 

what's the biggest you can go with stock springs?