I cant undersstand it, but I have no doubt it will work, Ed Curtis really knows what hes doing

Now as far as my limited knowledge in cams, overlap doesnt seem to be as important on supercharged applications as much as NA for obvious reasons, which allows blower cams to be tame, for example the lingenfelter GT9 cam has -11 degrees of overlap at .050 and im not saying that cam makes the most power but it drives like stock. Choice of overlap I THINK was because I asked for a cam that drives good taking stock stall into consideration, I did change my mind and ordered a 2500-2800 Circle D triple disk which isnt much of a jump from stock stall.

Intake duration as far as I know was chosen due to head flow (intake vs exhaust) and my special requirements, for lots of high-end BUT as an average regardless of PEAK power, since im after performance and not just a number.

Exhaust specced for a longtubes, no cats, direct mufflers dual 3" exhausts to the back.

lift probably has something to do with my stock LS3 heads.

I still dont understand the cam however. Why do you say long durations arent a good choice for bigger motors and trucks?

 

Well the other part we need to know is what you asked for...

Big duration is fine for big engines, but most blower setups typically want strong mid-rpm performance, and this cam is a little big for that. But since you want a strong top end it will be fine. I dont agree on the reverse split for LS3 heads, and especially with a supercharger.

 

Probably because truck usually go with low duration cams for under the curve torque. Just cause they are heavy.

So is it an internet myth that you want close to, or under 0# of overlap when running a forced induction motor? Won't some of the boost leave out of the exhaust port with overlap?

 

Its important to remember you dont necessarily want "boost", you want airflow.

 

Well, I think the low durations are due to the small (in comparison) motors vs my 427, then there is compression ratio, boost and so on. The long intake duration on my cam will make the motor loose some dynamic compression ratio compared to my current "baby" cam, but im also turning up the boost 2PSI along with other changes.

Also my truck is pretty light I can tell, and with the 4.11's its got and a 6l80 I go through first gear in a blink lol, stepping down to Richmond 3.73 + torque converter vs my current Motive 4.11 (was told the Richmond was a stronger gearset for high HP).

again based on my limited knowledge, whats nice with a blower is you can get away with a cam with zero or negative overlap and still make power while retaining stock drivability, with that said a blower cam with some overlap will still make more power because even though some of the airflow is escaping the combustion right out of the exhaust valve it helps scavenge the exhaust better.

 

glad I posted this thread cause I think I found a mistake in my cam card >.< will update this thread tomorrow.

 

Any update?

 

Found this, may help understand the reason for a reverse split and if it is right for you.

The main point of a reverse split cam is to hold pressure on the power stroke longer before opening the exhaust valve. By doing this you can gain power in an application that has relatively low compression and a freeflowing exhaust. By low compression I am talking under 11 to 1.

 

Actually turns out my cam has a regular split and the intake duration number was mis keyed in the cam card!!

224/240 .607/.607 LSA114 are the correct specs!!

Makes so much more sense now lol

 

I agree! well said and ayousef you are right too some overlap is/ could be usefull with the right combination.