So how does the cam in my sig sound to you for my heavy truck and the idle characteristics that I want.

 

01slow, it looks fine to me for your plan (who am I though), it'll be lopey or cammy..which seems to be a characteristic you want. nothing wrong with lope...mine has good lope to it and it's a 6.0 with the same duration as yours. Good duration and you have a high stall to take it places. Do you have a plan of attack for what rpm range of power you want? I guess with a 150shot you'll be looking for the 6500 area eh? Whats Richard's opinion of the next step up in duration say maybe 226intake and 230exhaust? I am just curious, especially with your intentions of high revs. That'll definitely make for some lope though. (not as much as flyer's though)

 

I trust Richard and if thats what he recommended for his heads and what you want from a Cam, I'd be willing to bet it's on time.

however, sometimes what people think they want, and what they can live with are two different things.

 

here he here he

 

The lower the Lobe sep. # the more overlap you will have, thus a rougher idle. The more overlap, the more peak hp you will make. The wider the lobe sep. the more broad the tq band and the better your motor will respond on N2O. And with the massive lbs. you are hauling around, the broader power band would be more beneficial, yet with the 3400 stall, low end tq won't be as big an issue. Look at some cams for older model motors, since there are so many, and notice the trends for what they recommend for nitrous and weight.

 

Im looking for a cam to top out at around 6500 I dont want to spin this thing up to 7000. What would I really benefit from by stepping up the duration just a little bit?

 

I personally wouldn't go with more duration than the 224/228 you are looking at. The LSx motors head flow is so much better than the older small blocks. You don't have to have as much duration to get equal power at the higher rpms. With more duration the air flow efficiency goes up at higher rpms and drops at lower rpms, thus causing a rougher idle. The choppy idle is caused from the intake charge of air pulsing in the intake runners due to pressure bleeding back through the intake valve due to more overlap with the valve closing later on the the compression stroke.

 

I would most definitely replace your stock chaing whiel your in there. Stocker can get mondo slack in it, letting your timing adv/retard a few degrees. Plus a weak chain wont last with fairly high HP numbers. LS2 chain is a cheap replacment if you want to use it. Its a nice increase in strength over stock. The links are alot bigger and thicker. Its just an alternative to the double roller chains which arent very cheap. I didnt get a shimmed LS6 pump but I did port the inlet on mine.

 

Will the Ls2 chain fit on the stock gears also? Where do you get it from?

 

What he said.