Originally Posted by
beertestr
He said nothing about changing converters. He said nothing about raising the shift points. Going a heck of a lot bigger with a 5.5k shift point is only going to hurt bottom end torque more than increasing HP in the range he's talking.
You're right he didn't say anything about that. That's why I suggested he run something like a 206/212 or something very mild that allows you to run the stock converter. You're also right in that he didn't say anything about changing shift points. Most people change them anyways when they get a custom tune even if they're bone stock. I know most tuners will turn the 1-2 shift up to around 5900-6100 with the stock cam.
A 206/212 is actually more designed for a 5000 pound truck and I know plenty of people using one in their 5.3s.
Keeping duration in check while increasing lift typically does not hurt torque as much while increasing HP. I'll have to read back through the posts, there was another guy jumping on, but I thought I read a post about porting, hence my comments. Look at the bottom. If you THINK that going above 0.450" lift is not worth it, then why be in favor of a LS6 cam that 0.550/0.547?
I never was in favor of the ls6 cam. It's a great turbo cam and a good cheap cam, but it certainly not the best. You will never find me recommending one to someone with an n/a build. I have owned 3 different ls6 cams though and paid $60, $77, and $100 for each of them. That's what makes them so appealing.
As far as the lift I'm aware of what their lift is. I have an 04 ls6 cam sitting right in front of me actually. See above for why I recommend it(it's cheap). My point was in regards to you saying something about increasing lift. My theory hasn't been proven, but I have seen plenty of flow charts and things don't add up. Running a .600 lift cam on stock 5.3L heads just doesn't seem worth it to me.
Why does everybody keep commenting about the pushrods? I never said anything about changing pushrods. I said that the stock springs won't handle the LS6 lift/ramp profile. I also said that the Yellow springs are marginal above 6000 rpm with the heavier, non Ti LS6 valves.
I thought you had said something in regards to the pushrods. Maybe I read it wrong
No the lobes are not incredibly aggressive, but it makes pretty decent power, with factory springs. It will run a LONG time without any spring, cam lobe wear issues. Yes, it's longer duration, but the LSA is pulled 5 degrees in from the LS6 cam. This should help conserve torque.
If by factory springs you're talking about the ls6 springs then quite a few cams will work with those springs. There are plenty of guys running the Tr220 with ls6 springs. That cam has proven to take people well into the 12s.
My opinion is based on talking with the guys that designed the LS6 cam and valvetrain. I have gone the gamut of looking at factory cam options, from LS6 to the Hot, to LS7 and LS3, so I asked a lot of the same questions the original poster asked, and relayed the answers I was given.
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