vettenuts

iTrader: (4)

Based on the original question, about wanting something easy on the springs and valve train as a pricipal criterion, why not just keep the Crane?

On the measurement, something I have been confused about. David Vizard discusses that the standard for duration is 0.004 at the lifter, but with the standard small block 1.5 rocker, some cam manufacturers use 0.006 at the valve as their standard. Is this the difference from Crane to Comp, which would mean they are basically the same? I know Crane uses 0.004 at the lifter.

227Hawk

iTrader: (1)

I'm running A Futral cam and i've had 0 problems. I'm Smog legal for Cali 224-228 on a 114 LSA (translated -i felt safe @ the stop lights)
I could have gone longer duration but i'm trying to pass for stock.
Hawk

DavidNJ

Where is Patrick when you need him. LSK anyone?

P.S.
It seems that these cams have about 1deg per .001 lift, so using that would ballpark different measurements.

gettinthere

iTrader: (3)

I've got a custom grind being done on CamMotion lobes right now.

HALLZ

iTrader: (1)

Were is the correct answer?

The one that fits your combination and goals!!!

cantdrv65

iTrader: (3)

The 224 and 228 XER lobes are absolutely great for the street....

Black04A4

I chose my current cam because I wanted to maintain driveability and take it easy on the valvetrain. It's the comp XR273, specs and power are in the sig.

Patrick G

iTrader: (14)

With a 5.3L truck, you want a fairly early intake valve close to allow peak hp under 6000 rpm and massive torque down in the mid-range. You'll also want a fairly narrow LSA to keep an early IVC without having to advancing your cam too much. I'm a big fan of the faster ramped Comp lobes (XE-R or LSK lobes anyone?). With a good dual spring shimmed to within .050" of coil bind (to eliminate spring surge and promote longer life), there's no reason you can't get 30-40K miles out of a set.

With ported heads like the Patriots, I'd probably go something like this:
215/227 .629/.639 110LSA +2 advance.
This gives an intake valve closing point of 35.5 degrees ABDC. This will make for strong power under the curve in a 5.3L and will make peak power under 6000 rpm. Just the ticket for long life in a heavy vehicle running an automatic.

99blancoSS

iTrader: (115)

honestly I think Thunder Racing lobes are the best. 440hp and 420tq with a little ol 224/224 cam says it all I think.

ThirdGenLS1

iTrader: (11)

i talked to tons of shops, and i had i the best experience with Thunder, they actuly took the time to listen to what i want and grind somthing specificaly to what i want.

staringback05

iTrader: (8)

when u find a good streetable cam let me know lol

Hemi Killer

iTrader: (6)

Thanks for the info, but the cam I pick will be going in a stroker (382 LS1). I'll probably go with the cam TR recommended(224/228-.58x/.59x-110lsa), it's an XER lobe. How do you think that would do in a 382 LS1? Thanks.

magius231

iTrader: (8)

advertised duration numbers are just that: advertised. They can pretty much measure them however they want to and make the cam look however they want. Try not to put too much stock in them, and don't use them in calculations and expect it to be the "final answer". There's a reason the standard is @.050...

Bader-X

iTrader: (2)

WoW!
spring life is in the 20000 to 40000 miles with some cams and double springs!

I thought just choose springs that matches the cam and you can drive +100000 miles just like a stock cam and springs?

My plans are some ported heads (probably Patriot stage II ls6) with their springs and a cheatr cam or something close to it (stock idle sound and 1200 - 1500 rpm cruising without shaking or rattling) so can`t I use a cam with patriot springs or the comp behive ones and drive without worrying for say 60 k miles?

Patrick G

iTrader: (14)

Well that changes a lot. If you want a streetable cam for a 382, then you want to go about 6 degrees bigger than what you'd run in a comparable 346. That version of my torque cam would be:
231/235 .643/.646 110LSA +1
If you wanted, you could always substitute an XE-R lobe for the exhaust.

Hemi Killer

iTrader: (6)

What's the benefit of substituting an XE-R lobe for the exhaust? Would the 231/235 cam be like instant torque off idle? WHat do you think that would peak at and be capable of producing hp/tq wise with headers and stage 2 pp 5.3 heads? Thanks for the help!

Patrick G

iTrader: (14)

Some people like running an XE-R lobe instead of an LSK lobe because the exhaust needs to be really quick off the seat to build best torque and they will sacrifice some lift to get a little quicker valve action at .006". I still like the greater area under the curve with the LSK lobes.

The 231/235 110LSA LSK cam is more of an all-around power-grind. Even with your power-robbing truck driveline, it should make 400+ rwhp through an unlocked converter. If you're looking for more instant power off idle, then you can make the intake duration a little smaller:
224/235 .633/.639 110LSA +2 ground with Comp LSK lobes.
This would rock in a 382 truck with instant torque off idle.

Probably 400 rwhp at 5700 rpm, 440 rwtq at 4400. These are automatic numbers remember.

Hemi Killer

iTrader: (6)

That's what numbers I would like to see on the dyno, my goal was ~400rwhp/425rwtq. The 231/235 cam should produce more than enough low-end with say a 2600 converter, right?

Patrick G

iTrader: (14)

The 231/235 LSK lobed cam is a little big for a 2600 stall. Either consider more stall or go with the smaller cam.

The Alchemist

iTrader: (19)

I just pulled up my cam card from my TR224 cam from 3.5 years ago.

According to the calculation above, I have 51 degrees between the 0.006 lift and my 0.050 lift, so I guess it's on the agressive side of the equation. Back in 2003 the car dyno'd 430/400 with mac headers and a shitty 2.5" ypipe that had numerous crushes in it.

Now with QTP longtubes and ypipe, I wonder where I'm at power wise and if a cam change would net me much. I still have a stock pulley and ls6 intake, so I bet that would net me a few extra ponies.

I learn something new every day on this site.

Thanks guys.