Biggest cam to meet ULEV Emissions on an LS1
 

My swap is considered a 2001 F-Body. I run a 224/224 114LSA .566 lift cam and with my stock manifolds and cats pass emissions with flying colors. My heads supposedly flow 305cfm. I'm wondering how big I could go before running into trouble. Also, on a higher compression NA motor, what's the theory for in/out duration?

I don't want a HUGE cam that lopes hard (which wouldn't pass anyway), but I could certainly tolerate something slightly more aggressive. I guess the best question is what are the gnarliest street legal cams in 01 F-Bodys.

I think that's about as big as you can go. I know a 112 LSA cam won't pass here. Not sure about everything else though.

That is a tough one. it takes about ten degress more duration to get a drop in compression. Closing up the LSA will also bleed off some compression, but pass smog-- that is a tough one.:huh:

Just for info--- My cam has 254 degrees at .050 ---flat tappet solid lifter.

I'm running a 110 LSA cam in the Cobra and it passes with ease.

Your passing as a 94 Cobra though right? I'm passing as a 2001 ULEV (might be SULEV). Do you have your smog cert? What are your numbers, I'll post mine later.

Seriously? I remember on LS1 back when I had a Camaro that basically a 114 was the most you could pass in California :huh:

Here is a thread about it on tech.

Here is a quote:
"A 112 LSA is almost guaranteed not to pass the sniffer in California; haven't seen one person do it even with tuning, a 224/224 114 Cam is biggest cam I've ever seen pass the sinffer here in Cali."

Some guys do claim on the 2nd page to have passed with a 112 though.

Yes the Cobra passed as a 94 Cobra so I'm sure my limits are higher than yours. I don't have my smog cert but if you have yours post it and I'll have Throttle Crazy take a look at it. He'll be able to tell you how close you are with your cam.

Here are the specs on the cam I have in the Cobra.

Product Line: Crane CompuCam Camshafts
Part Number: CRN-444231
Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 2,400-6,000
Duration at 050 inch Lift: 220 int./220 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.498 int./0.498 exh. lift
Lobe Separation (degrees): 110
Computer Controlled Compatible: Yes
Grind Number: 2040
CARB EO Number: D-225-46

Well you can see here I'm well above the average with my setup, but still quite a bit of headroom it seems.

We had some serious LS1 guys working here a few years ago. They told me the same thing- 224/224 114 Cam is biggest cam to pass Calif. smog. Then one got fired and the other quit.:drink: