Cam choice for a stock LQ9
TECH Senior Member
Joined: Jun 2016
Posts: 22,303
Likes: 3,619
From: Central Cal.
Regarding smog testing and the GM Hotcam -
Hot Cam specs 219/228@.50 .525/.525 lift 112 LSA
A friend put this cam in this 99 SS Camaro and back in 2001 it failed the sniffer test and his car failed emissions repeatedly. He finally ended up selling the car due to the failed smog test issues. The hydrocarbon count was too high even with cats and tuning. With today's much better tuning it might help but I would want to find someone thatschad a hot cam pass the same emissions testing routine your car will face. The 112 LSA is hurts the sniffer test.
A 224/224 114 LSA will normally pass a sniffer test with a good tune in a LS1.
Hot Cam specs 219/228@.50 .525/.525 lift 112 LSA
A friend put this cam in this 99 SS Camaro and back in 2001 it failed the sniffer test and his car failed emissions repeatedly. He finally ended up selling the car due to the failed smog test issues. The hydrocarbon count was too high even with cats and tuning. With today's much better tuning it might help but I would want to find someone thatschad a hot cam pass the same emissions testing routine your car will face. The 112 LSA is hurts the sniffer test.
A 224/224 114 LSA will normally pass a sniffer test with a good tune in a LS1.
Our high lift hot cam on a 114 passed basically a hearing test and emissions in Germany. We have had a few people from Cali grt them but it is VERY difficult to get feedback.
If you want to drop hydrocarbon emissions you can change the timing and afr in the areas that a clayton etc dyno would run. most of the time its idle and then some smooth accel and decel and not aggressive so WOT/PE isnt even an issue.
I helped on the GM Challenge X project with their hydrogen fuel cell equinox and we did so many drive cycles on the mustang dyno with the sniffer hooked up it was ridiculous.
If you have NOx issues then just turn the timing down to decrease cyl temps/heat and put a cooler stat in.
If you want to drop hydrocarbon emissions you can change the timing and afr in the areas that a clayton etc dyno would run. most of the time its idle and then some smooth accel and decel and not aggressive so WOT/PE isnt even an issue.
I helped on the GM Challenge X project with their hydrogen fuel cell equinox and we did so many drive cycles on the mustang dyno with the sniffer hooked up it was ridiculous.
If you have NOx issues then just turn the timing down to decrease cyl temps/heat and put a cooler stat in.
The Texas Speed STG2 low lift truck cam is what id recommend. Runs $389 for cam AND springs. Uses stock pushrods. Great pickup in tq. Anything above that would really not be what you want.
http://www.texas-speed.com/p-1158-ts...e-springs.aspx
http://www.texas-speed.com/p-1158-ts...e-springs.aspx
What kind of use will the truck see? Daily, pulling trailer, street toy with an occasional trip to the drag strip?
What is he willing to spend on springs, and will he be willing to change springs down the road? How many miles does the truck see a year?
I am tempted to drop some 243s I have sitting around on my '01 2500HD. It is a daily which does pull a car trailer from time to time.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo TECH Senior Member
Joined: Jun 2016
Posts: 22,303
Likes: 3,619
From: Central Cal.
Those heads and a good truck cam will make your truck come ALIVE! Either WS6store or Cam Motion can help you with whatever you want to do.
Have you ever seen or actually heard of someone testing their springs on the reg even with super aggressive cams unless something happened?
No need to worry here.