Who has a 224 cam or slightly smaller and stock exhaust on a LQ4? I have long tubes but looking to sell them since they were for a truck that is going to go turbo now. I could put them on the Yukon Denali but a cam should get me a much better gain.

If you have a cam do you have headers or stock exhaust?

 

To give you an idea there is a truck on LS1truck.com who has a pretty healthy 5.3 with stage 2 patriot heads and a 222/226 cam in it. He ran on stock manifold and stock exhaust except a muffler for over 2 years. He put down 341rwhp thru a 5speed. He then jumped to some stainless 7/8 headers with high flow cats and jumped to over 400rwhp. So that is a 60+HP jump. Keep in mind this is thru a 5 speed. However, even its only a 30-40hp difference it is a big difference. Now no a stock motor won't see these kinds of jumps, but a stout cammed motor will. Consider all the extra air and fuel that aftermarket cams bring in above 4000rpm. I was like you and thought meh the long tubes can weight. This truck made me a believer. I wouldn't do anything more than 210 exhaust duration without longtubes.

 

I have the cam in my sig now with stock manifolds and cats, just ordered some thorley tri y headers I'll be installing when I get back from okinawa

 

Do you tow at all? if so how does this cam do?

 

Stock heads I think would restrict more then stock manifolds. So I see your point but I would guess with stock heads manifolds vs. headers would be 15-25 hp.

Can you get me a link to the thread I would like to know more details.

 

I haven't had a chance to tow with this cam yet, and my only time towing with the stepside so far was pretty much on flat ground from Redding, CA to the Bay Area flat towing a ~5600 pound Scottsdale behind it...

 

with stock manifolds the cam game changes a TON.

You need less overlap, and you need that overlap to be biased on the intake stroke so that the decreased flow and added exhaust pressure does not disrupt intake air flow when the intake valve opens.

Something like a 210/222 on a 115 with no advance ground into it will close the exhaust valve 4* before top dead center, and open the intake 10* after top dead center. Its enough overlap to function right with manifolds, but an early enough intake valve open and close to make much more bottom and mid range power than say the LS6 cam despite its larger duration. That being said I bet this cam is still good for 6200-6400 RPM in an LQ4. Intake valve stays open as late as the LS2 cam, and the added duration would help over rev as well. with -14* overlap it would idle mostly like stock, but it should be just a hair more aggressive.


Basically what I'm trying to tell you is that most if not basically ALL off the shelf grind cams need headers to function properly. Without headers you leave a ton of power on the table simple because they were designed to work with them. You can minimize that loss by designing a cam to work better with manifolds

 

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I bought this cam. If towing becomes an issue I will look at a smaller one. I have other things to tow with so it isn't the end of the world also. Like I said load usually stays fairly low at 4000-5000#s. We will see what happens.

I will be looking for headers soon too. I understand there importants. Hopefully they won't hold me back too much but I don't want to cam for a stock manifold then re - cam for headers. I think I took the better road. Only time will tell.

 

Kind of a funny cam choice. This thing will have great mid range and pull really well up top, but locked on the highway I think the loss of low end will be there when tipping in with the converter locked. It also has a good amount of overlap to it will sound pretty beastly at idle...

The split in duration is kind of funny too. Its a lot more than you would typically find with 317 heads and headers. I think this cam would work great with L92 heads and headers.

I'd file this one under not a towing cam... it will be fun for sure, but it aint for towing.

I can't wait to see what you think of it. I'm curious how it will sound with the manifolds on there, and also how it will perform with a 3200 converter and 3.73 gears in that Denali. I think the 3200 will be enough because the intake duration isnt all that big, but it would definitely appreciate more.

 

Not a great choice. Your towing a trailer not drag racing, not to mention your truck is a pig to start with.. You don't have to recam for any of it. Headers simply help the cam shine. In this case it will be way up the rpm band. Find some tri Y style headers, small primary ones. That cam is bigger then most guys run for a track set up. BIGGER ISN'T ALWAYS BETTER.