Good day everyone. A forum member is selling a comp cam and he mentioned to me that it would pass the sniffer smog test in CA. He also said that I would gain about 50 - 60 rwhp by adding it to a setup with stock LS1, 6 liter heads, exhaust, and a ProCharger. He mentioned it was very streetable. I know very little about cams so I ask you guys for input. The cam is:

Comp Cams XR269HR cam. The specs on it are 216/220 .525/.532 114 LSA.

All input welcome.

Thanks.

 

That cam will easily pass smog as I had a even bigger cam that passed CA smog. That cam should make at least 4o hp more than stock.

 

Still thinking 40 rwhp is still high for that cam you should be ok on the smog and the driven it on the street....

 

What other cams would you suggest to compliment my setup that would give me optimum power and keep me smog safe?

Thanks.

 

I got a Comp Cam 224/228 581 588 114+1 Lobe Center and I am able to pass smog -

with the cam you have mentioned that has less duration and lift it would be even easier to pass the emissions test!

If you want a cam that is smooth and really really emisiions friendly call A&A Corvette's and speak with Andy about one of his cams. They are super stealthy and make great power.

You coud also call Charlie at RPM Motors in santa Clarita and speak with him on Cam selection too. (Both ar forum vendors and sponsers).

Make sure you give the details of your set-up to them!

Question: About your current set-up-
What heads are you running?
Block?
Year of Vette?
P1SC-1 or -2 system?
Headers?Hiflow cats?Xpipe?
Muffler etc?

Need a few details

Thanks,Matt

 

Tiny cam for a supercharger set up

 

 

that's a pretty small cam by most standards.... bigger cams than that will pass emmissions no problem, it's all up to the tuners capabilities though......

 

Thanks for the info. I am still piecing my setup together. Don't have the heads yet or the P1SC but will be looking at purchasing them soon enough. It's a stock LS1 block. 98 coupe. I am currently running B&B bullets. Probably won't run headers or high flow cats since that will not pass smog.

 

That's cool!

What heads are you thinking of getting?

Did you know JBA makes a set of SMOG Legal 1 3/4" Shorty Headers for our Vette's? (Check JEGS www.jegs.com )

You can install these right up to the stock pipes and install a good X-Pipe where the stock H-pipe is and you'd be set! (I would suggest Magnaflow's True X-Pipe by far the best).

Keep me posted on your progress!

Thanks,Matt

 

I have no clue on the heads but am open to suggestions unless you think that for the gain I should just stay with my stock heads.

I did not about short headers. In this setup would I notice any gains?

 

Yes! I will work waaay better than stock but not quite as good as long Tubes - the nice thing is is that they are SMOG Legal and they are 1 3/4" (Most shorty's are 1 5/8" )

Here are the Shorty Headers from Jegs: there are 3 to choose from, having different coatings on them but all are satinless steel -

(1) JBA 1817S-5 - JBA General Motors Shorty Headers $773
http://www.jegs.com/i/JBA/578/1817S-5/10002/-1

(2) JBA 1817S-5JT - JBA General Motors Shorty Headers $948
Stainless steel with titanium ceramic coating
http://www.jegs.com/i/JBA/578/1817S-5JT/10002/-1

(3) JBA 1817S-5JS - JBA General Motors Shorty Headers $948
Stainless steel with silver ceramic coating
http://www.jegs.com/i/JBA/578/1817S-5JS/10002/-1

Magnaflows TRU Xpipe: Magnaflow 15437

Jegs: They will match anyones price so do a Google search on the part number above and find the cheapest-these are just a couple i looked up!
http://www.jegs.com/i/Magnaflow/642/...0002/-1?CT=999

http://www.corvettegarage.com/produc...-corvette.html


Now as far as the Heads go, a good used set of LS6 heads or Patriot heads will work awesome

Patriot heads:

https://www.patriot-performance.com/...&cat=37&page=1

If you get a set of used LS6 heads then get a set of "NEW" springs from Patriot as well: this is a must
https://www.patriot-performance.com/...&cat=51&page=1

But you can get 500 RWHP out of a stock LS1 and a Procharger or an A&A Vortech (CA Smog legal) kit.

My buddy who has a custom tune, LT's, Hiflow cats, Xpipe, Tubi exhaust, methanol injection, procharger 12.2 PSI of Boost, MN6, STOCK LS1 2004 Coupe with 60lb Injectors and PATRIOT GOLD Springs too. Making 559 RWHP

I hope this helps some. If you do H/C , Shrt headers, Magnaflow Xpipe, you will not need to run as much Boost to make power and it will breathe much easier!

My buddy wants to do a cam in his now, he will gain more RWHP but he wants to keep it where it is in RWHP so he will be able to dial back some Boost and make the same power with "LESS" stresss on the stock set-up!

I made 591 RWHP with H/C (See sig below) LT's, Hiflow cats, xpipe on my stock bottom end LS1 running only 7.8 psi of BOOST on an Automatic 4 speed too! H/C made it breathe better but I did have 10.8:1 compression too!

I hope this helps some

Thanks,Matt

 

Thank you very much for all that info. It will help a lot. So I have heard that the best heads for boost are 6 liter truck heads since they drop the compression a bit. Is that not the case? I will be looking at staying around the 530-550 rwhp range.

 

6.0 litre truck heads are known as 317 (casting number), or

LQ9 / LQ4 are the 6.0L truck heads with LS6 ports but with larger (72cc) combustion chambers. they yield about 9.6:1 on a 346 with GM 6.0L MLS gaskets.

Now here are the stock LS1:
72.27cc = 9.1 CR
71.71cc = 9.2 CR
71.05cc = 9.3 CR
70.59cc = 9.4 CR
70.03cc = 9.5 CR
69.74cc = 9.6 CR
68.91cc = 9.7 CR
68.35cc = 9.8 CR
67.79cc = 9.9 CR
67.23cc = 10.0 CR
66.67cc = 10.1 CR (stock LS1 head spec)
66.11cc = 10.2 CR
65.55cc = 10.3 CR
64.99cc = 10.4 CR
64.43cc = 10.5 CR (stock LS6 head spec)
63.87cc = 10.6 CR
63.31cc = 10.7 CR
62.75cc = 10.8 CR
62.19cc = 10.9 CR
61.63cc = 11.0 CR
61.07cc = 11.1 CR
60.51cc = 11.2 CR
59.95cc = 11.3 CR
59.39cc = 11.4 CR
58.83cc = 11.5 CR
58.27cc = 11.6 CR

So they (LQ9/LQ4) will LOWER "NOT" raise the compression at all. The LS6 Heads or a set of 5.3 Litre truck heads are awesome -

Or get the Patriot's mentioned above all ready to go and fully assembled

If you raise the compression slightly you will not need to run as much Boost either to make the same RWHP!

Thanks,Matt

 

Interesting, I was always under the impression that a lower compression was better for boost.

 

You are correct - that is the best way to go WHEN you build a dedicated Boost motor - when you start from scratch and you have set goal you want -

Like some here who build 1000+ RWHP Vette's and want to start with a low compression motor and run at least 22+ PSI -

But you are starting with a stock LS1 motor, so you can do the 10.1:1 or 10.5:1 motor and still reach your goal easily -

But if you start now and drop your compression to 9.5:1 or lower now you have to run more Boost to achieve you goal -

Just look at what a stock LS6 compared to a stock LS1 can make - the LS6 has better Heads and Cam and more compression add 10 PSI of Boost and you will make more HP with this over the same 10 PSI on a stock LS1

Thanks,Matt

 

If you give comp cams a call in Memphis TN and talk with one of the guys. He can make you up a cam to pass the CA smog and make you the most HP or TQ that you can and still be legal.. Just need to tell them what parts you have are will work your way up to in the days to come with the car...