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Old 01-19-2016, 10:58 PM   #1
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Adding Trick Flow Heads to Supercharged L99

In my ongoing quest to find more California legal mods, I learned that these Trick Flow ported heads are smog-approved: http://www.trickflow.com/parts/tfs-32610001-c01

Hard heard some mixed reviews about Trick Flow, anyone have any experience with these?

Any problems with the heads themselves aside, from what I understand there aren't yet any CA-legal cams available for gen5. If that's the case I'm guessing the gain from adding heads alone won't be worth the cost of the parts and labor (as opposed to a head and cam swap). Anyone agree / disagree? Also happy to be wrong on the no CARB-legal cams; if anyone knows of one please let me know!

PS - yes, I know you probably wouldn't get caught at the smog station with an aftermarket cam, but wanted to know whether there are any truly legal ones out there.

Thanks!
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Old 01-20-2016, 07:46 AM   #2
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Why not just factory ported heads? I would run those over TF. If you run a small enough cam they can't see it or even know it is in there.
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Old 01-20-2016, 01:54 PM   #3
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GMPP cnc ported ls3 heads are hands down the best heads for the money. $1250 brand new. Sell you old ones for 500 and you into kick butt set of heads cheap.
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Old 01-20-2016, 06:44 PM   #4
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Why add heads? Can't you exceed the stock block with just a supercharger? But I ran into this a few years back with a mustang that I had. The cost of doing ported heads with forced induction wasn't worth it so instead I pulled down and added 2 psi. That's my thoughts on it.
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Old 01-20-2016, 06:51 PM   #5
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Thanks for the tips. Unfortunately the GMPP ones (or any other ported heads, including porting your own) aren't legal in CA, which is why I was asking about the Trick Flow ones specifically.

Was thinking of dropping to a smaller pulley (pretty sure that's not legal either though). Anyways, thanks for the ideas!
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Old 01-20-2016, 07:01 PM   #6
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man you need to move california aint no fun and everything causes cancer there!!
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Old 01-20-2016, 07:02 PM   #7
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Not sure if pulley is legal out that way but couldn't you just swap it back to stock pulley for inspection? Wish I could help you with the trick flow heads but I have no info
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Old 01-20-2016, 07:08 PM   #8
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Quote:
Originally Posted by supergt99 View Post
Not sure if pulley is legal out that way but couldn't you just swap it back to stock pulley for inspection? Wish I could help you with the trick flow heads but I have no info
Getting a new pulley in black I'm guessing no one would even notice. There's a whole pile of "technically not legal but hard to spot" mods, but I was trying to figure out what's left to do that's actually CARB compliant. Thanks for the tip. Ya, modding out here (legally) is definitely harder than elsewhere...
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Old 01-20-2016, 07:10 PM   #9
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How would they know if you had stock head ported? Ls9 cam legal?
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Old 01-20-2016, 07:25 PM   #10
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Quote:
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How would they know if you had stock head ported? Ls9 cam legal?
They probably wouldn't. No, swapping cams (even from L99 to an LS3 cam) is technically illegal.
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Old 01-20-2016, 07:28 PM   #11
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You gotta move
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Old 01-20-2016, 07:41 PM   #12
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You gotta move
I dunno, kind of nice to have some of the highest state taxes in the country to fund an organization that tells me what kind of shorty headers I can buy.
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Old 01-20-2016, 07:42 PM   #13
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no doubt move with the quickness
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Old 01-20-2016, 10:55 PM   #14
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I'm running those heads but on a NA 427. They are quality pieces and I am betting you will see more power with less boost as they are significantly better flowing than stock LS3 heads. The fact you are blown will net you better gains than a NA guy would.

That being said if you are just looking for more power do a pulley change and tune. Cheaper and easier and smog station won't know the difference anyhow. Even if they did it easy enough to revert to stock once every two years.


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