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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 09-10-2011, 04:10 PM   #1
Pollock
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Do Ported heads really help any?

From looking at peoples sigs who have cams... Lets say for example the texas speed 231/236 cam seems to make 480 rwhp with or without ported heads.

So do the ported heads really help? Or are you netting 5 to 10 rwhp for 900 bucks?
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Old 09-10-2011, 04:23 PM   #2
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They will get you 5-10 alone but they improve the eficeincy of the cam and combined is the added power, with a cam they will get you 15-20
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Old 09-10-2011, 05:24 PM   #3
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Try looking up Darin Morgan on here he is cheaper and I believe does a better job porting the stock heads than the others on the market. Once you get to this level of mods power enhancements won't come cheap and the gains will be smaller bc the big gains have been made with the other bolt ons!! Gotta pay to play!!!
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Old 09-10-2011, 09:04 PM   #4
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You do have to understand...our 6.2 liter engines...are not a LOT bigger than older small blocks that guys have been playing with for years, but our LS3 heads, bone stock already out flow a LOT of older ported heads...GM castings as well as aftermarket.

There are people who can do an excellent job porting these heads, and you will gain a good amount of power...but you need to find the right people...there are a lot of them who aren't really doing much other than smoothing out the "as cast" walls without changing port/chamber geometry at all.
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Old 09-10-2011, 09:07 PM   #5
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The stock ports are already so big, the gains are really realized on larger motors that benefit from more flow, versus port velocity.
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Old 09-10-2011, 09:57 PM   #6
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My TEA LS3 heads and the others I've seen do not increase the CSA to affect velocity. The porting on LS3 heads is typically minimal than say ported 243 heads. Majority of the porting is just narrowing/smoothing the valve guide boss and blending the bowl to a 5 angle valve job.

You will pick up little power if its a stock motor.
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Old 09-11-2011, 05:58 AM   #7
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They do increase CSA, by the nature of porting itself, they have to, even if its only minimal. On a stock cubed motor, good CNC heads are still worth around 20-25hp.
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Old 09-11-2011, 07:15 AM   #8
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There are people who can do an excellent job porting these heads, and you will gain a good amount of power...but you need to find the right people...there are a lot of them who aren't really doing much other than smoothing out the "as cast" walls without changing port/chamber geometry at all.
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Old 09-11-2011, 11:15 AM   #9
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So Ed can you pm me a recommendation on what to do? With 480/453 (m6) to the wheels @ 3920 with me in it and a 1/4 tank of gas stock gears and drag radials will I ever see 11's with this car? Or do I need gears and ported heads?
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Old 09-11-2011, 11:57 AM   #10
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Are you a A6 or a manual trans? If an A6 just the correct torque converter will pick up .5-.7 sec in the 1/4 mile depending on traction.
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Old 09-11-2011, 02:07 PM   #11
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Are you a A6 or a manual trans? If an A6 just the correct torque converter will pick up .5-.7 sec in the 1/4 mile depending on traction.

LS3 manual
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Old 09-11-2011, 02:46 PM   #12
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you should be in the 11's with a good launch and drag radials
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Old 09-11-2011, 03:29 PM   #13
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you should be in the 11's with a good launch and drag radials

Who me or someone else?
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Old 09-11-2011, 03:46 PM   #14
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They do increase CSA, by the nature of porting itself, they have to, even if its only minimal. On a stock cubed motor, good CNC heads are still worth around 20-25hp.

Why do they "have to"? Some porters will add just as much or more material than they remove (Ford Cleavland heads for example).

Check out all the OE cnc'ed LS3 test put up by Hot Rod on a 700+hp motor. All heads (except the MAST heads) were with 1% power of each other (well within the range of the dyno's variances from pull to pull). So from that standpoint, take your pick for OE ported heads.
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Old 09-11-2011, 04:54 PM   #15
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what bought a ported intake? Seams like would get the same power with a cam. Cheaper.
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Old 09-12-2011, 12:03 AM   #16
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Quote:
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Why do they "have to"? Some porters will add just as much or more material than they remove (Ford Cleavland heads for example).

Check out all the OE cnc'ed LS3 test put up by Hot Rod on a 700+hp motor. All heads (except the MAST heads) were with 1% power of each other (well within the range of the dyno's variances from pull to pull). So from that standpoint, take your pick for OE ported heads.
CNC ported heads and hand welded/ported heads are not comparable. No one welds LS3 heads, its pointless. The cost would be prohibitive compared to an aftermarket head that flows better to begin with. I stand by my statement, as it remains correct. This isn't an iron ford cleveland head
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Old 09-12-2011, 10:03 AM   #17
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Side by side the PRC CNC Ported LS3 heads add roughly 25rwhp. If you look at people that dyno before & after the heads that's very typical of the gains.

You can't really just read a few dyno sheets & determine what works, there are just to many other factors. I would look for before & after dyno sheets.

If your wanting more we are working on PRC aftermarket casting LS3 heads currently. They ship with smaller runners, smaller chambers, and larger head flow! Expect near 40rwhp to be possible with these heads!!
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Old 09-12-2011, 11:26 AM   #18
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Side by side the PRC CNC Ported LS3 heads add roughly 25rwhp. If you look at people that dyno before & after the heads that's very typical of the gains.

You can't really just read a few dyno sheets & determine what works, there are just to many other factors. I would look for before & after dyno sheets.

If your wanting more we are working on PRC aftermarket casting LS3 heads currently. They ship with smaller runners, smaller chambers, and larger head flow! Expect near 40rwhp to be possible with these heads!!
Now 40HP that is what I am talking about. I am sure that is going to be worth the price.

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Old 09-12-2011, 11:30 AM   #19
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So Ed can you pm me a recommendation on what to do? With 480/453 (m6) to the wheels @ 3920 with me in it and a 1/4 tank of gas stock gears and drag radials will I ever see 11's with this car? Or do I need gears and ported heads?
If you can get that car to hook up, and shift it like you mean it, there should be no way it won't run in the 11's.
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Old 09-12-2011, 12:32 PM   #20
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Originally Posted by Jason 98 TA View Post
Side by side the PRC CNC Ported LS3 heads add roughly 25rwhp. If you look at people that dyno before & after the heads that's very typical of the gains.

You can't really just read a few dyno sheets & determine what works, there are just to many other factors. I would look for before & after dyno sheets.

If your wanting more we are working on PRC aftermarket casting LS3 heads currently. They ship with smaller runners, smaller chambers, and larger head flow! Expect near 40rwhp to be possible with these heads!!
Any estimate as to when these will be available?

What about camshafts...still working on a new ls3 cam?
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Old 09-13-2011, 12:20 PM   #21
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Heads are machining & shipping. We will be shipping a few sets this week & a few sets next week.
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Old 09-13-2011, 02:09 PM   #22
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Heads are machining & shipping. We will be shipping a few sets this week & a few sets next week.
hopefully mine are one of the sets that are shipping next week
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Old 09-13-2011, 02:13 PM   #23
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Heads are machining & shipping. We will be shipping a few sets this week & a few sets next week.
Are you still working on another camshaft? One that is slightly larger because your new castings will allow for a bit more P to V clearance? I thought I read this before.
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Old 09-13-2011, 02:22 PM   #24
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From looking at peoples sigs who have cams... Lets say for example the texas speed 231/236 cam seems to make 480 rwhp with or without ported heads.

So do the ported heads really help? Or are you netting 5 to 10 rwhp for 900 bucks?
It all depends on the who ports them ... LS3 heads are pretty good to begin with but there is always more power to be made.. more than 5 to 10 hp
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Old 09-13-2011, 04:41 PM   #25
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Originally Posted by Jason 98 TA View Post
Side by side the PRC CNC Ported LS3 heads add roughly 25rwhp. If you look at people that dyno before & after the heads that's very typical of the gains.

You can't really just read a few dyno sheets & determine what works, there are just to many other factors. I would look for before & after dyno sheets.

If your wanting more we are working on PRC aftermarket casting LS3 heads currently. They ship with smaller runners, smaller chambers, and larger head flow! Expect near 40rwhp to be possible with these heads!!
Will these work with VVT and how will they compare to yalls PRC LS7 heads? Also do we have any dyno sheets with these heads yet?
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