Chevy performance cnc ported ls3 heads

[2013 ss1le]

Anyone running the chevy performance cnc ported ls3 heads? How much did you gain using them? I am taking my car to get a btr stage 3 cam, tsp longtube headers and dyno tune done was thinking I may as well put these on while it's tore down.

[QUICRNU]

I agree, hard not too, especially if you have some miles on the stock ones.

I run them, the local tuner has seen from 20rwhp N/A to 40rwhp FI.

My dyno numbers were not off the charts and maybe a little low, but I couldn't pinpoint a reason and I am still glad I did the heads.

I don't have personal back to back, but the tuner gave a couple of examples with nothing but head changes when he referenced the 20-40, and I wasn't buying the heads from him either.

[2013 ss1le]

I was looking at some other brands that are priced twice as much that the flow charts are not showing that big a difference . I had thought about sending my stock heads to Texas speed for a porting job $750 plus shipping I am sure that would be pricey in itselfbecause of the weight. The better option to me appears to be buying the gmpp heads and either keep the originals for spares or sale them to recoup some of the cost for the new heads they only have 19k miles on them.

[christianchevell]

IMO if your going stage three why not four?....Heads will not make much, the deal is for L99 owners for upgrading the valve, sure there is a tiny bit of work in the combustion chamber and the runners flow 10% more because of the heavy machining.... What you should spend your money on; c5r timing chain, three bolt gear for chain, ls2/7 style dog bone dampener and the most important a high volume pump .....and BTW I believe in break in oil and oil change after break in...using driven racing br30....

I say this as I have all those, I also have had more than one engine, and with our heads flowing so much unless your totally nutted out with like a .650 up cam mega compression or FI your not going to use that improved flow and its not really needed compared to cleaning up your low miles heads, and BTW many many regular old machine shops would port your heads...drunken bums with a die grinder can port heads and have since like 1930.......

As for having the heads ready to just slap on that's nice instead of having to clean up yours but making the engine more bullet proof like say with TRUNNION UPGRADED to BUSHINGS...much more worth the investment and security of down the road being able to use the rockers over and over with 25k spring changes.

Unless your radical and the more radical the more the flow will help is the deal with heads, UDP...more like snake oil and stupidity with guys buying them and not caring about balancing the cams vibrations but chasing 5 hp and gaining zilch.... so JUST FYI.... you wont gain the claims for either....and the heads are much more spendy so you spend 1400$ then sell your old for $500... and gain maybe 5 HP as you already out flow ported BBC heads....... you might gain comparable or even more with a FAST intake and 102 and spend more but they are better also for a more radical build or larger displacement as proven by dyno charts...

Of course this is backed up by facts and my being on here since I got my 2011 l99 vert in 2010 reading lots, and well my driving a stroker with CNC ported heads and higher compression..... flow when not heeded is just extra capacity for the future, me I dream now of things like small bore ls7 heads and a airforce intake and 102 and ls7 headers to complement my build with a more radical cam.... But hey daughter in college ate my wallet so for four years now to go I am broke then ..... well its get what the F I want....

But if your going to get the CNC ported heads anyway the best deal would be through Dickey Scoggins if you have read like every thread and online article as I did they take and freshen the factory job some for not too much more and good results...of course they also are better when needing the flow on a more radical build........

[07-SRT]

Don't get caught up in peak hp/tq from heads ( I was guilty of that) 15 to 25 gains ported heads on average. When I took a closer look at my dyno graph, same dyno and same SAE correction I gained hp and tq basically through the whole curve which matters more than just focusing on peak IMO. Ported and milled my stock heads.

[InFiD3ViL]

Originally Posted by 07-SRT

Don't get caught up in peak hp/tq from heads ( I was guilty of that) 15 to 25 gains ported heads on average. When I took a closer look at my dyno graph, same dyno and same SAE correction I gained hp and tq basically through the whole curve which matters more than just focusing on peak IMO. Ported and milled my stock heads.

Are you LS3 or L99? I ask because you have some very impressive numbers, especially your torque.

[07-SRT]

Originally Posted by InFiD3ViL

Are you LS3 or L99? I ask because you have some very impressive numbers, especially your torque.

LS3.... and the tq wouldn't be that high without milling the heads. According to my head porter compression should be 11.1

[Clarkstar]

Originally Posted by 07-SRT

LS3.... and the tq wouldn't be that high without milling the heads. According to my head porter compression should be 11.1

Where did you get them ported?

[07-SRT]

Originally Posted by Clarkstar

Where did you get them ported?

Landspeed Development, the owner Brett work with GM/Katech development on LS3 and other gm heads.I also have lighter larger exhaust valves 1.60

[zz430camaro]

Originally Posted by 07-SRT

Landspeed Development, the owner Brett work with GM/Katech development on LS3 and other gm heads.I also have lighter larger exhaust valves 1.60

I was going to have him do my head too, what cam are you running?

[07-SRT]

Originally Posted by zz430camaro

I was going to have him do my head too, what cam are you running?

Sent pm...here is dyno graph

[zz430camaro]

That torque curve is amazing!

[WHAMMO]

Sounds like a happy dyno for sure.

Well dont get too much big of a cam if you wanna port and mill the heads. I'd rather take a bit smaller cam and mill the heads to bump the comp. Thats why it is nice to go with aftermarket casting; you can run big cam and higher comp without flycutting.

[07-SRT]

Originally Posted by WHAMMO

Sounds like a happy dyno for sure.

Well dont get too much big of a cam if you wanna port and mill the heads. I'd rather take a bit smaller cam and mill the heads to bump the comp. Thats why it is nice to go with aftermarket casting; you can run big cam and higher comp without flycutting.

Lol. Happy Dyno I've been using the same Dyno since 2011 when I became a member go ahead and look.... I've had srt's I've had (2) 5.0 and (2) Ls3 Camaros...370 horsepower stock Ls3 on the same dyno and you call that a happy Dyno as the numbers I made head and cam o same syno.Have videos too. It's called the right combination most people just randomly put stuff together here I'm sure you've read Bo White's threads how much power does he make and what's he run in the quarter ? Point being his car gets it in the 1/4 mile do to the combo...