Heads that work well with stock displacement?

[blk5genss]

Just wondering if anyone out there could point me in the right direction? I originally was not going to purchase heads for my build but after falling 20HP short of my goal, I am reconsidering this option? My only question is which head to choose, or should I just have mine ported and milled? If milled will this cause any clearance issues or issues with the Fast Intake bolting up? The goal is now between 525 to 550 RWHP and 475 to 500 RWTQ! I am currenlty making 481/453! The current list of mods are as followed:

TSP Cam 231/236/TSP Underdrive/Fast LSXr 102 w/Ported Stock TB/ AirAid CAI/ 1 3/4 Pacesetter LT No Cats/ 3 IN MBRP O/R Exhaust/160* T-Stat/Spohn LCA's/ Lethal Performance Custom Dyno Tune=481 RWHP 453 RWTQ!!

TSP Cam 231/236/TSP Underdrive Pulley/Fast LSXr 102 w/Ported Stock TB/ AirAid CAI/ 1 3/4 Pacesetter LT No Cats/ 3 IN MBRP O/R Exhaust/160* T-Stat/Spohn LCA's/ Lethal Performance Custom Dyno Tune=481 RWHP 453 RWTQ!!

Future mods will consist of 4.11 gears, axles, NT05R's, Barton shifter, 102mm TB, (heads) and a twin disc clutch!

Any help or advice would be greatly appreciated!!

[Synner]

20-30hp is within the abilities of ported heads. If you really want to spend 3k instead of 1k you can get mast heads.

[blk5genss]

I guess what I'm asking is which heads work best with the stock displacement? I don't want a head that flows way too much and actually slow me down instead of helping me. If I do decide to port my stock heads, who can do them and how much would it run me?

[Juiced1]

We carry ported L92/LS3 heads. Excellent flow numbers, they work great with stock displacement. I would recomend adding a cam though.

[Synner]

There's a million vendors on here that offer porting services. $900-1500 for ported heads depending on options like springs/valves is typical.

[Camarowguy]

Originally Posted by Juiced1

We carry ported L92/LS3 heads. Excellent flow numbers, they work great with stock displacement. I would recomend adding a cam though.

Looks like he has a cam.

[Irnwkrkev]

That's a lofty horsepower goal for stock displacement. I would think you would need more compression, a bigger cam, and some bigger primary headers. Alot of $,$$$ for a little power, + you're going to lose some streetability. For that kind of power build a stroker 416" with a bigger cam and it'll still be streetable.... And handle a big shot Ls3 heads aren't exactly the weak point of the engine. jmho

[blk5genss]

Not really, if I am already making 481, I think milling the heads and porting them and the fast intake, will be good for at least 40 rwhp, that puts me at 520, then you add another 10 for the 102 TB, and about 10 more for the electric waterpump and I'm at 540! So what I'm trying to decide is who will port my stock heads, or is there an aftermarket head that will bump my compression to around 11 to 1? Also who can match port the LSXr intake to match my heads for a more precise flow rate?!

[JETG]

Originally Posted by blk5genss

Not really, if I am already making 481, I think milling the heads and porting them and the fast intake, will be good for at least 40 rwhp, that puts me at 520, then you add another 10 for the 102 TB, and about 10 more for the electric waterpump and I'm at 540! So what I'm trying to decide is who will port my stock heads, or is there an aftermarket head that will bump my compression to around 11 to 1? Also who can match port the LSXr intake to match my heads for a more precise flow rate?!

I have been thinking close to the same and have similar set up as you do. I would think realistic with what you are wanting to add, I could see the set up making 515-525 rwhp at most. In the end you will pay around 1600 for the heads with new valves, and you already have springs. The water pump is around 750-800, the LSX intake and NW 102 are around 1300-1400. Then from what I have gathered to bump compression you will mill the heads and then flycut the pistons, which is $$ not sure how much. But your going to spend close to 6-8K on all this, as minimum. Which is right at territory of a blower and you will get more out of it and you can easly later on sell it. Just a thought, believe me I have been going back and forth with the whole decision which is why I have yet to jump on which route I will take. Good luck in your decision, but you might want to check out a guy on here OrangeSS or something like that, his is a LG car with the G6X3 and is the set up your describing.

J

[Irnwkrkev]

40hp is a lot to expect from porting and milling without an upgrade to a larger cam. Best of luck.

[papabearcamaro]

Exact reason I went the Maggie route.
Like you,I was seriously considering staying N/A but after comparing cost to horsepower gains S/C was the way to go. Just my opinion.
Also,I agree that you may be aiming alittle high on your HP gains after the proposed mods.

[blk5genss]

By simply milling the heads the compression jump is worth at least 10, the ported heads from TSP another 20, and porting the Fast intake should be at least 10 minimum. The TSP heads are 899. the port work for the intake is 125 thru a local shop that did the cam and tune I currently have. The biggest cost would be the waterpump and the NW TB! I like the blower, but it is so much fun to whip up on cars and then just say nope it's all motor, plus if I did have a blower I would def break something!! I did in the past with the bottle!!

[JETG]

Originally Posted by blk5genss

By simply milling the heads the compression jump is worth at least 10, the ported heads from TSP another 20, and porting the Fast intake should be at least 10 minimum. The TSP heads are 899. the port work for the intake is 125 thru a local shop that did the cam and tune I currently have. The biggest cost would be the waterpump and the NW TB! I like the blower, but it is so much fun to whip up on cars and then just say nope it's all motor, plus if I did have a blower I would def break something!! I did in the past with the bottle!!

Hate to break it to ya, but unless you plan on running them at the track, a blower car will blow you away. That would also be with a set up good tires at the track. Most cars dont just have blowers on them, they have other bolt ons that will put them well over 520rwhp, and will be more like 600+ and in any roll race, which is what you will more than likely ecounter your going to lose that battle. Either way good luck with your goals

J

[14pilot]

Sorry, don't see how thoses mods will give your stated desired results. It doesn't work this way. You can't just add up the advertised HP gains of various mods and come up with a total HP gain. Even if all the advertised HP gains of each mod are correct (they often are not real world gains anyway), mods don't add up this way when they are combined.