Matt87GTA

I am wondering if there would be any Piston-to-Valve clearance issues. I know that the best way to ensure things is to measure with clay... I did so on my 383 in my GTA when I built that engine. But I am budgeting and planning a heads/cam upgrade and just for the sake of knowing what I have ahead of me, I am wondering if anybody is out there running this combo and if they have had to fly-cut the pistons with these components...

I am also curious what kind of power that combo would make on a stock lower end with an LS6 intake, ported TB, and Pacesetter LTs with Borla through a T56 and 10 bolt. These would be the 2013 heads and 8421 cam...

Thanks in advance.

ArklaTexan

iTrader: (24)

I have just installed the LS6 Stage II 59cc with my Cam 244/242 .612/610 112lsa and it cleared by minimum gm specs. We clayed and it came out ok. Do you have the newer milled heads or the welded chambers? That cam size regardless looks like it will work.

Matt87GTA

I don't have the heads yet, I am thinking about buying them and that cam...

Wow, you have a huge cam and small chambers and still enough PTV clearance?? No notching of the pistons?

ArklaTexan

iTrader: (24)

Yeah the cam is rather large and fits under stock heads with enough clearance. I have the previous casting of patriots ls6 heads. They use a welded chamber on those and mill the heads on the new ones. They are stock deck height so no problem there. I have had the car taken apart since the head install to look for any signs of problems and none so far

2000KnightRider

iTrader: (21)

What did you dyno with that huge cam?

ArklaTexan

iTrader: (24)

When I was just Cam, headers and Exhaust it was 418rwhp 412tq. I have since added heads, fast 90, NW 90 Tb, UD Pulley and 150 shot.

MIDTOWNSS

iTrader: (2)

Have you had it dynoed since the new add ons?

ArklaTexan

iTrader: (24)

Yeah we did but it was when my nitrous kit was DRY. We had to "detune" the car NA to an AF ratio of 10.2. That way when the 150 shot hit it would be at optimum AF ratio. So that being said I lost 30whp or so. From 418 before to 445 detuned should be just over 475 at the next pull as we are switching to a WET kit. Will be putting down between 600-625 rwhp with nitrous.

99ssleeper

iTrader: (98)

Matt, the Patriot LS6 heads are not ported from real LS6 heads, from what I know they just port them to resemble the LS6 ports. If you would like to do a heads/cam swap just once, consider TEA's Stage 1.5 5.3L heads ....402rwhp through an auto with bolt ons and an LS6 intake, with the baby 224 cam.

phoenix1987

iTrader: (3)

Yep, Ls6 "Style" heads. Aren't they a worked 6.0 head Mike? Matt if you really want LS6 heads look at livernois and TSP. The reason I went with 5.3s is because people seem to get great results with reverse split cams and the 5.3s.

BigKap94z

iTrader: (47)

How much clearance are we talking here? I have no clue how that would clear with any kind of safe clearance with stock heads, let alone with the stage 2 Patriot heads. For instance, the G5X3 112 LSA I have seen had only .074" clearance on the intake(234/242). Gunnar at patriot has told me personally that the 2.05" intake valve in the stage II heads will kill another almost .030" intake clearance with everything else being equal. Not trying to pick a fight here, i'm just curious.

99ssleeper

iTrader: (98)

Not sure..they might be 5.3s...6.0s are a 4" bore. Someone will chime in. I have a set of stock LS6 heads that I'm toying with the idea of sending to TEA to have ported. They get $900 plus shipping to have them do that.

TheLS1Kid

iTrader: (12)

Yes I am curious too.

I have the old style welded chambered 59cc Patriot heads. With my 233/239 I know im borderline with PTV clearance. Your cam is MUCH larger than mine so it is hard to believe, but I hope its true cause I'd like to go a little larger in the future.

Matt87GTA

How are they able to call the head an LS6 head if it is not an LS6 head?? A port profile from a CNC machine is still nothing more than a porting process and it doesn't change what the head was when it started... If it is a 5.3 head, wouldn't it have the small chambers then? I was looking at the 64cc chambered ones...

BigKap94z

iTrader: (47)

I have a pair of the old style ones here as well, and when I get my stock heads off I will measure to get an exact number. My cam is a custom, with only 230* on a somewhat tight LSA and I am 100% sure it wouldn't clear by safe margins since It was only almost .090" on the intake before with .051" headgaskets, and stock 241 heads.

itslow

iTrader: (4)

The Patriot LS6 heads currently available are machined 243 castings. Deck is milled to achieve desired chamber volume & no longer welded.

Matt87GTA

As an example, my 383 in my GTA has Brodix Track 1 heads that were CNC ported right from Brodix (M2 Race Systems specifically does their porting) but they are still "Brodix Track 1 heads"....

Matt87GTA

And a 243 casting is?

ArklaTexan

iTrader: (24)

My Valves on the 59cc are 2.02 not the 2.05. Patriot has several different castings with 59cc 64 cc etc. Some have 2.02 some 2.05. I have right at .07 with these heads.

Zitty'sZ

iTrader: (29)

The 243 castings are LS6 heads .