waterbug1999

iTrader: (3)

Kind of what the title says. I am tore between the 2. Besides the small $$ difference. What makes one better then the other. Or am I just "splitting Hairs" as JRP puts it.

Just want a weekend warrior and a fun drag car. Not my daily driver either.

Let me know.. thanks

MUSTANGEATER

iTrader: (10)

I would probably go with the LS6 style heads.

waterbug1999

iTrader: (3)

Yea, you really cant beat the price. I think the quality of the PP heads have been stepped up as well.

Was thinking of the LS6 III's as they have slightly bigger valves and will net more flow. But, I would think that I would have to go with a smaller cam? correct?

Like your call sign.. I killed 3 at the track last time I went!!

PREDATOR-Z

It will depend on the cam you'll run and your power range desired.

waterbug1999

iTrader: (3)

I would like to hit the 400 mark. since I have an A4 and a 4K stall I think that it will be kinda hard.

PREDATOR-Z

Get a cam that allows you to run 11.0>11.5:1 with a quench of .030>.035 without notching the pistons. Quench is relative to your piston to deck measurement and your gasket thickness
Quench = PTD - Compressed Gasket thickness.
you do not have to think too big to make 400. I'm at 429 with a 224/220 cam and PRC 2.5/ 5.3L and 11.0:1 static Compression

waterbug1999

iTrader: (3)

Yea, those are the things that I try to understand but just dont get. Thats why I am kind of asking what will work the best with what heads. I understand that the thinner the gasket the more compression, but that also gives you less height thus limiting the PTV clearance. Man I am dumb..

orangeapeel

iTrader: (18)

depends on if you get them compression milled as well.

waterbug1999

iTrader: (3)

Maybe Gunnar will chime in and tell me if they come milled or not. I dont think their website says if they do or dont.

I looked, and it said the LS6 are "Milled to OEM deck height". And the 5.3's did not say anything on their website.

PREDATOR-Z

yeah, that is because the 59cc are welded chambers so they should be OEM, but valves are bigger so PTV changes.
This is why I said choose the heads, compression and gasket, then trow in a cam that fits without notching.
You'll make more power that way, than running bigger cam with less Compression and wider quench.

waterbug1999

iTrader: (3)

Thats what I am one here for.. To find out all this stuff.... So, if I do decide to get the 59cc Stage III LS6 heads. What gasket to get that will raise my compression? A .045 will be around 11.2?

PREDATOR-Z

http://www.rbracing-rsr.com/compstaticcalc.html
average piston deck height is .007 out of hole, so negative figure is needed in the calc.

With 59cc chambers and .045, you are looking at 11.66
With a 62 cc 5.3 and .045, you are looking at 11.2
with 64cc 5.3 and .045, you are looking at 10.91
With 64 cc and .040, you are looking at 11.05
and with 62cc and .040 it is 11.34

that should give you an idea. Mind you these calcs are close ballpark, actual will differ a tiny bit.

Z'mnypit

iTrader: (58)

I wouldnt go with a stage 3 head, without bigger displacement. PP heads arent milled unless you want them milled. I just had a set of PP stage II LS6 heads with 2.02 intake valves, 1.60 exhaust valves, & 62cc combustion chambers, with the stock height gasket that they provide I had no PtoV clearence issues. The CR was right at 10.7-1 & best of all, the heads pulled like a raped ape, with the F13 cam.

Gunnar@Patriot

iTrader: (20)

Vann is right, our heads will be at factory height. The stage II head would better suit your needs. If we do a 59cc chamber with the GM MLS gaskets we send, you will have approx. 11-1 compression.

JS

iTrader: (4)

Yes but the .54 gasket - the .007 = a quench of .047...Thats not the best quench,I'd look into a PP S2 62CC head with the Cometic .045 and run a quench od .038...

waterbug1999

iTrader: (3)

Some sweet info guys.. Thanks. One last question:

The only difference between Stage II & III are just the valve size and CC options. So, why would I choose stage II (less flow) over the III (more flow). Is that a no brainer or am I missing something?

SporkLover

iTrader: (2)

Question.... have you thought about waiting for some of the aftermarket casts coming out this winter after SEMA and having those worked over?

DART has a 225 Runner head that flows 300 @ .500 .... http://www.dartheads.com/manager/uploads/LS1Flyer.pdf

Jegs has those listed as 640 per head assembled.... and I do believe that is slightly cheaper than LS6 heads

waterbug1999

iTrader: (3)

Yea, I read about those. And I might just do that. But, like I have always heard, if its sounds to good to be true, then it probably is.. But, i guess we will see.

waterbug1999

iTrader: (3)

UPDATE... Well, I just called JEGS and ordered a pair of the 225CC Dart heads..

So, I guess I'll be one of the first to test them out straight out of the box. Only $1289 shipped to my door.

fotoboy

iTrader: (1)

gunner told me that with stock bore you will run into shrouding issues with bigger valves resulting in less flow.