Vrbas

iTrader: (2)

I know this has been beaten to death but i'm still stuck debating which one to go w/..... a set of 5.3 heads or LS6 heads.

Of course the companies i have to choose from are the usual... TSP and Patriot... though i am leaning more toward Patriot but i'm still open to opinions.

Anyways, my setups is as follows:

My Setup
- 99 WS-6 (M6)
- Lid
- LS6 Intake
- Pacesetter LT's (ORY)
- 3.73 rear
- 228/232 112LSA ~.600 XER

My Goals
- ~430 HP
- 11's at the track
- Great low to mid pull but still some yank up top

Sorry to post this beaten thread again, but i need to decide soon and i figure different heads for different setups... hope i narrowed it down. Thanks in advance.

fueledpassion

If I were you, I would get the flow numbers for each set of heads. When I say flow numbers I mean from .200" all the way to .600" lifts. Obviously 300CFM @ .600" is plenty for your setup, but I would check to see which ones flow better from .200"-.400" lifts. Since your looking for good low-mid range, you'll need a head setup for good low to mid range power. After choosing which head to go w/ call a cam pro up and have a custom grind setup just for your application. This is the best way to have a big powerband coupled w/ good response and torque. That's just what I would do..picking a random head that has the best results w/ peak power isn't the direction to success w/ your setup. You have specific requirements, so you need specific flow numbers and specific durations, lifts, etc. for your setup. Also, the one w/ the smallest CC chambers will result in the best response, so keep that in mind.

Evans752

iTrader: (29)

I would get the Patriot stage II LS6 heads out of the choices because with the 5.3 heads and the 600 lift you say you have or getting you might run into piston the valve clearance problems. But the 5.3 would give you more compression. I would look at the Trick Flows to. Good Luck

CriminiSS

iTrader: (16)

I have a bias to the TSP 5.3's. I love my setup w/ the tr 230 reverse split. made 423 rwhp and 385 tq on a mustang dyno and thru a 9inch w/ 4.10's. The best part is my dyno graph is super flat. get the tsp 5.3's.

Vrbas

iTrader: (2)

So the reasoning behind the 5.3's over the LS6 are...

(sorry, i'm retarded and need things spelled out for me )

Rhino79

iTrader: (7)

Compression. My vote is for the PRC 5.3's, compression is your friend.

Firehawk441

iTrader: (41)

In your particular application and goals, The 5.3 heads sounds like the better choice to me. TEA also does a terrific job with these heads and won't break the bank.

Ragtop 99

iTrader: (7)

5.3s make a good budget head. Higher compression and good flow when ported.

Vrbas

iTrader: (2)

thanks for all the help and opinions.

I guess it would be a wasted effort to ask whether to go w/ Patriot or PRC (though i know PRC tends to be more popular, just saying along the lines of an A > B scenario, if applicable).

silverLSWON

iTrader: (16)

5.3 heads all the way!! when you get more cubes, then you want alot more flow.

RevGTO

iTrader: (12)

Higher compression is your friend as long as the fuel you plan to run can handle your new DCR.

Vrbas

iTrader: (2)

I'm guessing just your basic premium gas at a local station isn't going to cut it then?

Also, is there a reason PRC seems to get more votes than PP? At least on the performance side (aside from being the more popular choice)?

98TAbodnar89

ls6 is my call

on a good day i will run mid 10s and always have 513hp

RevGTO

iTrader: (12)

It might. Depends on your DCR and what the best locally available octane is. Here it's 91 and I get KR with stock compression and timing. You just have to plan for what fuel you'll use when you pick the size of your combustion chambers and spec your cam. Patrick or somebody on here had a DCR/octane chart that would be helpful if you could find it.

ArrestMeRed99Z28

iTrader: (1)

I don't think that you should pick the head based on compression alone, because you can have the heads milled to whatever compression you want, I'd call or e-mail TSP and Patriot and see what the flow numbers are for a milled 5.3 head vs a milled LS6 head, the one with the best flow where you want it with your desired compression is the right one for you.

AJ

BOWTIE

I would say go with the 5.3's from PRC, or the LS6's from PP. I have not heard folks bragging about results from the PP 5.3's like they do the PRC's. From what I gathered from Jason at TSP, since the 5.3 starts with a smaller intake runner, they are able to cnc the port and get it where they want it for outsatnding flow numbers while still keeping it smaller in volume to help with the throttle response and tq development down low. When I was discussing these options with him, the 5.3's had the same flow numbers as the LS6's with a 10-15 cc smaller intake port, in addition to the smaller chamber.

radkon

iTrader: (2)

Best advice in this thread. Get the flow figures for both heads with the same chamber volume and then you'll be comparing apples to apples.

Vrbas

iTrader: (2)

What if i milled the heads, would LS6 be a better choice? Say like 62cc?

Vrbas

iTrader: (2)

Bump

slt200mph

iTrader: (42)

TEA has a 5.3 stage 1.5 head that is very good and price friendly too..