2K2WS6TA

iTrader: (2)

Finally got the money for a set of heads and was wondering what set would be better for my T/A its got a TR 224/224 112 lsa cam in it, a set of headers/ory and a catback, and that's it as far as power mods
So which one would be better, it's primarily a show/cruise (including the hot rod power tour) car with a once a year trip to the track, other than that it stays in the garage
My primary concerns are do I need to fly cut the pistons with the cam I have, and the increase in compression (91 octane is the best we can get here) and do I have to upgrade my injectors
So all you gurus, what's your opinion

lemons12

iTrader: (71)

the 5.3s will give you better throttle response, and more bottom end to have fun with..... you wont take advantage of the ls6 heads with a cam that small..

no you will not have to fly cut with either one of those sets of heads..

you will be fine running 91.. you will be ok with those injectors..

regency

iTrader: (15)

theres a guy on here that gained .4 and 5 or 6 mph with the Stg.2 LS6's on a small 226/226 cam from Patriot

lemons12

iTrader: (71)

granted, i do like ls6 heads better.. thats what i went with...



but, he said he hardly went to the track.. and the 5.3s and ls6's arent far apart as far as power goes.. but the 5.3s will make it more snappy.. meaning more fun

JakeFusion

iTrader: (7)

5.3s are 220cc and flow 3-5cfm more from .300" to .600" over the LS6s... the LS6s are 226cc heads.

The 5.3s flow more with a smaller runner, but the LS6s have smaller valves, which make up for the increased runner volume. Overall, they should perform similarly. The difference will be in the compression - the 5.3s provide more compression and more piston-to-valve cleance than the LS6s. Therefore, I voted for the 5.3s.

lemons12

iTrader: (71)

on a flow chart ls6s will outflow the 53s.. 53s give more compression... they are damn near the exact same head when it comes to actual power though, the ls6 should make more power

c0ncEpT

iTrader: (4)

They will make very similar power but the 5.3 head will provide more torque because of the added compression.

lemons12

iTrader: (71)

its a fraction.. nothing you would actually see at the track.. you might pick up a ITTY ITTY BIT on the dyno, but not even enough to see a drop on your 60..

the reason TSP talks the 5.3s up so much more than the ls6's is because they make a lot more money off of the 5.3 than they do the ls6's..

lemons12

iTrader: (71)

there is as much difference in the bumped compression as there is the flow numbers... pretty much no difference..

PREDATOR-Z

5.3L with that cam, no mill, perfect

lemons12

iTrader: (71)

...anything else? lol

fastvet

iTrader: (2)

5.3L Stage 2.5 with that cam!!!

TVWilkes

That is not true. The 5.3 heads, IMO, will make a little more power on compression. Since you only have 91 octane gas, make sure you can get a spot on tune and go with the 5.3L.

Abdullah

iTrader: (2)

I think the LS6 heads will make more power than the 5.3L heads even with the 5.3L heads having the smaller chambers.

Jason 98 TA

iTrader: (4)

Don't worry Mr.2k2 I have dyno graphs comparing them for you. Give us a call & we can get you all kinds of dyno data to help with your decision.

I prefer the Stage 2.5 5.3l heads for the camshaft we're discussing. We can set you up with free milling & thinner gaskets if your looking for the max possible HP gains from this setup.

Jason
Texas Speed

Jason 98 TA

iTrader: (4)

Here's a dyno sheet comparing a few different head combos we tested last time on the engine dyno

http://www.precisionracecomponents.c...comparison.jpg

Jason 98 TA

iTrader: (4)

This is a completely inaccurate statement. We actually make more on LS6 heads than 5.3l heads. This is a good example of someone with no actual knowledge about us making a B.S. statement.

The reason we typically like the Stage 2.5 5.3l head is:

• CHEAPER THAN STAGE 1 LS6 HEADS WHEN YOU GET A SPRING KIT
  
• ENGINE DYNO TESTING SHOWS BETTER POWER GAINS COMPARED TO 2" VALVE LS6
  
• CUSTOMER GETS STAINLESS / LARGER VALVES FOR LESS MONEY!!

Ksths2

iTrader: (1)

i'm confused since you can get the PRC LS6 ported heads with the smaller 59cc combustion chambers and 2.02/1.57" valves to match the 5.3 heads.......aka wouldn't that be the samething but flow a bit more than the 5.3L heads?

Jason 98 TA

iTrader: (4)

Yes the 2.02 1.57 valve combo in the LS6 head is a nice combo. But unfortunately it costs more than the stage 2.5 5.3l heads. For the money the 5.3l makes really, really good power

fastvet

iTrader: (2)

Jason, your graph shows PRC 215cc heads and PRC Stage 2.5 5.3L heads. I thought the 5.3L heads were the 215's. Or was that the comparison between the stage 1 5.3's vs. the stage 2.5 5.3's. Just wondering, cuz Im a little confused if that was what the graph was about or if it was about the LS6 heads vs. the 5.3L heads? Thanks in advance!!