Prc stg 1 heads or prc 5.3 stg 2.5 heads?
03-13-2013, 12:45 PM
#21
TECH Senior Member
Unmilled PRC Stage 1 LS6 heads vs unmilled PRC Stage 2.5 5.3 heads, the PRC Stage 2.5 5.3 heads have smaller chambers, thus creating more compression. More compression is more power. Also, the PRC Stage 1 LS6 heads have stock valves and springs...
In equal combinations I wouldn't say the LS6 heads make more power, but it's more of a wash. Personally I think you get more heads for the price with the PRC Stage 2.5 5.3's. Just my .02 cents.
In equal combinations I wouldn't say the LS6 heads make more power, but it's more of a wash. Personally I think you get more heads for the price with the PRC Stage 2.5 5.3's. Just my .02 cents.
03-13-2013, 02:20 PM
#22
Unmilled PRC Stage 1 LS6 heads vs unmilled PRC Stage 2.5 5.3 heads, the PRC Stage 2.5 5.3 heads have smaller chambers, thus creating more compression. More compression is more power. Also, the PRC Stage 1 LS6 heads have stock valves and springs...
In equal combinations I wouldn't say the LS6 heads make more power, but it's more of a wash. Personally I think you get more heads for the price with the PRC Stage 2.5 5.3's. Just my .02 cents.
In equal combinations I wouldn't say the LS6 heads make more power, but it's more of a wash. Personally I think you get more heads for the price with the PRC Stage 2.5 5.3's. Just my .02 cents.
Stg 2.5 - 5.3 heads are a good option if you don't/can't buy the Stg 2.5 LS6.
The stage 1 LS6 heads are the same as the 2.5, the only difference like you said was the valve size and springs.
Put the springs on to match the cam, it will make more power than the 5.3s.
Besides...milling is free when you buy the heads.
03-13-2013, 10:44 PM
#24
What you can say, like we have and all agree, they are great heads, but the LS6 will make more power with equal combos.
03-14-2013, 08:16 AM
#25
On The Tree
iTrader: (15)
Join Date: Sep 2011
Location: Wausau, WI
Posts: 136
Likes: 0
Received 0 Likes
on
0 Posts
I'm not sure what you're asking if I'm sure about, but obviously we all know more compression equals more power. Yes, from what I've read; unmilled LS6 heads are 64cc chambers while unmilled 5.3 heads are 63cc chambers. I've never measured it myself though.
ummm....Thats exactly why the Z06 corvette, CTSV, and the 6.0 GTO got 243 heads....GM must have missed the mark not putting the 5.3s on them
Stg 2.5 - 5.3 heads are a good option if you don't/can't buy the Stg 2.5 LS6.
The stage 1 LS6 heads are the same as the 2.5, the only difference like you said was the valve size and springs.
Put the springs on to match the cam, it will make more power than the 5.3s.
Besides...milling is free when you buy the heads. I was comparing the stage 1 LS6 heads versus stage 2.5 5.3 heads since that was what the OP was asking. I think spending the extra $100 is worth it for getting the stage 2.5 5.3 heads over the stage 1 LS6 heads. You're definitely getting more heads for you money (bigger valves, better springs).
On a side note, since you keep going back to the stage 2.5 LS6 heads; if I was spending that much money on heads I would buy the PRC As-Cast 225cc heads. Same exact price as stage 2.5 LS6 heads, and way more potential.
ummm....Thats exactly why the Z06 corvette, CTSV, and the 6.0 GTO got 243 heads....GM must have missed the mark not putting the 5.3s on them
Stg 2.5 - 5.3 heads are a good option if you don't/can't buy the Stg 2.5 LS6.
The stage 1 LS6 heads are the same as the 2.5, the only difference like you said was the valve size and springs.
Put the springs on to match the cam, it will make more power than the 5.3s.
Besides...milling is free when you buy the heads.
On a side note, since you keep going back to the stage 2.5 LS6 heads; if I was spending that much money on heads I would buy the PRC As-Cast 225cc heads. Same exact price as stage 2.5 LS6 heads, and way more potential.
03-14-2013, 09:21 AM
#26
TECH Senior Member
Stage 2.5 5.3s that I had had 64cc+
So how much is 0.5 cc worth in SCR?
03-14-2013, 11:42 AM
#27
Dynomite.
Sure go for it. The car made 339/354 full bolt ons on that exact same dyno, so yeah it must read really high.
I think there are what, 3 people in this thread that have actually run the heads, the rest of you are just going by hearsay? The ones that have run the heads love them, the ones that haven't just listen to what everyone on here says, which is 99.7% opinion, 0.2% facts+opinions, and 0.1% facts. Tons of people make great power with the 5.3 heads, but then again tons of people spend wayyy too much money on heads that don't deliver too.
I think there are what, 3 people in this thread that have actually run the heads, the rest of you are just going by hearsay? The ones that have run the heads love them, the ones that haven't just listen to what everyone on here says, which is 99.7% opinion, 0.2% facts+opinions, and 0.1% facts. Tons of people make great power with the 5.3 heads, but then again tons of people spend wayyy too much money on heads that don't deliver too.
03-14-2013, 12:24 PM
#28
Dynomite.
Sure go for it. The car made 339/354 full bolt ons on that exact same dyno, so yeah it must read really high.
I think there are what, 3 people in this thread that have actually run the heads, the rest of you are just going by hearsay? The ones that have run the heads love them, the ones that haven't just listen to what everyone on here says, which is 99.7% opinion, 0.2% facts+opinions, and 0.1% facts. Tons of people make great power with the 5.3 heads, but then again tons of people spend wayyy too much money on heads that don't deliver too.
Sure go for it. The car made 339/354 full bolt ons on that exact same dyno, so yeah it must read really high.
I think there are what, 3 people in this thread that have actually run the heads, the rest of you are just going by hearsay? The ones that have run the heads love them, the ones that haven't just listen to what everyone on here says, which is 99.7% opinion, 0.2% facts+opinions, and 0.1% facts. Tons of people make great power with the 5.3 heads, but then again tons of people spend wayyy too much money on heads that don't deliver too.
03-14-2013, 12:53 PM
#29
Roughly 0.10??? The extra 3/4hp is a big difference to some Predator.
OP, I chose the Prc 5.3 2.5 heads over the Prc stage 1 LS6 heads and don't have a single complaint or regret. With my 227/230 cam and LS6 intake, power peaks 432whp at 6300rpm and carries over 425whp from 5800 to 6600rpm. I agree that the LS6 stage 1 and 5.3L stage 2.5 are a toss-up which head is actually better.
OP, I chose the Prc 5.3 2.5 heads over the Prc stage 1 LS6 heads and don't have a single complaint or regret. With my 227/230 cam and LS6 intake, power peaks 432whp at 6300rpm and carries over 425whp from 5800 to 6600rpm. I agree that the LS6 stage 1 and 5.3L stage 2.5 are a toss-up which head is actually better.
Last edited by R6cowboy; 03-14-2013 at 01:02 PM.
03-19-2013, 04:13 PM
#33
I like the LS6 style heads, but you will be happy with either IMHO!
