head CR question ??
Thread Starter
Melting Slicks
Joined: Nov 2009
Posts: 2,536
Likes: 15
head CR question ??
Looking for some info on my thoughts:
Currently its a stock rotating assembly LS6 with a V3 cam. If memory severs me correct the LS6 is a 10.5 CR.
Cam specs; duration @ .050 I=231 E=234
Lift I=.644 E=.598
My question is this, I have a set of 317's laying around and was wondering about milling them down to around 61cc to achieve a 11.0 CR. (could someone check the math) And then recessing the valves to gain some PVC, roughly a .030 recess.
Just looking to squeeze a little more out of my LS6. From the researched I've looked at, milling .030 will net me roughly 3cc's. I understand the 317's are 72cc, I was just giving a mathmatic example using the 243.
And looking for opinions on head gaskets. The total result I'm looking for is a 11.0 LS6 with the current cam combo. I will also have the runners cleaned up a little while this is all being done.
Any idea what kind of flywheel HP this will yeild ?? I'm thinking 25-50 depending on tune and manifold/TB choices.
Thanks for the help in advance...
Currently its a stock rotating assembly LS6 with a V3 cam. If memory severs me correct the LS6 is a 10.5 CR.
Cam specs; duration @ .050 I=231 E=234
Lift I=.644 E=.598
My question is this, I have a set of 317's laying around and was wondering about milling them down to around 61cc to achieve a 11.0 CR. (could someone check the math) And then recessing the valves to gain some PVC, roughly a .030 recess.
Just looking to squeeze a little more out of my LS6. From the researched I've looked at, milling .030 will net me roughly 3cc's. I understand the 317's are 72cc, I was just giving a mathmatic example using the 243.
And looking for opinions on head gaskets. The total result I'm looking for is a 11.0 LS6 with the current cam combo. I will also have the runners cleaned up a little while this is all being done.
Any idea what kind of flywheel HP this will yeild ?? I'm thinking 25-50 depending on tune and manifold/TB choices.
Thanks for the help in advance...
Last edited by LSOHOLIC; Mar 9, 2011 at 08:22 PM.
Thread Starter
Melting Slicks
Joined: Nov 2009
Posts: 2,536
Likes: 15
8....wow.... Seems low, but maybe not. With the ports being cleaned up with some porting on the manifold and some porting/cleaning of the TB. Still hoping for 35ish, if not all this work would not seem worth it.
If thats the case whats your guess of lets say a PRC 2.5 6.0 heads ?? Thats basically what I'm duplicating without the $$(bling, bling). Word on the street is the PRC 2.5 6.0 is worth 35ish. So by your estimation 25 of that is in the port/chamber, I find that hard to believe.
Looking forward to hearing your stance...
If thats the case whats your guess of lets say a PRC 2.5 6.0 heads ?? Thats basically what I'm duplicating without the $$(bling, bling). Word on the street is the PRC 2.5 6.0 is worth 35ish. So by your estimation 25 of that is in the port/chamber, I find that hard to believe.
Looking forward to hearing your stance...
Last edited by LSOHOLIC; Mar 9, 2011 at 09:27 PM.
Melting Slicks
Joined: Dec 2006
Posts: 2,186
Likes: 2
From: Woodinville WA
8....wow.... Seems low, but maybe not. With the ports being cleaned up with some porting on the manifold and some porting/cleaning of the TB. Still hoping for 35ish, if not all this work would not seem worth it.
If thats the case whats your guess of lets say a PRC 2.5 6.0 heads ?? Thats basically what I'm duplicating without the $$(bling, bling). Word on the street is the PRC 2.5 6.0 is worth 35ish. So by your estimation 25 of that is in the port/chamber, I find that hard to believe.
Looking forward to hearing your stance...
If thats the case whats your guess of lets say a PRC 2.5 6.0 heads ?? Thats basically what I'm duplicating without the $$(bling, bling). Word on the street is the PRC 2.5 6.0 is worth 35ish. So by your estimation 25 of that is in the port/chamber, I find that hard to believe.
Looking forward to hearing your stance...
Really, Duplicating a CNC ported head yourself?
The results will be what they are regardless of best wishes; wish you good results though.
Thread Starter
Melting Slicks
Joined: Nov 2009
Posts: 2,536
Likes: 15
--------------------------------------------------------------------------------
I was trying to build the PRC 2.5 6.0 without the $$(bling, bling). Recessed valves $175 and milled $75 and that for both heads. SDPC has a CNC program for cathedral heads, if I remember right they told me roughly $600 for the pair.
Trying to build the heads up so I could do a head swap in a weekend and the car would not be down long. I was under the impression that the 317's and the 243's were identical, so I was thinking mill the chamber down the with the port work and valve recess . Looking to squeeze the last 35-40 HP out of the motor.
I was trying to build the PRC 2.5 6.0 without the $$(bling, bling). Recessed valves $175 and milled $75 and that for both heads. SDPC has a CNC program for cathedral heads, if I remember right they told me roughly $600 for the pair.
Trying to build the heads up so I could do a head swap in a weekend and the car would not be down long. I was under the impression that the 317's and the 243's were identical, so I was thinking mill the chamber down the with the port work and valve recess . Looking to squeeze the last 35-40 HP out of the motor.
Thread Starter
Melting Slicks
Joined: Nov 2009
Posts: 2,536
Likes: 15
Don't know where you assumed myself(CNC)...but no. But you didn't really answer the question. Whats your idea of the RWHP value of the PRC 2.5 6.0's ?? Or better yet, whats your word of the "street" interpretation of there RWHP value ??
Last edited by LSOHOLIC; Mar 9, 2011 at 11:45 PM.
Melting Slicks
Joined: Dec 2006
Posts: 2,186
Likes: 2
From: Woodinville WA
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Melting Slicks
Joined: Dec 2006
Posts: 2,186
Likes: 2
From: Woodinville WA
http://www.totalengineairflow.com/pr.../gmhead/gmls6/
A lot of ported stock heads are crap. For instance, I only gained 35whp with a set of Livernoise ported heads and a small cam too
So I've been there; nothing worse than putting in all that money and effort for peanuts.
Thread Starter
Melting Slicks
Joined: Nov 2009
Posts: 2,536
Likes: 15
Thanks, but I've talked to west coast cyinder heads and TEA and the prices they where talking were out there $$. Maybe I need to tell them I'm on a budget ! I'll call them again this week and check again. Thanks again..
I'll call them again this week and check again. Thanks again..
Melting Slicks
Joined: Dec 2006
Posts: 2,186
Likes: 2
From: Woodinville WA
Make sure they know you're giving them cores, b/c that alone will add $800 if they think you're buying them outright.
Thread Starter
Melting Slicks
Joined: Nov 2009
Posts: 2,536
Likes: 15
Just FYI, talked to West Coast Cylinder Heads today and....$1400 is what it would take with my heads sent to them. Which includes CNC port work, milled to my specs and valve recess if nessesary. They have no cores to do a swap out with, got to send mine to Cali. So I'm probably going to live with my current combo, just can't see the car being down, all the labor and out at least $1700 for 35 RWHP.
TEA was closed but there probably competatively priced to West Coast. And its probably not a conscience that the PRC 2.5 6.0's are basically the same price.
Thanks....
TEA was closed but there probably competatively priced to West Coast. And its probably not a conscience that the PRC 2.5 6.0's are basically the same price.
Thanks....
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
Look at these instead
http://www.hinsonsupercars.com/p-571...assembled.aspx
Price: $1,295.00 complete no core exchange
http://www.hinsonsupercars.com/s-487...ed-ls6ls2.aspx
IF WWC is using L92 heads, these dont work too well on an LS1/LS6 block
http://www.hinsonsupercars.com/p-571...assembled.aspx
Price: $1,295.00 complete no core exchange
http://www.hinsonsupercars.com/s-487...ed-ls6ls2.aspx
IF WWC is using L92 heads, these dont work too well on an LS1/LS6 block
Last edited by AU N EGL; Mar 11, 2011 at 06:59 AM.
