Looking for input on 243 head options
Looking for input on 243 head options I finally assembled all of the other required items for the head upgrade so Im looking to order heads sometime this week and Im looking for input/opinions.
The car is a 2003 Z06 with a FAST 90/90, Long tubes, and a comp 230/232 592/595 111.
The car is primarily a daily driver that sees the occasional auto cross and track event. What Im looking for is 243 heads, under $2000, and my primary concern is low end torque more than high end horse power and big dyno numbers.
Ive gone through the search function, and looked at a number of options, and right now Im leaning towards the Livernois Stg 3 243 heads milled to 61ccs but Im open to any and all suggestions.
Thanks
The car is a 2003 Z06 with a FAST 90/90, Long tubes, and a comp 230/232 592/595 111.
The car is primarily a daily driver that sees the occasional auto cross and track event. What Im looking for is 243 heads, under $2000, and my primary concern is low end torque more than high end horse power and big dyno numbers.
Ive gone through the search function, and looked at a number of options, and right now Im leaning towards the Livernois Stg 3 243 heads milled to 61ccs but Im open to any and all suggestions.
Thanks
TECH Addict
Joined: Sep 2009
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From: PA/MD
2quik4u has the same opinion I do....for the money you cant go wrong....you might see if they do an exchange, so there is less down time for you....that way as soon as they get your heads they can send the new ones right out
AI would be my vote as well. TEA, Texas speed, and Livernois sell ported/will port 243s as well. In the dyno section recently was a Z06 that made great numbers with Livernois Stage 3s I believe.
Yea I saw that thread about the Livernois heads. I contacted TEA about a core exchange, which they said they would usually do, but didn't have any 243's in stock at the moment. I may give AI a shout this week to see if they'll either sell a set outright, or do an exchange.
TECH Senior Member
Joined: Feb 2009
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if you could find some used air flow research heads for $2000 that would give you the power you want.look at some Texas Speed heads .you can find used 243/799 heads for $400 used ,then send them to the mentioned shops for porting .
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Yea I saw that thread about the Livernois heads. I contacted TEA about a core exchange, which they said they would usually do, but didn't have any 243's in stock at the moment. I may give AI a shout this week to see if they'll either sell a set outright, or do an exchange.
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Do you really think that at 61ccs the PTV clearance will be that close? I realize the only way to know for sure is to measure with the heads on the car....TEA actually suggested the milling to 61cc with the factory head gasket and my cam, they said I wouldnt have an issue.
Launching!
Joined: May 2010
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Do you really think that at 61ccs the PTV clearance will be that close? I realize the only way to know for sure is to measure with the heads on the car....TEA actually suggested the milling to 61cc with the factory head gasket and my cam, they said I wouldnt have an issue.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
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From: BFE
Usually, off shelf cams are +4, the V1 was Compcam XER. At 61cc, stock valve and gasket, it will be too close.
Even at 62cc, my advice is measure PTV clearance with a dial indicator and based on that make a judgment. I would not run less than .070 on the street and .090 exhaust.
If it were me, I would install heads with ARP studs unmilled. measure then decide if I could mill and by how much.
Even at 62cc, my advice is measure PTV clearance with a dial indicator and based on that make a judgment. I would not run less than .070 on the street and .090 exhaust.
If it were me, I would install heads with ARP studs unmilled. measure then decide if I could mill and by how much.
Ok thanks for the input....my LS rebuild manual said not to go below .080 on the intake and .100 on the exhaust on a street car so I may just keep it at the factory 64cc chambers. Again I'm more concerned about reliability than squeezing every last ounce of power out of it
i'll go against the grain here and suggest you stick with your original 243s.if your not concerned with all out power,your stock heads should work fine..maybe have AI freshen them up a bit with a good VJ and make sure the surfaces are flat..it all depends on how much your willing to spend per HP i guess..and listen to Pred about the P/V clearance..
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
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From: BFE
Ok thanks for the input....my LS rebuild manual said not to go below .080 on the intake and .100 on the exhaust on a street car so I may just keep it at the factory 64cc chambers. Again I'm more concerned about reliability than squeezing every last ounce of power out of it
I usually flycut when I mill heads to raise compression. GM should make it standard operation to have their OEM slugs with reliefs IMO)
On my setup (sig) I have .100 intake and .120 exhaust with my 2cc reliefs. That is a pure street setup.
Keep in mind that a CNC ported head will have chamber work therefore increasing chamber size (not 64.5cc) as stock. So to mill to a certain smaller cc requires more mill than on stock to achieve desired chamber size. Proper protocol requires measuring chamber with burret.
You might consider the PRC 227 heads. Without springs they're 2k, with springs they're 2200. That being said you'll be able to sell your 243 heads & end up with roughly 1500-1700 in the aftermarket casting heads.
The PRC 227 head is the highest flowing current production 3.9" bore cylinder head out there. Its designed as a max effort cylinder head specific for small bore applications! You can get a 59cc chamber and have very close to stock p/v clearance even with the 2.065" intake & 1.60" exhaust valve.
Just something to think about if your looking for the best possible power output
The PRC 227 head is the highest flowing current production 3.9" bore cylinder head out there. Its designed as a max effort cylinder head specific for small bore applications! You can get a 59cc chamber and have very close to stock p/v clearance even with the 2.065" intake & 1.60" exhaust valve.
Just something to think about if your looking for the best possible power output
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Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com