GM LS6 CNC ported heads
GM LS6 CNC ported heads I'm seriously leaning towards these.
Anybody know actual compression on these?
How much cam can the springs take?
I'm toying with the 'Grand am cup cam' (239/251-.570 lift-106 LSA)and these heads.
Throw some ideas at me.
This will be for an 'all out drag racing machine' <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Anybody know actual compression on these?
How much cam can the springs take?
I'm toying with the 'Grand am cup cam' (239/251-.570 lift-106 LSA)and these heads.
Throw some ideas at me.
This will be for an 'all out drag racing machine' <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
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Joined: Dec 2002
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From: Novi, MI
Re: GM LS6 CNC ported heads Do you have the part #? I was looking at this set, or one just like it from GM. I've got the specs on the ones I looked at, but I'm not sure if they're the same ones. I talked to the guys at Thunder Racing and the general consensus was to go elsewhere. It turned out that the heads were milled (which LS6 heads don't need) and it raised compression even more and made the combustion chamber 57-58cc. It also required some valvetrain measurements to ensure valve clearance. I'll try to find the description and see if you can get a part #.
But I've decided to take Thunder Racings advice and look into a good set of stage 2 LS1 heads.
But I've decided to take Thunder Racings advice and look into a good set of stage 2 LS1 heads.
Re: GM LS6 CNC ported heads Chambers were 60cc?I looked at the ones from SDPC.
I do want higher compression.
11.0-12.0 is fine with me.
I am looking for maxium power for a drag racing application.
I do want higher compression.
11.0-12.0 is fine with me.
I am looking for maxium power for a drag racing application.
Re: GM LS6 CNC ported heads I will say these heads are best bang for the buck. GM made the cnc program for them so im sure they are as efficent as they can be with stock valve size "machiend by lingenfelter". Id put these heads up againest anyones stock valve hand ported head and im sure they wont beat it. I have cliped off 11.30@120.74 and every time i go to the track i get faster with tuning my car. It is not light either 3560 race weight. I run the gm asa cam, im sure it would go faster with the cup cam. And i had no clearence problems plenty of piston to valve clearence. Its 11.0 compression and i run normal pump gas. Remember these are not stage 2 heads they are stage one heads, but they are making the power down the track like a stage 2 head. I made 408 rwhp. Another thing is these are brand new casting, not a head that you dont know what it has gone threw. And the heads are built to tight tolerences otherwise gm would not sell them. It would not pass there quality control. Most of the porters/headbuilders out there do not have the equipment to make everything equal and perfect IE."valve guide clearence, valve seat depth, spring pocket height". You could buy one today and one 6 months from now and compair them. Unless gm made a change the will be exacly the same. Bottom line these heads are 2100 with bolts and gaskets to your door. When the other guys are charging 2700 "heads only" for there ls6 stage 2 heads and they dont go any faster. id say there are best bang for the buck.
george
george
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From: new england
Re: GM LS6 CNC ported heads I like these CNC heads but the runner volume concerns me.Arent they like 235cc on the intake? How does a 346 take full throttle at lower and mid range rpm with these heads? I know that port volume is a one dimensional view of port, and placement of material removal could allow good port airspeed with a large volume, but large short side area and bowl casting limits make LS1/LS6 ports difficult to enlarge enough to that 235cc size with out resorting to hogging rest of port making head lazy at all but peak flow and rpm conditions. How about some driveability reports from owners of these heads?
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Joined: Apr 2002
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From: Austin, TX
Re: GM LS6 CNC ported heads I second what 2002nhraformula said these heads are awsome. We put these on my 99 T/A and a custom cam with a 588 lift and man it runs like a scalded ape!!! The heads flowed 307, we did have to cut valve reliefs on the intake side but nothing to big. For the price and performance you can't beat them!! <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" /> <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" /> <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
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Re: GM LS6 CNC ported heads LS1derful - most of your questions and thoughts are addressed in this thread begun by J-Rod.
https://ls1tech.com/ubb/ultimatebb.p...=008977#000000 <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" /> <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" /> <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
<small>[ December 08, 2002, 02:16 AM: Message edited by: binksz06 ]</small>
https://ls1tech.com/ubb/ultimatebb.p...=008977#000000 <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" /> <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" /> <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
<small>[ December 08, 2002, 02:16 AM: Message edited by: binksz06 ]</small>
Re: GM LS6 CNC ported heads 250cc <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> Wouldn't there be a better benefit running bigger intake valves and get the same flow with a smaller runner?
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Re: GM LS6 CNC ported heads </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> 250cc Wouldn't there be a better benefit running bigger intake valves and get the same flow with a smaller runner?
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">SDPC says they tried bigger valves and they did not increase flow- Lingefelter really did their homework on these heads. Lingenfelter ( Ed Potter) says they can increase flow with some further sanding and larger (2.02)valves. Should flow 310-314 cfm range at 0.600"lift. I'm going to send mine up to Lingenfelter as soon as they come in (ordered over 3 wks ago). Also I believe these heads were originally flowed with an intake and 12" pipe bolted on ( GMs Specs). See above link in previous post. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">SDPC says they tried bigger valves and they did not increase flow- Lingefelter really did their homework on these heads. Lingenfelter ( Ed Potter) says they can increase flow with some further sanding and larger (2.02)valves. Should flow 310-314 cfm range at 0.600"lift. I'm going to send mine up to Lingenfelter as soon as they come in (ordered over 3 wks ago). Also I believe these heads were originally flowed with an intake and 12" pipe bolted on ( GMs Specs). See above link in previous post. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
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Joined: Aug 2002
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From: Maple Grove MN
Re: GM LS6 CNC ported heads I have a set of Agostino Racing Stage 2 heads with very low miles on them. Probably less than 4000. If somebody wants them I'm asking less than 2K. They are over $2700 new plus a core exchange.
Justin
Justin
Re: GM LS6 CNC ported heads for sale is another forum <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
i REALLY want to see these heads on a full bolt on and programed car. i think these would work REALLY well!
i REALLY want to see these heads on a full bolt on and programed car. i think these would work REALLY well!
6600 rpm clutch dump of death Administrator
Joined: Dec 2001
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From: Texas
Re: GM LS6 CNC ported heads Just keep in mind that 60cc is what many vendors aim for on the heads they are shipping to customers. A stock ls6 head is about 66-67cc a milled CNC head is only 60cc. So, not a huge jump in compresion...
Re: GM LS6 CNC ported heads Does anyone have flow charts on these and a stage 2 LS1 head?
See,I already have a set of 98 heads and the 01's that are on my car.
I am looking for what will bring me the most power.I like these LS6 heads,
cause I will need them down the road(more cubic inches).
I may just send the 98's to TEA for a stage 2 package.I'll do nice valve covers
and relocate the coil packs.Just exploring all the options.
Which head will bring me the most power?
Feel free to also give me cam suggestions.
Thanks
See,I already have a set of 98 heads and the 01's that are on my car.
I am looking for what will bring me the most power.I like these LS6 heads,
cause I will need them down the road(more cubic inches).
I may just send the 98's to TEA for a stage 2 package.I'll do nice valve covers
and relocate the coil packs.Just exploring all the options.
Which head will bring me the most power?
Feel free to also give me cam suggestions.
Thanks
Re: GM LS6 CNC ported heads </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by gator's 99TA:
<strong>for sale is another forum <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
i REALLY want to see these heads on a full bolt on and programed car. i think these would work REALLY well!</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">whats my car i have them im a bolt on car with a cam and these heads and im programed pritty good
george
<strong>for sale is another forum <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
i REALLY want to see these heads on a full bolt on and programed car. i think these would work REALLY well!</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">whats my car i have them im a bolt on car with a cam and these heads and im programed pritty good
george