GM CNC ported heads?
Safety Car
Joined: Mar 2002
Posts: 4,928
Likes: 1
Cruise-In V Veteran
St. Jude Donor '09
Mine are the 60 cc head. I've never had a problem with knock.
I run NGK TR6s in the summer heat and TR55s the rest of the time. Running a cooler thermostat helps of course - I run a 176*F Tstat in summer.
I run NGK TR6s in the summer heat and TR55s the rest of the time. Running a cooler thermostat helps of course - I run a 176*F Tstat in summer.
Race Director
Joined: Nov 2005
Posts: 14,554
Likes: 1,550
From: Supporting the Corvette Community at Abel Chevrolet in Rio Vista, CA 707-374-6317 Ext.123
St. Jude Donor '08
Originally Posted by turboc5
Wow thats impresive, I would be very happy with 450rwhp. Since you have 61cc heads, how is it on pump gas? Thanks for the offer but I too work at a dealership that sells cadalic. Thats what got me interisted in the heads and then I found out Lingenfelter did all the work. 
Last edited by RichieRichZ06; Jan 16, 2006 at 11:53 AM.
Intermediate
Joined: Sep 2000
Posts: 39
Likes: 0
From: Diamondhead MS
I'm running the 65cc heads on my GTO along with the baby cam GT2-3. Only put up 390/380 after tuning. Runs absolutely perfect and sounds completely stock. Very nice sleeper package. Waiting for the tracks to open to see how it does. Previous cam only ran 12.57@111.71.
But I think I'm going to step up on the cam after this summer. What's everybody running? I see a couple are running bigger cams with very good results
I want a cam that matches the flow characteristics of these heads. So it looks like .600 lift would be the max from the flow results I've seen.
FWIW, mine are untouched. I do run a .045 Cometic gasket to bump up the compression to about ~10.7:1.
But I think I'm going to step up on the cam after this summer. What's everybody running? I see a couple are running bigger cams with very good results
I want a cam that matches the flow characteristics of these heads. So it looks like .600 lift would be the max from the flow results I've seen.FWIW, mine are untouched. I do run a .045 Cometic gasket to bump up the compression to about ~10.7:1.
Race Director
Joined: Nov 2005
Posts: 14,554
Likes: 1,550
From: Supporting the Corvette Community at Abel Chevrolet in Rio Vista, CA 707-374-6317 Ext.123
St. Jude Donor '08
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I have a 228/228 .590/.590 112lsa and it is great. It has a muscle car idle that shakes the antenna back and forth and pulls all the way to 7,000 RPM. Iv'e had many people come up and ask why my new car sounds like a nascar.
I have a 228/228 .590/.590 112lsa and it is great. It has a muscle car idle that shakes the antenna back and forth and pulls all the way to 7,000 RPM. Iv'e had many people come up and ask why my new car sounds like a nascar.
Melting Slicks
Joined: Jun 2002
Posts: 2,246
Likes: 66
From: Middletown CT
[QUOTE=turboc5]Thanks, Is detonation a big problem with the 60cc heads? I wil use the mls head gasket, at least thats are what people are recominding. The car no longer is my dd, just my toy. I don't mind it being a little radical on the street but if I track it I will put some 100 octane fuel in it. As long as I don't advance my timing too much I should be ok with the 60's right? If I go with the 65cc heads wil I lose much power? I wan't to keep the cr as high as I can and still drive it on pump gas, race it on 100. With the asa cam I would think it should blead off a lot of cylinder pressure and make it more pump gas freindly. Thanks for your expert opinion
In the really hot summer weather, I sometimes get a little detonation, so I just blend a few gallons of 100 octane in a tankfull of 93. When it's a little cooler, it's fine on 93.
In the really hot summer weather, I sometimes get a little detonation, so I just blend a few gallons of 100 octane in a tankfull of 93. When it's a little cooler, it's fine on 93.
