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LS6 Heads
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SMOKEmUP
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PostPosted: Mon Apr 17, 2006 4:34 pm    Post subject: LS6 Heads Reply with quote

I purchased a set of LS6 cylinder heads for my 2002 Z28. I'm going to have them CNC ported by TEA, Total Engine Airflow. Per their website the heads should flow.

Lift ..... Intake ..... Exhaust
.100"..... 64.5....... 47.5
.200"..... 145.2..... 113.6
.300"..... 215.5..... 166.1
.400"..... 254.4..... 222.1
.500"..... 293........ 244.2
.550"..... 306.6..... 252.1
.600"..... 290.1..... 256.3

I was going to do the cam swap then down road heads but I didn't want to upgrade the valve springs on my heads now and then have to pull them for the new heads. So I decided to go for it and get the heads.

I was seriously considering getting a set of the DART heads for the LS1 but the TEA flow numbers looked better. I know flow numbers don't tell the full story and we'll see how they perform.

I'm hoping with the new heads, cam, underdrive pulley, thermostat, ported throttle body, and tuning I can get the car into the 11s (on the stock exhaust). Should be interesting.
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af2
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1933 Willys Coupe

PostPosted: Mon Apr 17, 2006 5:36 pm    Post subject: Re: LS6 Heads Reply with quote

smokemup wrote:
I purchased a set of LS6 cylinder heads for my 2002 Z28. I'm going to have them CNC ported by TEA, Total Engine Airflow. Per their website the heads should flow.

Lift ..... Intake ..... Exhaust
.100"..... 64.5....... 47.5
.200"..... 145.2..... 113.6
.300"..... 215.5..... 166.1
.400"..... 254.4..... 222.1
.500"..... 293........ 244.2
.550"..... 306.6..... 252.1
.600"..... 290.1..... 256.3

I was going to do the cam swap then down road heads but I didn't want to upgrade the valve springs on my heads now and then have to pull them for the new heads. So I decided to go for it and get the heads.

I was seriously considering getting a set of the DART heads for the LS1 but the TEA flow numbers looked better. I know flow numbers don't tell the full story and we'll see how they perform.

I'm hoping with the new heads, cam, underdrive pulley, thermostat, ported throttle body, and tuning I can get the car into the 11s (on the stock exhaust). Should be interesting.


Smoke those are good flow#s. I can see a better cam to make the I/E ratio flat work. Glad you didn't spend the money for Dart or AFR their flow#s are not what TEA has which meens you have to port them. I hate the fact the magazine guys make a big todo about a 6 HP gain. After the heads I would contact a cam company and give them the #s and let them grind a cam for you. Almost every company will do a good job if given flow#'s. Adam


Last edited by af2 on Mon Apr 17, 2006 9:22 pm; edited 1 time in total
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87calais
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PostPosted: Mon Apr 17, 2006 9:14 pm    Post subject: Reply with quote

That'll be nice.... 300 cfm seems to be the magic number with these heads, you gotta love it... Very Happy
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PostPosted: Mon Apr 17, 2006 10:42 pm    Post subject: Reply with quote

87calais wrote:
That'll be nice.... 300 cfm seems to be the magic number with these heads, you gotta love it... Very Happy

I'm tempted to just run the LS6 heads stock to see how they work before I get them ported.
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Paul P
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PostPosted: Tue Apr 18, 2006 1:50 pm    Post subject: Reply with quote

Smoke,
Just port the heads do it once and get it over with.
You will be much happier.
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af2
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PostPosted: Tue Apr 18, 2006 4:47 pm    Post subject: Reply with quote

Paul P wrote:
Smoke,
Just port the heads do it once and get it over with.
You will be much happier.


I totally agree. Once ported then you can add the LS6 intake which has better air flow, Cam, E.T.C. to see the benifits. It seems those heads didn't flow that much more than LS1 heads from the factory. Adam
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PostPosted: Wed Apr 19, 2006 7:55 pm    Post subject: Reply with quote

af2 wrote:
I totally agree. Once ported then you can add the LS6 intake which has better air flow, Cam, E.T.C. to see the benifits. It seems those heads didn't flow that much more than LS1 heads from the factory. Adam

My car came from the factory with the LS6 block and intake. Typical gains from the LS6 heads is about 15-20 HP at the wheels.

I know you guys are right about getting the porting done. So I'll just bite the bullet and get it done.
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af2
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PostPosted: Wed Apr 19, 2006 9:23 pm    Post subject: Reply with quote

I also looked a Lingenfelter and their numbers are pretty good. I totally screwed up their name but you get my point.Adam
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PostPosted: Mon May 15, 2006 10:34 am    Post subject: Reply with quote

It looks like the financial gods are against me. It looks like I'm going to put the heads on as is.

When I do the swap I'll be adding the following components.
Underdrive pulley
Camshaft - 221/221 @ 0.05 0.551/0.551 w/ 114 lsa.
Stock LS6 heads Sad
0.045" head gasket, stock is 0.054". This should give SCR=10.89:1, DCR=8.495:1
160 thermostat.
Ported throttle body.

I'm guessing the car is making about 300 HP to the wheels now. I'm hoping with the above upgrades I can make about 360 HP to wheels which should be close to the 11's.
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87calais
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PostPosted: Mon May 15, 2006 6:18 pm    Post subject: Reply with quote

Smoke, you already have the head gaskets? if not.. fel pro makes some real nice .041" ones... and I think .039... Not much tighter, but, figured I'd at least mention them...
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af2
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1933 Willys Coupe

PostPosted: Mon May 15, 2006 6:25 pm    Post subject: Reply with quote

smokemup wrote:
af2 wrote:
I totally agree. Once ported then you can add the LS6 intake which has better air flow, Cam, E.T.C. to see the benifits. It seems those heads didn't flow that much more than LS1 heads from the factory. Adam

My car came from the factory with the LS6 block and intake. Typical gains from the LS6 heads is about 15-20 HP at the wheels.

I know you guys are right about getting the porting done. So I'll just bite the bullet and get it done.

Rolling Eyes
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PostPosted: Tue May 16, 2006 11:14 am    Post subject: Reply with quote

af2 wrote:

Rolling Eyes

I wish I could afford to have them ported but right now I can't. Therefore I want to put them on and enjoy them.
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af2
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PostPosted: Tue May 16, 2006 4:34 pm    Post subject: Reply with quote

smokemup wrote:
af2 wrote:

Rolling Eyes

I wish I could afford to have them ported but right now I can't. Therefore I want to put them on and enjoy them.


Just giving you a bad time Smoke. I know how it is with the $$$ thats why my car hasn't left the garage yet. But it will!!!
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PostPosted: Thu Jun 29, 2006 8:01 am    Post subject: Reply with quote

I decided to pony up and pay for the heads to get ported by TEA. The heads are done and in route back to me. I don't have the complete flow sheet just yet but Mike @ TEA said they flowed 319 cfm on the intake, I don't know at what valve lift. I'll post the flow sheet once I get the heads ( hopefully by end of this week or beginning of next).

The car will be down for a bit while doing the heads because I'm unsure of the pushrod length due to a thinner head gasket, milling the heads, and the LS6 valves are 0.6mm taller. I'll have to put the motor together and then measure / order the correct pushrod length.

I'm hoping for some good gains. I'll keep everyone posted.
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87calais
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PostPosted: Thu Jun 29, 2006 8:36 am    Post subject: Reply with quote

SHIIIITTTT, 319cfm... that ain't to shabby at all, should be quite a gain... that's what, 70 cfm more then stock?.... I think you'll be rocking it out for sure.
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