LS6 Heads

SMOKEmUP · Posted: Mon Apr 17, 2006 4:34 pm Post subject: LS6 Heads

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.

af2 · Posted: Mon Apr 17, 2006 5:36 pm Post subject: Re: LS6 Heads

87calais · Member Joined: 19 Apr 2003 Posts: 206 5692.14 points

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

SMOKEmUP · Posted: Mon Apr 17, 2006 10:42 pm Post subject:

Paul P · Posted: Tue Apr 18, 2006 1:50 pm Post subject:

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

af2 · Posted: Tue Apr 18, 2006 4:47 pm Post subject:

SMOKEmUP · Posted: Wed Apr 19, 2006 7:55 pm Post subject:

af2 · Posted: Wed Apr 19, 2006 9:23 pm Post subject:

I also looked a Lingenfelter and their numbers are pretty good. I totally screwed up their name but you get my point.Adam

SMOKEmUP · Posted: Mon May 15, 2006 10:34 am Post subject:

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.

87calais · Member Joined: 19 Apr 2003 Posts: 206 5692.14 points

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...

af2 · Posted: Mon May 15, 2006 6:25 pm Post subject:

SMOKEmUP · Posted: Tue May 16, 2006 11:14 am Post subject:

af2 · Posted: Tue May 16, 2006 4:34 pm Post subject:

SMOKEmUP · Posted: Thu Jun 29, 2006 8:01 am Post subject:

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.

87calais · Member Joined: 19 Apr 2003 Posts: 206 5692.14 points

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.