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LS6 Heads
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artinla
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Joined: 09 May 2006
Posts: 233

8558.30 points


1971 Chevrolet Nova

PostPosted: Thu Jun 29, 2006 8:40 am    Post subject: Reply with quote

Very nice numbers on those heads. You will probably have to consider a cam change, but with that you should be easily into the 11's. No reason why you can't put 420+ to the wheels with those heads.

Can't wait to hear what it runs.

Art
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87calais
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Posts: 206

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PostPosted: Thu Jun 29, 2006 12:15 pm    Post subject: Reply with quote

Now that I'm awake... Smoke, what stage did you get done, because I was staring at there page, and I noticed that they do have a stage that is supposed to flow right around 320... is that the one you ordered? or did you get the stage below it, and somehow got real lucky and had heads that flowed phenomonally?
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88 SS Monte Carlo, nowhere near stock
'04 Silverado =)
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SMOKEmUP
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Joined: 30 May 2002
Posts: 3169

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1979 Chevrolet Camaro

PostPosted: Thu Jun 29, 2006 12:31 pm    Post subject: Reply with quote

87calais wrote:
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.

Yes. It should make a big difference. Seeing numbers like that make me want to buy a FAST intake and 90 mm TB, but that's money I don't have.


artinla wrote:
Very nice numbers on those heads. You will probably have to consider a cam change, but with that you should be easily into the 11's. No reason why you can't put 420+ to the wheels with those heads.

Can't wait to hear what it runs.

Art

When swapping the heads I'll also be changing the stock cam to an MTI B1 cam. Specs are 221/221 @0.05 0.551"/0.551" 114 LSA.
Other changes will be a bump in compression, from 10.25:1 to 11.1:1, underdrive pulley, 160 T-stat.

The car will retain the stock exhaust down to the manifolds (for now anyway). I have an electric cut-out I plan to add in the I-pipe.

The car is an automatic so I doubt 420 RWHP. I'm hoping the car will put down 360 - 380 range, which should be good enough for 11's. Previous best with great weather is 12.6 @ 107 mph, DA -800 ft or so.

The goal is for a stealth normally aspirated, no nitrous, true 11 second daily driver. I want it to idle good and be nice and quiet, plus get resonable gas mileage ( I average between 18 - 22 now). I don't want people to give it a second glance until it rips off some 11 second passes.


Last edited by SMOKEmUP on Thu Jun 29, 2006 1:35 pm; edited 1 time in total
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SMOKEmUP
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Joined: 30 May 2002
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1979 Chevrolet Camaro

PostPosted: Thu Jun 29, 2006 12:34 pm    Post subject: Reply with quote

87calais wrote:
Now that I'm awake... Smoke, what stage did you get done, because I was staring at there page, and I noticed that they do have a stage that is supposed to flow right around 320... is that the one you ordered? or did you get the stage below it, and somehow got real lucky and had heads that flowed phenomonally?

I ordered stage 1. The heads are new 243 castings with LS6 hollow stem sodium filled valves, and comp 918 springs.

I had the 918s, Ti retainers, and valve seals already ( for the cam swap). The heads and valves came on ebay for a deal I couldn't pass up. So I decided to go for it.
Total for everything worked out to about $1,000 cheaper than AFR or ET heads.
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87calais
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PostPosted: Thu Jun 29, 2006 1:15 pm    Post subject: Reply with quote

Then you got lucky if they flow 319, cuz there stage ones are only charted at 300 cfm, Cheers You're going to have one hell of a Ride when that's all done.
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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Thu Jun 29, 2006 1:33 pm    Post subject: Reply with quote

I'm waiting to see the flow sheet. Since the lift on the cam is only 0.550 I don't care about lift above 0.550" right now. I hope the low lift flow numbers are better as well. I'd rather have better flow area under the curve than peak flow numbers.
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artinla
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1971 Chevrolet Nova

PostPosted: Thu Jun 29, 2006 8:00 pm    Post subject: Reply with quote

I missed the part where you said you would retain the stock manifolds. You are right about not getting 420, but your goals are easily within reach.

Nothing I love more than cars like yours.. Daily driver sleepers that can tote the mail!
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af2
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Thu Jun 29, 2006 9:19 pm    Post subject: Reply with quote

Always wondered why they flow heads at .700 and above. The real world is .600 or lower. You hardly see that! I always look at heads flowed at .500 too see and compare.
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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Fri Jun 30, 2006 10:47 am    Post subject: Reply with quote

Have the heads in my hand.

Flow numbers

Lift ..... Intake ..... Exhaust
.100"..... 66.6....... 50.5
.200"..... 137.7..... 116.8
.300"..... 215.1..... 165.6
.400"..... 258.3..... 226.3
.500"..... 300.1........ 246.2
.550"..... 312.0..... 251.4
.600"..... 320.2..... 256.6

Big Grin Big Grin Big Grin Big Grin Big Grin
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SMOKEmUP
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Joined: 30 May 2002
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1979 Chevrolet Camaro

PostPosted: Fri Jun 30, 2006 11:27 am    Post subject: Reply with quote

Comparing flow numbers to other flow numbers on different flow benches isn't a good comparison. So in doing some searching I found flow numbers of the new AFR LS1 cylinder heads flowed on the same bench. A much better comparison. All flow numers are on a 3.9" bore.

Lift............AFR 205...........AFR 225...........My TEA's
.100............64...................68........... ......66.6
.200............140.................149........... ......137.7
.300............203.................220........... ......215.1
.400............250.................269........... ......258.3
.500............282.................306........... ......300.1
.550............296.................315........... ......312.0
.600............303.................305........... ......320.2
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nwcc
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PostPosted: Fri Jun 30, 2006 2:25 pm    Post subject: Reply with quote

smokemup wrote:
Comparing flow numbers to other flow numbers on different flow benches isn't a good comparison. So in doing some searching I found flow numbers of the new AFR LS1 cylinder heads flowed on the same bench. A much better comparison. All flow numers are on a 3.9" bore.

Lift............AFR 205...........AFR 225...........My TEA's
.100............64...................68........... ......66.6
.200............140.................149........... ......137.7
.300............203.................220........... ......215.1
.400............250.................269........... ......258.3
.500............282.................306........... ......300.1
.550............296.................315........... ......312.0
.600............303.................305........... ......320.2


thats a big jump from the stock LS-1

CHP has the LS-1 heads flowing
.100.....83/62
.200....134/104
.300....189/136
.400....222/165
.500....240/179
.600....252/185

I wish I had an LS engine.
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SMOKEmUP
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Joined: 30 May 2002
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1979 Chevrolet Camaro

PostPosted: Fri Jun 30, 2006 2:28 pm    Post subject: Reply with quote

wow. The TEA exhaust port outflows the stock LS1's intake from 0.400 on up.
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87calais
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PostPosted: Fri Jun 30, 2006 3:23 pm    Post subject: Reply with quote

Wow, now I Impulsively wanna spend $1500... This is bad... but that looks good....
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zo6vetteman2003
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Joined: 03 Nov 2006
Posts: 14
Location: Middleboro, Ma.
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PostPosted: Mon Nov 13, 2006 7:21 am    Post subject: Reply with quote

smokemup wrote:
I ordered stage 1. The heads are new 243 castings with LS6 hollow stem sodium filled valves, and comp 918 springs.

This is exactly what I am running. The lighter the better as you know. I also run the Crane Gold Race 1.8 roller rockers. They provide .035" additional lift.

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03' Corvette ZO6, Vararam Widemouth intake, Carbon Fiber Powerduct, LSX FAST 90 Intake and Ported and Polished LS2 90mm throttlebody, 36# Fuel injectors, Kooks 1-7/8" LT's 3" X pipe, Borla Stingers, Comp Cam XR281HR (228/230 Dura.) 112 degree lsa. Stage 1 215cc/80cc 62cc combustion chamber LS6 heads ported and polished to Stage 2. Crane 1.8 Gold Race Rockers. Nitto 555RII's, SPEC Stage 3+ clutch.
Tuning by Slowhawk DEZ Racing Seekonk, Ma.
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