I have a set of '71 year model LS6 heads pn#3994026. they have been port/polished & milled dont know all the specific flow #'s. they are bare but in great shape. what would you guys say the are worth? Im thinking about trying to sell them for a set of heads to go on my Camaro. these heads were originaly going to be for my '69 Nova SS. i was building a 535Ci stroker, but now i may have to sell the car. I dont have a place to keep it any more

I've seen a couple sets on ebay go for around $1200 there were also bare one set was rusty.

Oh well, maybe i'll just keep them for a future project. its just been on my mine for the last few days.

-Stuart

 

(Drooling)

 

LS6 wasnt offered in 71 I believe only the LS5.

 

Actually it was, before you come in here and try to make me look stupid do a search on google.com for "ls6 3994026" and see what you get. heres just one of the sites i found.

this is off of: http://www.stingray.nu/temp/heads.htm

Casting # Chamber Years CID & Additional Comments
3804391 Closed 65 396 - 375 and 425HP
3856208 Closed 65-67 396/425hp, 109cc chamber 396/375hp "Z-16" Chevelle
3873858 Closed 65-66 396 & 427 Hi Perf, 109cc chamber
3904391 Closed 65-67 396 & 427 Hi Perf, 107cc chamber
3904392 Closed 67 Aluminum 427 - 430 & 435 HP, 107cc chamber
3919328 Closed 67 Aluminum 427 - 425 & 435 HP
3919391 Closed 66 427 - 425 HP
3919838 Closed 67-69 Aluminum 427 L-88 & L-89
3919839 Closed 67-69 396 & 427 Hi Perf
3919840 Closed 65-69 396 & 427 Hi Perf, 107cc chamber
3919842 Closed 67-69 396 & 427 Aluminum L-88, 107cc chamber
3931068 Closed 66-69 427 Hi Perf
3946074 Open 69-71 69 427 L88, ZL1, Aluminum, 118cc chamber '71 454 LS6, "round exhaust port"
3964291 Closed 69-70 396, 402, 427, 454, 109cc chamber Large or small hex spark plugs used
3964292 Closed 70 454 - 450 HP
3994025 Open 71 454
3994026 Open 71 454 LS-6 - 425 HP, 118cc chamber
3996074 Open 71 454
6258723 Open 71 454 - 425 HP
6272990 Open 70-76 454 service replacement, used on some MKIV crate engines, 118cc chamber
10045427 Open 90- Pontiac/Chevy Aluminum, 91cc chamber Large Port, race
10049875 Open 90- Pontiac/Chevy Aluminum Small port, race
10051128 Open 88 Bowtie, Aluminum 72cc chambers Symmetrical ports
10051129 Open 88 Bowtie, Aluminum "raw" casting, Symmetrical port
12363401 Open 96- Bowtie, Aluminum, Signature Series, fits MKIV, Gen.V, Gen.VI, 118cc chamber
12363861 Open 96- Signatures Series, 2ND Design, Raised Port, Aluminum
12562934 Open 00- Gen.VI 502 Marine
14011077 Open 69-71 Aluminum, fits MKIV, "C-port" 118cc chamber, also sold as a "solid" head
14011077 Open 69-71 427 & 454 Solid
14044861 Open 84-96 Bowtie, Aluminum, MkIV, "raised runners", 1st design, 105cc chamber
14044861 96- Bowtie, Aluminum, Signature Series, fits MKIV, Gen.V, Gen.VI "raised runners", 2nd design, 115cc chamber
14044861 84-96 Bowtie, Aluminum, MkIV "raw" casting of "861" MKIV 1st design
14044862 84 Aluminum Bowtie Raised Ports, 1ST Design
14096188 Open 70-71 54 service replacement, also used on later Mark IV LS-6, LS-7 and 454 HO crate motors, 116cc chamber
14097088 Open 91- 454HO & 502HO Gen V, , 118cc chamber
24502585 97 Olds/Chevy, DRCE 2, Pro Stock aluminum, for blocks w/4.900" bore centers

Im not for sure what the motor was offered in but they did make the LS6 in '71

Thanks

 

did another search, the LS6 was the 425hp option for the '71 vettes the LS5 was the 390hp option you could also get the 330hp LT1. there were only 188 sold with the LS6 RPO so i guess you could say there rare.

Heres some what of a right up. http://www.illustratedcorvetteseries...rod_Vette.html

heres were i found the build #'s http://rowleycorvette.com/stats71.html

 

Not trying to make you look stupid but I had never heard of a 71 LS6. Thats why I said "I believe"

 

thats cool, when i read your post at 3.30am it kinda pissed me off. i guess i could have worded that differantly.
I see where your comin from with only 188 made im sure hardly anybodies ever heard of them.

but with yoou being a sponser people listen to you, with you sayin they DIDNT make a 71 LS6. it makes me look like im trying to **** someone or like i dont know what im talkin about. either way who would want my heads after reading that.

-Stuart

 

get some flow #s on them you will get more money for them

 

Your right, but im not sure that anybody in town has a flow bench so i would have to take them out of town to get done. i just havnt had much time.

thanks,

Stuart

 

when u ready to sell them shoot me a pm .....im mite go with a dart head come summer time and a roller cam setup... im runing the iron ls7 heads now on my bbc got them for 1200$ just redone with spings good till 750lift

 

LS6 never came in vettes man. Sorry to burst your bubble. The LS6 actually was listed in the vette handout and was rated at 460HP, but none ever made that we know of. There are some rumors that a few LS6 vettes left the factory.

 

If you look at the MorTec casting site....
http://www.mortec.com/bbc.htm
They advertise 3994026....71......rect...OPEN...454 LS6, 118cc chamber
Yet other books say 4291 LS6 for 1970

3946074....69&71...rect...OPEN...'69 427 L88, ZL1, Aluminum, 118cc chamber
'71 454 LS6, "round exhaust port"

Not hard to get mislead let alone go ballistic on someone who might not know. With all the very different info out there we help each other be better informed. Hey try this, well if you look at this site you'll find that they did produce this and here is the info. Try to remain civil and not look stupid going off the deep end when you know your right. Just my two cents and I get to spend them where I'd like.

 

holy 4 year old thread batman. J/Kin Thanks for reaffirming that they do exists. I still have them sitting on the shelf collecting rarity.

I also ended up being able to keep the car, I just finished tubbing it

 

Didn't look at the date was just searching for info and stumbled across this one. Nice job on the tubbing it looks great. I have the 4291 heads and I don't believe they will work on the roller assembly on the 1990 454 I found Looks like a really nice ride.

 

Its still a huge work in progress, the front clip is off and I haven't done the tin work to replace the floor boards/trunk area yet.

as for the 291 heads on the 1990 454 block , I have about the same combo sitting in the car now(#820 HEADS on a #14015445 BLOCK, pulled from a '90 dully). Im not running roller on it yet, its just a cheap hyd flat tappet setup I threw together for mock up & so i could pull the car in and out of the shop. Im not sure what parts that block you found has but You should be able to make a roller setup work with those heads.

 

Its a 90 SS engine so peanut port heads and low compression.7.9-8.3 if its that high. So I think I will try this idea for now.

http://www.ststurbo.com/the_technology

Should be ok on the low compression setup the engine has low Km 60000 range.

 

The STS kits are a pretty cool deal, Why not pull the crappy peanut ports off, throw them away then bolt your rect ports on. the turbo kit will no doubt be awesome but those crappy heads are going to be choking off a lot of potential power. just a thought

 

Well will the heads work ok with the roller cam and I guess all I'd need to do is change the tbi intake to work with the older heads. I never mind the advice or suggestions. Thanks

 

Well I was out in the garage the other day and realized I still have these. The car now has an LSX stroker and trickflow 235's so I have no need for these BBC Heads.

Make me an offer, I just want them gone to someone who can actually use them.