LS6 heads ?

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May 6, 2009 | 09:04 AM

one-72

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LS6 heads ?

casting#3994026 found these for sale locally $ 650.00
triple springs are these the real deal.
Looking to build hot street mill.

May 6, 2009 | 09:48 AM

63mako

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From: Millington Illinois

St. Jude Donor '08-'09

3994026 1971 454 Closed Chamber 425 HP LS-6, 118.0cc
Yes, They are the real deal. Closed chamber heads so piston selection must be made with this in mind. Great price!

May 7, 2009 | 01:37 AM

elle88

Burning Brakes

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Hey,
my books say 103cc chambers...

May 7, 2009 | 04:02 AM

HamadUP

Melting Slicks

Joined: Jan 2003

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From: Doha

St. Jude Donor '08

Yes they are open chamber with 118 cc, I dont think there are any closed chamber heads in 1971 and on, but sure I may be wrong.

May 7, 2009 | 09:29 AM

63mako

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From: Millington Illinois

St. Jude Donor '08-'09

3994025 are listed as open chamber 118 CC
3994026 are listed as closed chamber 118 CC
http://www.teufert.net/bbchevy/bbhead.htm
http://www.nastyz28.com/bbcmenu.php
http://www.chevy-camaro.com/chevy-ca...es.asp?group=6
http://webpages.charter.net/68bowtie/bblock.html

This site doesn't list the 3994025 but lists the 3994026 as open chamber 118 CC.
http://www.mortec.com/bbc.htm
http://www.fastnuf.com/bbccastingnumbers.html

This site lists both as open chamber 118 CC.
http://www.chevellepages.com/numbers...ng_Numbers.htm

I would bet my original post was incorrect and they are open chamber. Sorry for the confusion. Now I am confused as well.

Last edited by 63mako; May 7, 2009 at 09:59 AM.

May 7, 2009 | 09:51 AM

DRIVESHAFT

Drifting

Joined: Aug 2005

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From: League City TX

Quote:

Originally Posted by one-72

.
Looking to build hot street mill.

Unless you are building a really big engine, a hot street mill would be better off with oval port heads if you are using factory castings.

May 7, 2009 | 12:41 PM

jackson

Le Mans Master

Joined: Sep 2001

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From: Unreconstructed, South Carolina

3994026 ... I do not know.

I have speedpro catalog that has a dozen pages of head specs. Dunno if they're right/pretty close/wrong.
It indicates:
3994026 1971 454 103.1cc

My understanding is, like Hamadup, that 1971 up are open. Again, I dunno.

May 7, 2009 | 01:08 PM

early shark

Melting Slicks

Joined: Nov 2004

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From: Nevada City California

They're open chamber design heads.

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May 7, 2009 | 07:55 PM

morganjd

Instructor

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71ls6 vette heads are aluminum open chamber heads with casting number 074 and have 118cc chambers PERIOD!!!, same heads as the 69 L88 cars

May 7, 2009 | 08:41 PM

#10

early shark

Melting Slicks

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From: Nevada City California

Actually the '71 LS6 heads are the same as '69 ZL-1 heads and second design L-88 heads.

May 7, 2009 | 10:03 PM

#11

Ironcross

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From: Taylor Michigan

Quote:

Originally Posted by early shark

Actually the '71 LS6 heads are the same as '69 ZL-1 heads and second design L-88 heads.

except cast iron and probably the 3rd....open chamber, a couple of closed alloy numbers before starting in 66....:

May 7, 2009 | 10:27 PM

#12

wer2xu

Burning Brakes

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From: Boston MA

OK, I thought the Vette LS-6 was an aluminum head, and the chevelles had cast iron heads.

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

3994026....71......rect...OPEN...454 LS6, 118cc chamber

3919842....68-69...rect..CLOSED..396, 427, Aluminum L88, L89, 107cc chamber

May 8, 2009 | 06:07 AM

#13

63mako

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From: Millington Illinois

St. Jude Donor '08-'09

Quote:

Originally Posted by wer2xu

Im leaning toward these being open chamber heads because of the year as are others but these sites list the 3994025 1971 casting as an open chamber and the 3994026 as Closed chamber. Could it be the difference in a production chevelle LS-6 and an OTC Crate LS-6?

Quote:

Originally Posted by 63mako

May 8, 2009 | 10:16 AM

#14

early shark

Melting Slicks

Joined: Nov 2004

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From: Nevada City California

Quote:

Originally Posted by Ironcross

except cast iron and probably the 3rd....open chamber, a couple of closed alloy numbers before starting in 66....:

Not for production cars.

May 8, 2009 | 04:53 PM

#15

wer2xu

Burning Brakes

Joined: May 2008

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From: Boston MA

to answer the original question, they are not heads that came off a 1971 LS6 Corvette.

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