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Offline 1981turbotransam

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head id
« on: April 19, 2009, 07:57:57 PM »
i just got a set of heads at charlotte and i need them to be ided for me please. on the sides of the heads they say 6x4 waht are they?
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Offline Gold78Spc

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Re: head id
« Reply #1 on: April 19, 2009, 08:04:56 PM »
Sound like heads off a Pontiac 400.  Don't know the combustion chamber size off hand but could probably look it up for you if you need it.
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Offline 1981turbotransam

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Re: head id
« Reply #2 on: April 19, 2009, 08:10:53 PM »
i think they are the 220 hp heads not positive
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GREATER LOVE HATH NO MAN THAN TO LAY DOWN HIS LIFE FOR A FRIEND
1980 Indy Pace Car Turbo Trans am 301T
1977 Pontiac Trans Am 400 Auto SE Hardtop
looking to buy a 1980-81 Trans Am

Offline Gold78Spc

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Re: head id
« Reply #3 on: April 19, 2009, 08:22:51 PM »
Copied this from this page here.  Its a good source for Pontiac head info.

http://ronspontiacpage.com/reference-pages/stockheadspecs.htm

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78 Gold Special Edition TA
96 GMC Sierra
99 Diamondback 18 Spd
00 Ford Windstar
04 Buick Rendezvous
05 Roadmaster tricycle


Keep on Moppin' in the Free world.

Offline Joker (§ir£Ðragon)

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Re: head id
« Reply #4 on: April 19, 2009, 08:26:10 PM »
Depending on the date code they are either off of a '76 or '77 350 or a '77, '78 or '79 W72 400. They all used the same head.

2.11"/1.66" valves and 94cc combustion chambers

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Larry

Offline 1981turbotransam

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Re: head id
« Reply #5 on: April 19, 2009, 08:31:51 PM »
wahts the hp rateing?
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GREATER LOVE HATH NO MAN THAN TO LAY DOWN HIS LIFE FOR A FRIEND
1980 Indy Pace Car Turbo Trans am 301T
1977 Pontiac Trans Am 400 Auto SE Hardtop
looking to buy a 1980-81 Trans Am

Offline 1981turbotransam

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Re: head id
« Reply #6 on: April 19, 2009, 08:33:31 PM »
i think on the secondary stamp there is an 8
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GREATER LOVE HATH NO MAN THAN TO LAY DOWN HIS LIFE FOR A FRIEND
1980 Indy Pace Car Turbo Trans am 301T
1977 Pontiac Trans Am 400 Auto SE Hardtop
looking to buy a 1980-81 Trans Am

Offline Joker (§ir£Ðragon)

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Re: head id
« Reply #7 on: April 19, 2009, 08:35:50 PM »
Then they're 6X-8 heads. Not 6X-4. Same head with 101cc chambers. Lower compression. They were the ones used on the L78 400s.
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Larry

Offline Joker (§ir£Ðragon)

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Re: head id
« Reply #8 on: April 19, 2009, 08:36:36 PM »
Quote from: 1981turbotransam on April 19, 2009, 08:31:51 PM
wahts the hp rateing?

The heads don't have a HP rating. That all depends on the engine they're bolted to.
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Larry

Offline 1981turbotransam

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Re: head id
« Reply #9 on: April 19, 2009, 08:41:18 PM »
but the casting number says 6x4
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GREATER LOVE HATH NO MAN THAN TO LAY DOWN HIS LIFE FOR A FRIEND
1980 Indy Pace Car Turbo Trans am 301T
1977 Pontiac Trans Am 400 Auto SE Hardtop
looking to buy a 1980-81 Trans Am

Offline Joker (§ir£Ðragon)

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Re: head id
« Reply #10 on: April 19, 2009, 08:48:00 PM »
There's a 4 in the center right next to the 6X? or is it over to the right like in the pic I posted? That large 4 you see in that pic is not part of the casting number. The last digit in either the 6X-4 or 6X-8 ID is the secondary stamp number.
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Larry

Offline 1981turbotransam

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Re: head id
« Reply #11 on: April 19, 2009, 08:50:10 PM »
mine look like the one in the pic
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GREATER LOVE HATH NO MAN THAN TO LAY DOWN HIS LIFE FOR A FRIEND
1980 Indy Pace Car Turbo Trans am 301T
1977 Pontiac Trans Am 400 Auto SE Hardtop
looking to buy a 1980-81 Trans Am

Offline Rick

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Re: head id
« Reply #12 on: April 19, 2009, 11:01:48 PM »
Are you sure you're reading that right?  For giggles and grins, what does the secondary stamp (shown in the pic above) say? ???
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Offline Joker (§ir£Ðragon)

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Re: head id
« Reply #13 on: April 20, 2009, 04:51:56 AM »
Quote from: Rick on April 19, 2009, 11:01:48 PM
Are you sure you're reading that right?  For giggles and grins, what does the secondary stamp (shown in the pic above) say? ???

Quote from: 1981turbotransam on April 19, 2009, 08:33:31 PM
i think on the secondary stamp there is an 8
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Larry

Offline Rick

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Re: head id
« Reply #14 on: April 20, 2009, 11:39:35 AM »
Larry, that's what I thought he said, but then he said they was a 6X4 on the center ports.  I've never seen that, so I'm thinking that the casting numbers are eroded and hard to read and may be some other 3 letter/digit number.  So I'm confused right now as to what he does have, and thought it worth a second look. ???
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