Are These 96+ Vortec Heads ??
#1
02-02-2010, 11:07 AM
Are These 96+ Vortec Heads ??
Are the heads on this engine the 96+ High flow heads that are mounted on this block ?
http://www.katmanduonline.net/parts/Blazer/100_1663.JPG
What are other ways to tell the differences between 96+ Heads and the earlier 95 and down heads ??
I've heard the casting # on 96+ heads is "772". Where is it located ?
Are there other ID #s ?
http://www.katmanduonline.net/parts/Blazer/100_1663.JPG
What are other ways to tell the differences between 96+ Heads and the earlier 95 and down heads ??
I've heard the casting # on 96+ heads is "772". Where is it located ?
Are there other ID #s ?
Last edited by Katmandu; 02-02-2010 at 12:19 PM.
#2
02-02-2010, 12:45 PM
Judging by the valve covers, they would appear to be (
), but the real tell tale is the orientation of the intake bolts. On the 96+, the bolts are plumb vertical while on the pre-96, they are perpendicular to the gasket surface.
And get the "vortec" / "non-vortec" out of your head. All GM 4.3L v6 engines produced to date have the vortec cylinder head design. There are differences along the way and to further confuse that fact, GM didn't start using the "Vortec" name on this engine until the 92 release of the CPI motor.
As far as block/head casting codes, the head casting codes will be under the valve cover. The block will have identification numbers down the side. I have seen them, but I have never had a reason to track down what they mean. I'd imagine the information is out on the net somewhere.
And was another thread on your hunt for a motor really necessary??
), but the real tell tale is the orientation of the intake bolts. On the 96+, the bolts are plumb vertical while on the pre-96, they are perpendicular to the gasket surface.And get the "vortec" / "non-vortec" out of your head. All GM 4.3L v6 engines produced to date have the vortec cylinder head design. There are differences along the way and to further confuse that fact, GM didn't start using the "Vortec" name on this engine until the 92 release of the CPI motor.
As far as block/head casting codes, the head casting codes will be under the valve cover. The block will have identification numbers down the side. I have seen them, but I have never had a reason to track down what they mean. I'd imagine the information is out on the net somewhere.
And was another thread on your hunt for a motor really necessary??
#3
02-02-2010, 01:46 PM
This thread isn't about looking for another engine. It's about trying to identify which heads are on the block.
The guy selling this engine has a 94 Blazer and can't use this engine. I'm just trying to be 100% POSITIVE that he didn't put his 94 heads on this 2006 block.
I don't feel like getting taken for $500.
Thank you for your help.
Last edited by Katmandu; 02-02-2010 at 01:49 PM.
#4
02-02-2010, 01:51 PM
So you can see if it will go into your truck... Its one big circle that keeps coming back to the fact that you are looking for a motor for your truck.
It is just cleaner to keep it all in one thread.
It is just cleaner to keep it all in one thread.
#5
02-02-2010, 02:04 PM
I've already determined the block will work out. It's the heads on the block that is the issue here.
I'm sure other member's would find this information informative as well.
I'm simply trying NOT to get ripped off by $500. Nothing more nothing less.
Sorry to clutter up the forum.....
I'm sure other member's would find this information informative as well.
I'm simply trying NOT to get ripped off by $500. Nothing more nothing less.
Sorry to clutter up the forum.....
#6
02-02-2010, 05:58 PM
After doing more research it's determined these are 92-93 vintage.
Resourced via...
http://www.enginebuildermag.com/Arti...chevy_262.aspx
Hope this helps someone out BEFORE they get burned (like I almost did.)!
Resourced via...
http://www.enginebuildermag.com/Arti...chevy_262.aspx
Hope this helps someone out BEFORE they get burned (like I almost did.)!
1992-’93 TRUCK WITH CFI, BALANCE SHAFT:
When the high output VIN "W" engine with central fuel injection was introduced in ’92, the heads were redesigned for the application.
They have "eyebrows" added to the top of the intake ports to make room for the injector nozzles, so the intake surface above the ports was increased by 0.250˝ for improved sealing, and the cast ledge above it was narrowed down to 0.350˝ to provide more room for the intake manifold.
The 10077626, 14099064, 10240209 or 10238181 castings were used, but be sure to check them over carefully because there are two versions of the 10238181 and 10240209 castings with an important difference.
In ’92 and ’93, they came with an 8° top angle on the intake seat and a 75° throat, but that was changed to a 30° top angle with an 80° throat in ’94. Separate the 8° heads from the 30° heads and use them only on the ’92 and ’93 engines.
Tonawanda switched to "net lash" rockers in ’92, so some of these are adjustable and some aren’t.
1993 TRUCK WITH TBI, EXCEPT HEAVY DUTY: The intake manifold on the TBI motor was modified in ’93 to take advantage of the wider intake surface that was machined on the ’92 and up heads, so these engines must have the heads with the wide intake and should use the castings with the 8° top angle on the intake seat.
1994-’95 TRUCK WITH TBI OR CFI, EXCEPT HEAVY DUTY: The top angle for the intake seat was changed from 8° to 30° and the throat was opened up from 75° to 80° to give a 10% increase in intake airflow for better performance in ’94. The same heads were used on both the TBI and CFI engines through ’95.
Both the 10238181 and 10240209 castings were used, but they have to be visually sorted because the early ones with the 8° seat probably shouldn’t be used on the ’94s and ’95s. If you do decide to stretch the rules and use the ’93 heads on a ’94-’95 engine, be sure to use them in pairs. Some of the ’94s still had adjustable rockers because Romulus didn’t switch over to "net lash" until ’95.
1996+ ALL TRUCKS EXCEPT HEAVY DUTY:
There was another all new head introduced in ’96.
It had bigger intake and exhaust ports, no exhaust crossover and four angled bolts for the intake.
It’s the 10235772 casting.
When the high output VIN "W" engine with central fuel injection was introduced in ’92, the heads were redesigned for the application.
They have "eyebrows" added to the top of the intake ports to make room for the injector nozzles, so the intake surface above the ports was increased by 0.250˝ for improved sealing, and the cast ledge above it was narrowed down to 0.350˝ to provide more room for the intake manifold.
The 10077626, 14099064, 10240209 or 10238181 castings were used, but be sure to check them over carefully because there are two versions of the 10238181 and 10240209 castings with an important difference.
In ’92 and ’93, they came with an 8° top angle on the intake seat and a 75° throat, but that was changed to a 30° top angle with an 80° throat in ’94. Separate the 8° heads from the 30° heads and use them only on the ’92 and ’93 engines.
Tonawanda switched to "net lash" rockers in ’92, so some of these are adjustable and some aren’t.
1993 TRUCK WITH TBI, EXCEPT HEAVY DUTY: The intake manifold on the TBI motor was modified in ’93 to take advantage of the wider intake surface that was machined on the ’92 and up heads, so these engines must have the heads with the wide intake and should use the castings with the 8° top angle on the intake seat.
1994-’95 TRUCK WITH TBI OR CFI, EXCEPT HEAVY DUTY: The top angle for the intake seat was changed from 8° to 30° and the throat was opened up from 75° to 80° to give a 10% increase in intake airflow for better performance in ’94. The same heads were used on both the TBI and CFI engines through ’95.
Both the 10238181 and 10240209 castings were used, but they have to be visually sorted because the early ones with the 8° seat probably shouldn’t be used on the ’94s and ’95s. If you do decide to stretch the rules and use the ’93 heads on a ’94-’95 engine, be sure to use them in pairs. Some of the ’94s still had adjustable rockers because Romulus didn’t switch over to "net lash" until ’95.
1996+ ALL TRUCKS EXCEPT HEAVY DUTY:
There was another all new head introduced in ’96.
It had bigger intake and exhaust ports, no exhaust crossover and four angled bolts for the intake.
It’s the 10235772 casting.
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