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VORTEC heads .. 12558062 or 10239906

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Old 03-25-2002, 01:55 PM   #1
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Join Date: Jul 1999
Location: Flowery Branch GA USA
Posts: 167

VORTEC heads .. 12558062 or 10239906

hey y'all ...

Which heads are better ..vortecs .. casting #12558062 or 10239906???

here's in the info on the casting numbers ...

10239906...96-up...350.........."Vortec 5700", "L31", 64cc chamber,
170cc intake port, 1.94"/1.5" valves

12558062...98......350..........L31 Vortec, truck, 64cc chambers, 1.94/1.5, 170cc intake port

There used to be "The last word on Vortecs" link here on 3rd gen .. not sure where that went ???
I noticed the 062's don't bring as much money on ebay :\ and
wondered what the deal was !! ... seems like they are a newer
casting number ???


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Old 03-25-2002, 05:32 PM   #2
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Join Date: Jul 1999
Location: Atco, NJ, USA
Posts: 726
Car: 1986 Z28
Engine: 355
Transmission: th400

Now i've been wrong before. but from what i remember the only difference in the two castings is the plant they came from.

I have the 062's, and so does a friend of mine. so I have no real reference to the 906's
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Old 03-25-2002, 06:39 PM   #3
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Join Date: Sep 2001
Location: Ontario, Canada
Posts: 5,839
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction

They are the same. They have identical ports and the same performance potential. You may find the 906's used more on propane and marine /industrial applications. They may or may not
have special valve seat inserts. There is no benefit or disadvantage for your purposes if you do get one of these heads.
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