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  #16 (permalink)  
Old 07-27-2008, 09:45 AM
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The 062's have a saw tooth end identifier. I've worked with a lot of them and never had one crack on me, stock, ported, 2.02's etc. Always started with new unabused head castings thou. Your heads are later than the saw tooth series 062 vortecs.
Post a close up pic of the valve spring side of the head to see other GM cast marks, identifiers etc . A production date code should be stamped on the machined exhaust mating flange.
Those could be an aftermarket replacement also. If you wnat to know the port volume fill it up with water and measure should be 170-171cc.
I hear the recent Heco en Mexico vortecs have smaller port volume and don;t breath as good.
GM used to cast to good ones here in St. Catharines Ont.

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  #17 (permalink)  
Old 08-14-2008, 10:55 AM
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Did you ever find out the reason for not having the "sawtooth" end id on your vortec's? I just bought a used set of Vortec's today for 200 bucks. Everything checks out fine with the exception of the end marks which have a one hump only end identifier, like yours!
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  #18 (permalink)  
Old 08-14-2008, 11:19 AM
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Whoa!

I checked my 902's & I don't have the sawtooth either!

Only a single hump.
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  #19 (permalink)  
Old 03-17-2009, 08:23 PM
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I don't mean to hijack this thread.. but this thread seems like a good place to tack on my question

I was given a set of 906 vortec's today.. and was told one of them IS cracked, however, the guy's own machine shop said they're ok to run with the crack as it is in a non-critical location.. has anyone heard of such a thing with vortecs? I dont' know what they belong to if anything. if I get a few minutes tomorrow I'm going to give them a bath in the parts washer and take a good look at them, and get the casting #'s and all that good stuff.. I did look close enough to see the last 3 digits were 906
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  #20 (permalink)  
Old 05-05-2010, 03:02 PM
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Quote:
Originally Posted by DENCOUCH
I checked my 902's & I don't have the sawtooth either!

Only a single hump.
Bump this mother. 902 castings? Vortec heads are 062 w/sawtooth OR 906 w/single hump identifier.
Either are "good".


062 HEAD


906 HEAD

Last edited by cobalt327; 05-05-2010 at 06:08 PM.
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Old 05-05-2010, 03:44 PM
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EDIT: Old post... ugh.

I can tell you by the chambers alone that those aren't vortec heads. This is what a vortec chamber should look like:



It has a distinct "heart" shape to it that is exclusive to the 062 and 906 castings. I can't tell what heads those are from your pictures but the full head casting number should be in the rocker area. Judging by those huge chambers, they look like smoggers to me.

Last edited by Valkyrie5.7; 05-05-2010 at 03:50 PM.
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Old 05-05-2010, 05:42 PM
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Quote:
Originally Posted by Valkyrie5.7
EDIT: Old post... ugh.

I can tell you by the chambers alone that those aren't vortec heads. This is what a vortec chamber should look like...
What heads are you referring to? All the heads shown in this thread are L31-type Vortec.
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  #23 (permalink)  
Old 05-05-2010, 06:03 PM
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Quote:
Originally Posted by cobalt327
What heads are you referring to? All the heads shown in this thread are L31-type Vortec.
Post #15 attachment 2. I guess I should open up the pictures before posting. The way the dark deposits were left on the chambered shape made it seem deeper than it was. Thanks for the catch.
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  #24 (permalink)  
Old 05-06-2010, 02:51 PM
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Those could be an aftermarket replacement also. If you wnat to know the port volume fill it up with water and measure should be 170-171cc.
I hear the recent Heco en Mexico vortecs have smaller port volume and don;t breath as good.
GM used to cast to good ones here in St. Catharines Ont.[/QUOTE]

Just my 2 cents. I have just recently cc'd my made in mexico 062 vortecs that are the ones summit sells. They are 67 cc chamber volume and were 170cc on the intake runner volume so not all mexico vortecs are smaller...best to check for yourself.
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