vortec cylinder head ?

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RenegadePete379

Doghouse Member
i tried searching but didnt come up exactyl with the info i wanted i was going to goto the junkyard and pull some off there was a set on like a 96 or 97 astro and a s10 with vortec engine to.

what casting numbers are the best to look for when looking for the vortecs, the heads that have the valve covers that say vortec on them.

so fari have 12557107 and 772 are these the vortecs i should be looking for or are there other numbers as well im asking just about vortecs and not l35's

dont know much about these v6's if you guys could throw me some help would be great.
 
ghettosled

ghettosled

SYTY SUPERSTORE
Re: vortec cylinder head ?

There is a post here with all the info. Do a search for vortec casting numbers.
 
T

turboluke

New member
Re: vortec cylinder head ?

I am building a motor right now and I am using a set with the casting # 122557113
 
WyoSyclone

WyoSyclone

Active member
Re: vortec cylinder head ?

Sorry about the delay in posting this info....

10235772's have a bigger intake and exhaust port and no exhaust crossover, .250 inch wide intake mating surface. 5/16 screw in studs. 1996-98 "X" or "W" vin code.

12556140's have a .500 inch wide upper edge intake mating surface, 10mm screw in studs. 1996 - ? Vin ?

12557113's have 10mm screw-in studs. 1998 thru 2003 "W" vin code.

all engine block castings should be '090.

There are two Marine castings.... 12533134, and 12557107 - they supposedly both have thicker castings, with the 107's having hardened valve seats.

Hope this helps.
 
dgoodhue

dgoodhue

BuSTeD 4.3
Re: vortec cylinder head ?

Just look at the intake ports. Vortec's heads don't have a rectangular intake port. One of the vertical port wall isn't parallel with the other. It's obvious. As far as I know all 96 and later 4.3 V6 have this style head.
 
WyoSyclone

WyoSyclone

Active member
Re: vortec cylinder head ?

RenegadePete379 said:
helps out alot are these the only castings or are there others.
Click to expand...

There may be others, but these are the only casting #'s I could find in all GM documentation.

dgoodhue said:
Just look at the intake ports. Vortec's heads don't have a rectangular intake port. One of the vertical port wall isn't parallel with the other. It's obvious. As far as I know all 96 and later 4.3 V6 have this style head.
Click to expand...

Or, just look for four (4) intake manifold bolts.... LB4's and L35's have six.
 
WyoSyclone

WyoSyclone

Active member
Re: vortec cylinder head ?

RenegadePete379 said:
i know that but if the intake manoifold is bolted to the heads you cant see these ports with casting numbers all i have to do is pull off the valve cover when i head to the junkyard instead off pulling the intake.
Click to expand...

If there are 4 vertically oriented bolts holding the manifold to each head, they're Vortecs.
 
R

RenegadePete379

Doghouse Member
Re: vortec cylinder head ?

also they do have the 10mm screw in studs but my question is are the heads tapped for 3/8" in the head so that all i have to do is pull these 10mm rocker studs out and install some arp 7/16" rocker studs?

and do these 6140 heads have the hardened valve guides or seats?
 
WyoSyclone

WyoSyclone

Active member
Re: vortec cylinder head ?

RenegadePete379 said:
also they do have the 10mm screw in studs but my question is are the heads tapped for 3/8" in the head so that all i have to do is pull these 10mm rocker studs out and install some arp 7/16" rocker studs?

and do these 6140 heads have the hardened valve guides or seats?
Click to expand...

They shouldn't have hardened seats - if you post a pic we can tell from that. I'm not sure about the stud question.... just wrench one of them out and check, and post back here so we know.
 
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