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Topic Review (Newest First)
05-06-2010 02:51 PM
Custom10 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.
05-05-2010 06:03 PM
Valkyrie5.7
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.
05-05-2010 05:42 PM
cobalt327
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.
05-05-2010 03:44 PM
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:



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.
05-05-2010 03:02 PM
cobalt327
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
03-17-2009 08:23 PM
kc8oye 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
08-14-2008 11:19 AM
DENCOUCH
Whoa!

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

Only a single hump.
08-14-2008 10:55 AM
dallam11 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!
07-27-2008 09:45 AM
F-BIRD'88 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.
07-24-2008 02:13 AM
Xero420 Stfinney,

Your vortec heads are from GM and for 3/4 and 1 ton truck. You have a single ground valve with the harden set installed. GM did this to keep the exhaust valve cooler under heavy load, and pulling that load for a long time. Vortec heads like to crack on the exhaust valve down the runner with out over heating. It was a big issue for GM, and they came up with the install seat to fix the problem.

If you are going to use the vortec heads for a truck to pull heavy loads. Keep the seats, and use the single ground valves. You wont crack the heads, and will get a long life out of them.

If any one can help.
I am trying to find info on the 906's to tell if it came with small ports, or large ports. I have a set of 906 vortec with three angle ground valves. Witch should be the sawtooth heads. But this set of heads don't have the sawtooth on the ends. Nor do it have the bowtie, and GM castings. If any one can lead me to more info, or tell me more about these heads.

I thank you.
05-18-2008 09:25 PM
stfinney Ok, I am not really familiar with center bolt valve covers, so I have a question. I know there is the PCV valve and the oil fill cap, but what is the small hole for? It is about half the size of the PCV valve hole. I am clueless!!
05-18-2008 04:39 PM
stfinney
Vortec Heads

I took out one of the exhaust valves and it looks to have the pressed in seat, but it looks as though it has been cleaned up already. There are no edges at all, it is very smooth all the way to the seat! Yay!
05-18-2008 01:13 PM
stfinney No, haven't done any math for compression yet. Not sure what the pistons are until I take the old heads off. Using a stock thickness head gasket with the new heads. Maybe 9.5 to 10 possibly, not sure. Will check piston to deck height and all when engine is out for repaint and upgrade.
05-18-2008 12:55 PM
curtis73 I have actually used the 062s and 906s on the same engine; one of each. They both had a three-angle valve job, so effectively they are the same head now.
05-18-2008 12:49 PM
Mustangsaly
Quote:
Originally Posted by stfinney
I am using the 624/882 heads right now and can't wait to install the vortecs. I got a new intake and gaskets on the way and a new 260 duration cam for great torque output. It's in a fullsize heavy 1972 truck with a 350 bored .060 with stock gears (later to be 3.73), stock torque converter and 600cfm Edelbrock carb, HEI ignition, 2 1/2" true dual exhaust with turbo mufflers and chrome 3" tips and 1 5/8" headers.


you done any math yet on your compression ? cause your heads on your engine are around 76cc, and the vortecs are around 64cc. witch will up your comppression.
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