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Old 05-26-2003, 03:53 AM
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Post Chevy 350 Vortec Heads

Could someone please tell me when they started to use vortes heads on the Chevy 350 small block

Will they work on a carberated 1977 vette 350 OK

I would like to know how to id them also

Thanks

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Old 05-26-2003, 04:50 AM
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[quote]Originally posted by graybeard42:
<strong>Could someone please tell me when they started to use vortes heads on the Chevy 350 small block

1996 Models.......

Will they work on a carberated 1977 vette 350 OK

Yes they would be a great UPGRADE over the 77 Vette heads.

I would like to know how to id them also

Thanks </strong><hr></blockquote>

Casting #10239906 are considered by many to be the best. There are others.

http://www.mortec.com/castnum.htm

This site has a complete listing.

I suggest buying a new set. The performance minded Chevrolet dealers sell them brand new.......ready to go.....complete for around $500. Compare this to a used set for $200 or so and then the machine shop bill to do a valve job (and possibly more....guides,springs and surfacing) and it becomes clear....NEW is the way to go.

Be advised that the Vortec heads will require a different intake to match the port layout of the Vortecs.


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Old 05-26-2003, 05:11 AM
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the easiest way to ID them is they only have four bolts (at an angle) holding them to the head intake surface, the intake port is taller and takes a special gasket and intake manifold.

[ May 26, 2003: Message edited by: BOBCRMAN@aol.com ]</p>
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Old 05-26-2003, 06:08 AM
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If you go with the Vortecs, follow the Edelbrock intake recommendations about the intake gaskets, i.e. either the GM stock gasket or a FelPro gasket that I could never find. Other gaskets may have sealing problems.
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Old 05-26-2003, 06:12 AM
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One note about either new or used... The springs that are used on these are very light seat pressure and are for the small roller cam that is used in the Vortec engine... Also the locks and retainers are somewhat light for performance apps... The valves appear to be suitable for performance and have the square cut lock area`s unlike some of the newer rounded ones...
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Old 05-26-2003, 07:24 AM
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They are not that great of a bargain.


Don't get me wrong the L31's flow really well for a factory casting. In fact, I have them on my hot rod, but there are better ways to make more power.

If you already have an intake and you have a cam with good lift, you should get something else.

By the time you have your vortec heads cut for bigger springs and have some screw-in studs installed you could have purchased some TrickFlow 23 degree heads for pretty close to the same amount.

The STOCK trickflows would be aluminum, and would outflow the vortecs. You could run more compression for in the futre if there is a rebuild planned.

Just make sure you think it through. It's not so much of a bargain if you fall in the group I'm talking about.

Then again, if you don't have a high performance intake, and if you run &lt;.465" lift you might be alright purchasing them.

Don't buy too fast.

With all of this said, they would certainly be a great improvement on your vette. The trickflows would even be better, but if you can do the vortecs cheaper-do them. You might want to consider a better cam? If you're running the stock cam, this would be a great time to change it out. You could pick up a comp cams bumpstick for less than $100. You'd just need a few additional gaskets as the intake would be off anyway.

Something to think about...
Ben T.
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Old 05-26-2003, 12:18 PM
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[quote]By the time you have your vortec heads cut for bigger springs and have some screw-in studs installed you could have purchased some TrickFlow 23 degree heads for pretty close to the same amount.<hr></blockquote>

You might consider these K-motion # KMO-K-750 ($130) with their 10 degree locks and retainers all of which are 1.250 diameter which is stock so no spring pocket modds needed... Also to have the pins pulled and machined should cost no more than $100 and a set of ARP rocker studs are only $30 or go with just pinning the studs... (about $50) then with a set of self aligning roller rockers (no need for guide plates) Your ready to run a high lift cam (springs handle up to .610 lift Hyd cam) BTW the chamber design of the Vortec`s allow for more compression (very much like the fast burn alum heads...)

If you do a little research you can save $$$ and have good street HP... But if have plans for alot more HP later then yes the Trick Flows are the better plan...
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Old 05-27-2003, 12:37 AM
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Don't forget the Vortec chamber is much smaller than that of a 77 350. You would need to use a D-cup piston to keep compression ratio down.
<a href="http://www.kb-silvolite.com/page25.htm" target="_blank">http://www.kb-silvolite.com/page25.htm</a> has a chart showing CR with different chamber sizes. 77 350 should be 76cc. Vortec is 62-64cc.
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Old 05-27-2003, 01:34 AM
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Compression would only be like 9:1,which is good for pump gas.77 350s should have dished pistons from the factory.
One thing about the Vortecs,is those damn funky valve covers though.
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