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Old 12-01-2012, 10:28 PM
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Vortec heads vs old style

A decent read.I approve of this link:

A Guide to Vortec vs OE Small Block Chevy Heads | OneDirt

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Old 12-01-2012, 10:53 PM
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1Gary,what was the part number (292)? of the G M service cast heads with angle plugs,very popular and cheap in early 80s?
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Old 12-01-2012, 10:55 PM
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The link doesn't speak about adjust the push rod length when cutting down heads or the common machine work Vortec's need,but you guys know about that already.
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Old 12-02-2012, 01:19 AM
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Sorry Vinnie.I don't understand.Thought there was a error in the link and went back to check.I couldn't find it.
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Old 12-02-2012, 01:32 AM
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1Gary,I did not see the heads I used back in the early 80s. GM cast iron,2.02,angle plug heads sold as service heads over the counter.I thought the castings had 292 in there somewhere. thought you might know the casting number?
My 67 Camaro 355 street car ran 11.9s with those heads @ 114 mph. That was decent back then
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Old 12-02-2012, 06:07 AM
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This it Vinnie? >> 340 292
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Old 12-02-2012, 10:54 AM
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those are the heads,thank you.They were really cheap too.crane didnt sell them cheap
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Old 12-02-2012, 11:11 AM
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Well only two types of vortec are any good the 906/l31 and the bowtie aftermarket race only heads.

Humps still make more power once they are ported right. Vortecs can only Get mild port work cause they are so thin. Cut them to thin they will crack.

Difference is only a few puppies in stock form.

Now if were talking about after market race heads that need specail intake you can get high ports or 18degree heads that will blow any stock head away.

Vortec = hype not hp. The fact still remains that all vortec heads need machine work to make power. They do not make 400 hp with stock springs and spring pockets. Unless its on a much larger engine than 350.

Just an fyi to all owners with humps you can make the same port mods that give vortecs power. Just need to angle the ports a little to improve flow around the valves. Spark plug position is not talked about in that article but has a lot to do with the vortec magic. And this cant be easily fixed in the humps. But is not a killer in making power if the engine is tunned right.
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Old 12-02-2012, 04:16 PM
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The vortec heads do work nice on a daily driven vehicle. You could not get the same benefits from a 46x or 601 casting. Even if you tried to copy the modifications on the vortecs. On lifts from .3-400" the vortec are superior. If you were racing you would like to open up the heads a little more. There are some good vortec recipes for a mild driver out there. They are good at flowing while maintaining velocity at lower rpm. Chamber shape , bowl, guide, runner shape, intake entry angle, are good. Nothing bad about the vortecs performance. Sure there are better, but are you going to need that.

My build is with 906 vortecs milled .040" series 2 V6 beehives and retainers. It works very well and cost under $300 for the pair. That includes heads , beehive springs, small retainers, self algining rockers, and all. When the aftermarket can touch that let me know, because any good head at that performance level is over a grand.
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Old 12-02-2012, 08:39 PM
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Quote:
Originally Posted by hcompton View Post
Well only two types of vortec are any good the 906/l31 and the bowtie aftermarket race only heads.
Couple questions:

What's wrong w/using the other production Vortec head, c/n 062?

Why do you think the small and large port Bow Tie Vortec heads are "race only", or did I misunderstand you?
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Old 12-02-2012, 08:54 PM
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Quote:
Originally Posted by cobalt327 View Post
Couple questions:

What's wrong w/using the other production Vortec head, c/n 062?

Why do you think the small and large port Bow Tie Vortec heads are "race only", or did I misunderstand you?
906 and 062 are same head. The bowtie heads are from gm performance group and come as after market heads. They are designed for class racing.

They can be used on the street if you know what your buying.
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Old 12-02-2012, 09:10 PM
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Look like they stop selling the bow ties for the bow tie 2

12480034

They still sell the 906 and the Fuelie heads but dont see the small and large bow ties for sale.
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Old 12-02-2012, 11:36 PM
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Summit, etc. still has the sm/lg port Vortec bow ties.
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Old 12-02-2012, 11:53 PM
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GMpartsdirect still listed them as being available.
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Old 12-03-2012, 01:02 PM
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Quote:
Originally Posted by hcompton View Post
Humps still make more power once they are ported right. Vortecs can only Get mild port work cause they are so thin. Cut them to thin they will crack.
Are you comparing fully ported humps to stock Vortecs? Fully ported the Vortecs will still dominate fully ported humps- and you can't make humps into Vortec heads without extensive welding.
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