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  #31 (permalink)  
Old 02-07-2013, 07:56 PM
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this has 461 heads seem to work good for me.
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  #32 (permalink)  
Old 02-07-2013, 07:59 PM
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Originally Posted by 496CHEVY3100 View Post
this has 461 heads seem to work good for me.
Nice car!
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  #33 (permalink)  
Old 02-07-2013, 08:13 PM
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Originally Posted by prostreet6t9 View Post
You could get the power steering bracket that bolts to the front header bolt. Then get ya a low mount for your alternator mount that bolts to the lower bolt holes on the block and the problem is solved.
Brackets still avalible a chevy parts dept.and also Summitt.try to stay away from Chrome from Summitt.
Thanks prostreet 6t9.
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  #34 (permalink)  
Old 02-08-2013, 06:32 AM
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Originally Posted by cobalt327 View Post
I had thought the whole "only one good Vortec head" bs had been laid to rest a LONG time ago. For those who don't know, some wag at CHP magazine (IIRC) started this myth shortly after the Vortec heads came out (and before much was actually known about them, presumably). This myth has been rebuked many times by dyno and flow bench tests, track testing, etc. etc. but still surfaces every so often.

Here are the FACTS: The ONLY significant difference in c/n 906 and 062 L31 production Vortec heads is the 906 head MIGHT have a hardened exhaust seat insert as opposed to an induction hardened seat. The insert MAY cause there to be a slight lip where the insert and head meet. And there might be a single angle seat instead of the three angle seat used on the induction hardened seats (this has to be verified). These differences certainly do NOT make the 906 w/insert a "bad" or "poor flowing" head. In fact, there are boat builders who prefer the insert seat heads.

If the Vortec head as used on production vehicles has a problem, it's cracking- NOT flow. Some cracking isn't because of the heads per se; they cracked because of other shortcomings of the engine.

IMO anyone who cannot get better performance from a Vortec head than a fuelie head- all else being equal- needs to work on their engine building skills.

Vortec heads
The 031 and the 906 are pretty much the same head and it is also the only vortech head that will out perform the 461. So yeah only one good vortech head. All the others are just as average as many of the regular casting heads. Some are much worse!

The humps can be ported out much bigger than the vortech can. So yes they can out perform them. With the 461 heads you can also reangle the ports a little to allow for better flow. This is one mod that does not need to be done on the vortechs. vortech already benifit from a better angle. With ports you have volume and angle if you have the best then your engine will flow. No magic or secret spells.

Small exhuast ports can be helped with a split pattern cam but when going for borke you may already be using the max exhuast duration or you may not want to use a bad cam to make up for the heads short comings.

I would be interested to see dyno results of stock cast vortech heads pulling more than 350 hp n/a and not using the 031 or 906 or any other gm performance products heads.

Both heads will make an easy 350 hp and both have been used to make 400 hp many times over.
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  #35 (permalink)  
Old 02-08-2013, 06:40 AM
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Originally Posted by BOBCRMAN@aol.com View Post
The X does not denote a larger intake runner. That is a popular wives tale. The X only means there was a change (in the mold) from original casting design. This could be most anything. From xtra thickness in a mounting boss/spring pocket to coolant passage mods.
461 x are bigger intake runners

Small Block Chevy Cylinder Heads

No wives tale i have measured it in several sets.
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  #36 (permalink)  
Old 02-08-2013, 08:00 AM
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Originally Posted by hcompton View Post
The 031 and the 906 are pretty much the same head and it is also the only vortech head that will out perform the 461. So yeah only one good vortech head. All the others are just as average as many of the regular casting heads. Some are much worse!

The humps can be ported out much bigger than the vortech can. So yes they can out perform them. With the 461 heads you can also reangle the ports a little to allow for better flow. This is one mod that does not need to be done on the vortechs. vortech already benifit from a better angle. With ports you have volume and angle if you have the best then your engine will flow. No magic or secret spells.

Small exhuast ports can be helped with a split pattern cam but when going for borke you may already be using the max exhuast duration or you may not want to use a bad cam to make up for the heads short comings.

I would be interested to see dyno results of stock cast vortech heads pulling more than 350 hp n/a and not using the 031 or 906 or any other gm performance products heads.

Both heads will make an easy 350 hp and both have been used to make 400 hp many times over.

the 061 and 906 casting are the only 2 vortec casting numbers used for production vehicles...

So there are only 2 possibilities and they both go well over 400hp on most common hot street builds- it kinda makes the rest of your post irrelevant.
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  #37 (permalink)  
Old 02-08-2013, 08:09 AM
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I thought Vortech made centrifugal superchargers?
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  #38 (permalink)  
Old 02-08-2013, 08:37 AM
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Originally Posted by AutoGear View Post
I thought Vortech made centrifugal superchargers?
Vortech Superchargers

they most definitely do, "Vortec" is very overused by GM, and used by many other manufacturers too, you have to look closely at exactly what you're buying.
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  #39 (permalink)  
Old 02-08-2013, 10:50 AM
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Similar to the "only one good Vortec head" deal, I think the deal about "X" head being something special got wings when one of the pocket reference booklets decided to publish port volumes. There may be some X heads that have slightly larger port volume, but unless you were forced to use unported heads there's no real advantage to them IMO. Nowhere near the diff between Vortec heads over fuelie heads, that's for sure.

Last edited by cobalt327; 02-08-2013 at 11:06 AM.
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  #40 (permalink)  
Old 02-08-2013, 10:59 AM
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Quote:
Originally Posted by hcompton View Post
The 031 and the 906 are pretty much the same head and it is also the only vortech head that will out perform the 461. So yeah only one good vortech head. All the others are just as average as many of the regular casting heads. Some are much worse!
The 061 and 906 Vortec heads are the ONLY L31 Vortec heads, period. Any other head is NOT a Vortec in the context of 89Blackbird's question- which is production 5.7L L31 Vortec heads vs fuelies.

If you are trying to say heads like the swirl port truck heads are Vortec heads because they came on a Vortec engine, they are not the same thing- the swirl port heads (and other heads that came on the various Vortec truck engines) are not sold by GM as Vortec heads. BIG difference, a difference that is known and understood by anyone who's been paying attention since '96 or so...

Last edited by cobalt327; 02-08-2013 at 11:10 AM.
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  #41 (permalink)  
Old 02-12-2013, 01:16 PM
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You guys are saying pass on $200 vortec salvaged heads?

I did my 305 c10 up with them. A truck was Tee'd and totaled out. Could have got the whole 5.7L for $450. I just grabbed the heads. $179 for the 906 pair. They let me take the rockers, covers too.

Not to mention 16 x series II v6 springs (LS6).
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  #42 (permalink)  
Old 02-12-2013, 03:04 PM
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You guys are saying pass on $200 vortec salvaged heads?

I did my 305 c10 up with them. A truck was Tee'd and totaled out. Could have got the whole 5.7L for $450. I just grabbed the heads. $179 for the 906 pair. They let me take the rockers, covers too.

Not to mention 16 x series II v6 springs (LS6).
If you're not going to to a damn thing to them and they still meet your needs they're ok. BUT for only $400 more you can get a set of chinesium heads which while they are somewhat suspect are a LOT LESS suspect than the crack happy Vortecs that may need a valve job, springs, milled, cut guides, etc.
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  #43 (permalink)  
Old 02-17-2013, 01:57 AM
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Until the LS motors came out, the Vortec was the best head they'd ever built from the factory. So, if you get a good set, use them, but you won't approach the flow numbers of AFR, World, or Trickflow, especially on their more higher end models.
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