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Author Topic:   Vortec head question?
flanndad#17
Member
posted May 15, 2003 09:38 PM
I had 461's on my motor, just wondering what is the difference with vortec.
Can they use the same parts, tappet covers, rockers, intake?
Not really sure about them.

Also how would they rate compared to the other GM head

1 Aftermarket - Dart
2 Bowtie
3 Camel or Vortec
4 smog head

Does that look close?

sdhnc29
Member
posted May 15, 2003 10:31 PM
The hard part's will be the same , but you would need valve cover's for the Vortec head (valve cover adapters are available through GM to convert to non-center bolt cover's , but they are expensive and machine work is required to run most brands of roller rockers and stud girdles), as well as an intake manifold if you do not want to re-drill the heads for the older bolt pattern . They are ok with flat top pistons , but machine work is required for domed pistons . They are also fast burn heads , and they require less ignition timing than your 461's .

The heads you listed below , I would rate in the following order ;

1 Dart Heads
2 Bowtie Heads
3 Vortec Heads
4 Camel Hump Heads

An un-ported Bowtie and the Vortec head are very close in air flow up to about .550" lift , after that the Vortec drop's off in air flow quite rapidly .

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


racer038
Member
posted May 16, 2003 05:44 AM
When I bought my drilled and tapped vortecs from Pace, they recommended the self aligning rockers. I thought it was a good buy and then I could just pin the studs and not have the expense of s*rew in studs and guide plates. WRONG! I couldn't pin the studs myself. Then when I changed to a higher lift cam, the self-alignings wouldn't work. MY 2 CENTS. If you buy a dealer vortec, get the ones with the larger springs and already cut for s*rew in studs, then have someone you trust, check their work. A set of valve covers will run ~~$100 and the v/c gaskets are pricey too. When you price all this, the Darts don't seem too bad anymore.


Flanndad
Member
posted May 16, 2003 06:19 AM
Thanks, that's the kind of info I was looking for.
I'm kind of thinking I will keep looking for something other than Vortec's.


istock59
Member
posted May 16, 2003 03:42 PM
sdhnc29, what's your opinion on the Vortec head that's made by Pro-Action (or is it Pro-Lightning?)? About the same price as OEM Vortecs. Milled for guideplates already.


sdhnc29
Member
posted May 16, 2003 04:41 PM
Sounds like a good deal . I have not personally used or even had a set in my shop to give an opinion on though .

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


istock59
Member
posted May 18, 2003 12:11 PM
Thanks for the response Steve. What's your opinion on the Pro-Lightning stuff in general? Does it seem well made?


sdhnc29
Member
posted May 18, 2003 01:57 PM
The stuff I've seen look's pretty good . But I still prefer the Dart heads when it comes to 23deg. heads .

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


cmiller51
Member
posted May 20, 2003 04:08 PM
I'm curious about the ignition timing. What would you suggest for total advance, using Vortecs?


P5Racing
Member
posted May 20, 2003 04:14 PM
use the self aligning rockers. are have alot of push rods.


sdhnc29
Member
posted May 20, 2003 05:03 PM
Usually between 31-34 degree's of advance will be where a Vortec head engine work's best . The total timing will vary of course , depending on whether you have a flat top , or a small dome piston . If you have access , I'd run your car on a chassis dyno to see exactly how much timing your particular engine likes .

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


WPP
Member
posted May 20, 2003 07:45 PM
How much horsepower can you get out of 461 heads


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