Are Vortec heads better than 2.02 double hump heads? - Team Camaro Tech
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  #1  
Old Nov 15th, 05, 06:21 AM
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Brentmc Brentmc is offline
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Default Are Vortec heads better than 2.02 double hump heads?

All,

I am getting two different opinions on which heads I should use on my 350.
The current recommendation is that I change the heads to either Vortec or 2.02 double hump.

Either way the motor is acting as if it is really mismatched parts-wise and I want to wake it up.

Can you all please help me sort this out?

I have:
-GM Goodwrench crate motor
-Stock cast iron heads -- valves (I/E): 1.94"/1.50"
-8.5:1 compression
-Cast Iron 4-Bolt Main

Cam:
Comp Cams Hyd 280H Cam CL12-212-2
Operating Range: 2000-6000 RPM
Duration: 280 Intake / 280 Exhaust
Duration @ .050'' Lift: 230 Intake / 230 Exhaust
Valve Lift w/1.5 Rockers: .480'' Intake / .480'' Exhaust
Lobe Separation Angle: 110

-Edlebrock 600 cfm carb
-Weiand 8004 dual plane intake
-TCI Sizzler Torque Converter (400 rpm over stock)
-TH350 transmission
-3:73 posi rear

I really appreciate any advice you all can give as to how I can wake this motor up without breaking the bank.
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  #2  
Old Nov 15th, 05, 06:45 AM
Busted Knuckles Busted Knuckles is offline
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Default Re: Are Vortec heads better than 2.02 double hump heads?

Unless your double humps have been ported by a pro, chances are that the Vortecs will make a bit more power as well as being more efficient.
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  #3  
Old Nov 15th, 05, 07:03 AM
oger oger is offline
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Default Re: Are Vortec heads better than 2.02 double hump heads?

No question Vortecs. I have a pretty simular combo only with less cam (XE-256) mine runs real well for being not much of a motor. With .480 lift you may have to have the guides cut.
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  #4  
Old Nov 15th, 05, 07:05 AM
Toy Junkie Toy Junkie is offline

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Default Re: Are Vortec heads better than 2.02 double hump heads?

http://carcraft.com/techarticles/116_head_cat1/ Here's a good link for flow comparison on both heads.
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  #5  
Old Nov 15th, 05, 07:11 AM
Racing 68 Racing 68 is offline
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Default Re: Are Vortec heads better than 2.02 double hump heads?

Compression is a little low for a 230 duration cam should be near 9.25-9.75 on pump gas depending on octane. A stock vortec will usually flow about the same as a double hump with 2.02 1.6 valves.
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  #6  
Old Nov 15th, 05, 07:25 AM
DOUG G DOUG G is online now
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Default Re: Are Vortec heads better than 2.02 double hump heads?

I agree, 8.5:1 is low for that cam.

Up the compression and get some better flowing heads. Vortecs are said to be better than the old 2.02's (have to remember the 2.02's are old school)
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  #7  
Old Nov 15th, 05, 07:26 AM
Motorhead62 Motorhead62 is offline
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Cool Re: Are Vortec heads better than 2.02 double hump heads?

Hands down the Vortechs are better. Just compare the chamber design of both heads. The Vortechs have the modern heart shaped chamber and double humps have wedge chambers. The Vortechs have a higher velocity in the ports and unshrouding of the valves in the chambers.

The only draw back to stock Vortechs is amount of valve lift they will take. Above about .460 -.470 lift the retainer will make contact with the valve seals. To fix this the heads need to be machined for better valve seals and clearance.

The Scoggin Dickey Performance Center in Lubbock Texas sells the Vortech heads with the upgrades needed for a performance engine.
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  #8  
Old Nov 15th, 05, 08:45 AM
Eric68 Eric68 is offline
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Default Re: Are Vortec heads better than 2.02 double hump heads?

Not only do the Vortecs flow a lot better, but you will pick up additional power for two other reasons. 1) the Vortec combustion chamber is a better (modern) design, is more efficient, and will make more power 2) the Vortec combustion chamber is smaller (64cc) and will increase your compression ratio by a point.

Overall, I'd say that the Vortecs would be a perfect swap for your current combo. You will need to check valve guide to retainer clearance though and you will need guided rocker arms and a Vortec style intake (I'd suggest the Performer RPM)
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  #9  
Old Nov 15th, 05, 09:57 AM
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Brentmc Brentmc is offline
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Default Re: Are Vortec heads better than 2.02 double hump heads?

Once I add the Vortec heads, will my set-up be pretty much optimized with the rest of what I have?


I have used Vortec heads that need machined and set-up. I'm thinking it might be cheaper to just buy new ones already set-up...

Brent
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  #10  
Old Nov 15th, 05, 10:50 AM
69CamaroRacer 69CamaroRacer is offline
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Default Re: Are Vortec heads better than 2.02 double hump heads?

you can look at it this way .. back in the 60's and early 70's your double hump heads were the hot ticket but now we have much better tech and have the ability to make an entire head in CG and test it before it is even milled. So i would think just by thoes figures alone the Vortec heads would be better. THen compair the flow numbers and there is no question that the combination of Modern combustion chambers and superior flow numbers gives u a better head.
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  #11  
Old Nov 15th, 05, 11:39 AM
deerhunter deerhunter is offline
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Default Re: Are Vortec heads better than 2.02 double hump heads?

Some of it depends on how much money you want to part with. Vortecs are great if you have the money to buy everything you need to run them. Camel humps work pretty good if you are on a tight budget because there are a lot of them on the market.
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  #12  
Old Nov 15th, 05, 11:41 AM
Eric68 Eric68 is offline
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Default Re: Are Vortec heads better than 2.02 double hump heads?

I think your engine will be pretty close to optimized with the Vortecs.

The Vortecs actually will work best with a dual pattern cam (more duration on the exhaust than on the intake) and your converter is a hair on the tight side. My guess is that the "perfect" cam would probably pick you up another 10 or 15 HP -- not a whole lot. A looser/better converter would help acceleration IMO.

But if money is tight, you are spending it in the right place with the Vortecs.
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  #13  
Old Nov 15th, 05, 01:19 PM
Motorhead62 Motorhead62 is offline
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Cool Re: Are Vortec heads better than 2.02 double hump heads?

I think the 280 magnum would be a good cam choice. The Vortechs will bring your compression up where it needs to be for a strong street engine.

Check out the link below. If you have not yet purchased your heads, check these out. Hassel free installation in a kit.

http://www.sdpc2000.com/catalog/2172...-Head-Kits.htm

Good Luck!
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  #14  
Old Nov 15th, 05, 03:28 PM
TexasPerfProd TexasPerfProd is offline
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Default Re: Are Vortec heads better than 2.02 double hump heads?

I know this discussion was about the Vortec heads as a solution but I just checked Motorhead62 link. Am I reading that correct that for some
Quote:
Stock Vortec head kits - features stock out of the box Vortec heads that are good for about 0.450" lift.
you are paying
Quote:
$679.90
? I guess this just blowes me away that a STOCK head would bring this kind of money. Especially when you can purchase a aftermarket head designed with:
Screw in studs,
Guidplates,
High velocity intake runners on the street versions.
Thats not to mention if you order them complete you get:
Screw in studs,
Guidplates,
1 piece Stainless valves usually in your choice of size 2.02, 2.055, 0r 2.08
Aluminum Heads that cost less to ship
Can be repaired in the event of a blown engine mishap,
Better cooling,
Can run higher street compression ratios on pump gas.
Cheaper and or easier to port if you like.

I mean your paying $700.00 atleast with shipping they are Iron right, for a STOCK head with some aftermarket springs. that are
Quote:
good for about 0.450" lift
I just dont get it can someone please tell me why? I mean for another 100.00 you can have all the good stuff.
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  #15  
Old Nov 15th, 05, 03:44 PM
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BonzoHansen BonzoHansen is offline
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Default Re: Are Vortec heads better than 2.02 double hump heads?

I see used sets of vortecs going for $200. If we are only comparing them to used double humps.
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