Did all the LO3 equipped cars come with swirl port heads? If not which ones came with these heads?

 

As far as I know, and I could be wrong, they all come with the swirl port heads.

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--Spyder--

1992 Camaro RS
LO3, T-56,centerforce clutch, ported and polished heads, Edelbrock Performer Intake, 14X3 Open Element w/ K&N, hiflow cats with two pipes going back, AC delete, SMOG delete, alu drive shaft, 3.73 posi, 170 stat w/ fan switch, STB, Subframe connectors, KYB AGX, Eagle GSC, and poly bushings.

1982 Z-28
327ci CSB, Turbo 350

 

from everything i have ever scene we all suffered from the swirl port epidemic.

lata
tim

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91 Camaro RS-LO3,Auto.
14.209@95.46mph
Best 60' 1.917
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What kind of gain could be had by changing the stock swirl ports for stock nonswirl port heads? Or isn't it worth the trouble?

[This message has been edited by ahusted (edited May 01, 2001).]

 

yes, putting on some 305 TPI heads should be worth the trouble. You can even clean them up a bit. little polishing and pocket porting.

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-Tas
'89 Formula WS-6

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

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Swirl baaaadddddd, Vortec gooooooddddd!
The swirl ports REALLY limit the engines hp potential. It blocks half of the port entrance to creat a swirl. It does this on every intake port so it's as if you blocked off half of the TB and ran some nice heads. After the crossfire idea flopped you would think GM would try and avoid the "swirl"!

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, Jon (350 TBI!)
91 Red My website

 

Yeah, those ports don't seen like a smart idea. Especially if you mate those heads to a "regular" intake with normal ports in them. MAJOR MISMATCH and turbulence going on there where the air "hits" the blocked-port area. Not good.

I have heard that you can remove the heads and remove the "blocking" material around the intake ports to make the heads into non-swirl imitations and it helps a lot when matched with regular intake manifolds. Should be too hard or cost too much, gaskets and a few metal removal tool bits. Just match the ports to an Edelbrock 1204 gasket or something like that.

Anyone done this? Just curious. I have never seen these heads myself and don't know how much metal is "blocking". Can anyone clarify this? I mean, is it A LOT of material or just like 1/8 of an inch in one corner or something???

 

The "swirl" area is not really in the port, its in the bowl area.. there would be no kind of mismatch if you ran a different manifold with them. You can seriously grind down the swirl ramp where it obstructs flow but the whole shape of the roof in the bowl area is all wrong anyways it doesnt slope downward or anything

Ive seen some ok numbers from a heavily ported set. BUt i personally would not know how to go about reshaping the bowl area as it goes against all the shapes ive ever seen to port to

 

and if you really wanna know what they look like i have two sets of those heads in my garage.. ill sell one pair for 30 bux you pay shipping

 

no thanks. Sell them locally and use the money for some cigs in BT, if you smoke.

 

uh, no i dont and if i did that wouldnt fly over there