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Re: 1995 heads
Dw89xj #748168 May 08th 2019 11:05 am
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What are swirl port heads? The crate Goodwrench engine I bought said it had them. It was a350. Light truck engine I put in my 90 g20. It was for 86 _95 I think. I got it from Jeg,s.

Last edited by Lionvan; May 08th 2019 11:07 am.
Re: 1995 heads
Lionvan #748185 May 08th 2019 2:17 pm
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Originally Posted by Lionvan
What are swirl port heads? The crate Goodwrench engine I bought said it had them. It was a350. Light truck engine I put in my 90 g20. It was for 86 _95 I think. I got it from Jeg,s.


https://www.thirdgen.org/forums/attachments/tbi/83171d1100905955-swirl-port-heads-why-ports.png

Re: 1995 heads
Dw89xj #748186 May 08th 2019 2:21 pm
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There is a lot of misinformation on the net about the swirl port heads. Some say they are for mileage and torque. I got a lot more torque out of the vortec heads and the mileage is very close to the same, maybe even a bit better. The vortec heads have the more efficient chamber too. Chamber shape does make a difference.

Last edited by Don_F; May 08th 2019 2:21 pm.
Re: 1995 heads
Dw89xj #748214 May 09th 2019 11:54 am
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They are a point in time. They were a way to boost port velocity (they are basically only half the width of a conventional port by the time you reach the valve). With that velocity and swirl comes a boost in low rpm torque. But like running a marathon with your nose half plugged up, they don't breath well at higher rpm. They served a purpose...with TBI, they gave very crisp throttle response, and very good low end torque.

Time marches on, and the next generation of SBC engine uses Vortec heads, the best iron SBC head GM ever produced...they had learned a lot about head flow and chamber designs in this time. They also gain roller cams of a more aggressive profile Vs TBI, and multi-point fuel injection. So torque and power are up.

In this case, newer is better, but that doesn't mean older is garbage. It just depends on your goals.

Re: 1995 heads
Dw89xj #748215 May 09th 2019 1:05 pm
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I guess that's why they put them on the trucks. More oomph to get the load moving.

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