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Switching Heads, Swril to Vortec?

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Old 06-21-2009 | 09:21 AM
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From: Essex Vermont
Car: 89 Camaro RS, 79 Camaro z28
Engine: 385 stroker
Transmission: 700R4
Axle/Gears: 3.23 posi borg warner
Switching Heads, Swril to Vortec?

I have the stock 14102187 "swril port" heads on my car. 58cc? from what i can tell. i have a pair of 12558059 casting heads with the same valves but are "Vortec" and they are 64cc. Will i have any issues switching them over? i also have the crank and pistons from the same engine. The Block was frozen. has any body made this switch? just want to get some info on it before i go ahead and do it. Thanks!
Old 06-21-2009 | 12:30 PM
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Car: 1992 Camaro RS, 66 Mustang, 78 t/a
Engine: 5.0 TBI, 289, 400
Transmission: 700R4, C4, th350
Re: Switching Heads, Swril to Vortec?

well, you will need a vortec intake manifold.
Old 06-21-2009 | 02:35 PM
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From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Switching Heads, Swril to Vortec?

Originally Posted by vt89rs
I have the stock 14102187 "swril port" heads on my car. 58cc? from what i can tell. i have a pair of 12558059 casting heads with the same valves but are "Vortec" and they are 64cc. Will i have any issues switching them over? i also have the crank and pistons from the same engine. The Block was frozen. has any body made this switch? just want to get some info on it before i go ahead and do it. Thanks!
059 vortecs are 305 vortec heads and should be 58cc stock.
Old 06-21-2009 | 08:34 PM
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From: Essex Vermont
Car: 89 Camaro RS, 79 Camaro z28
Engine: 385 stroker
Transmission: 700R4
Axle/Gears: 3.23 posi borg warner
Re: Switching Heads, Swril to Vortec?

i have a edelbrock vortec style intake for it also. As far as the cc of the heads are i have a parts interchange book and says that the 059 are 64cc and when you google the casting the same comes up.
Old 06-21-2009 | 08:42 PM
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From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Switching Heads, Swril to Vortec?

Originally Posted by vt89rs
i have a edelbrock vortec style intake for it also. As far as the cc of the heads are i have a parts interchange book and says that the 059 are 64cc and when you google the casting the same comes up.
These are the 58cc chambers on my 059s.

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Old 07-03-2009 | 06:40 AM
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Car: 93 GM300 platforms
Engine: LO3, LO5
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Re: Switching Heads, Swril to Vortec?

Wow. They really are swirl port, except that the ramp doesn't wrap around the valve stem boss as much as on 187/191/193/810 TBI heads so the ramp tip doesn't block airflow. I know you ported them and got great numbers, so I expect they run/burn very well. How much effort did you put into reducing the timing advance? And what max advance do you run ? I take it that this is in the van right?
Old 07-05-2009 | 12:38 PM
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From: Griffin,GA
Car: 1991 Camaro RS
Engine: 305 TBI
Transmission: 700R4
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Re: Switching Heads, Swril to Vortec?

how to 305 vortec compare to 350 vortec?

are the 350s way better?
Old 07-05-2009 | 02:13 PM
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From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Switching Heads, Swril to Vortec?

Originally Posted by HypnoToad
how to 305 vortec compare to 350 vortec?

are the 350s way better?
They are ALMOST equal in flow stock to stock. The 305 heads have a chamber designed for a 3.735" bore while the 350 heads have a chamber designed for a 4.00" bore. The 305 head is a MUCH better choice than the 350 head on a 305. With the 305 head, you have almost the same flow as a 350 head, keep your compression ratio, and get a much better burn than the 350 heads on a 305.
Old 07-05-2009 | 02:29 PM
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From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Switching Heads, Swril to Vortec?

Originally Posted by kdrolt
Wow. They really are swirl port, except that the ramp doesn't wrap around the valve stem boss as much as on 187/191/193/810 TBI heads so the ramp tip doesn't block airflow. I know you ported them and got great numbers, so I expect they run/burn very well. How much effort did you put into reducing the timing advance? And what max advance do you run ? I take it that this is in the van right?
You have read through the thread of my 310 TPI buildup running these heads.

I put some effort into the advance curve while tuning the setup. It ran 30* total timing all in around 4,500 rpm and a very mild rate. It was in the van and ran very well. Today, I think I could have made even more hp/tq with a different cam grind. I would have narrowed the LSA and shortened the duration some.
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