Switching Heads, Swril to Vortec?
06-21-2009, 09:21 AM
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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!
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.
06-21-2009, 02:35 PM
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: 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!
06-21-2009, 08:34 PM
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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.
06-21-2009, 08:42 PM
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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?
07-05-2009, 12:38 PM
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Car: 1991 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3.23
Re: Switching Heads, Swril to Vortec?
how to 305 vortec compare to 350 vortec?
are the 350s way better?
are the 350s way better?
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07-05-2009, 02:13 PM
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Switching Heads, Swril to Vortec?
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.
07-05-2009, 02:29 PM
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
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?
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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