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05-23-2020, 09:08 PM
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#1 |
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Registered User
Join Date: Nov 2016
Location: Charlotte
Posts: 9
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Gen 1 small block with 906 Vortec heads
In the process of putting a new cam and Vortec 903 heads on my GMC. I've seen some posts talking about water cross over hoses for cooling. Can someone shed some info on this and maybe some pictures if you have them.
Thanks |
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05-24-2020, 04:28 AM
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#2 |
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Registered User
Join Date: Jul 2012
Location: Whitehorse yukon
Posts: 1,218
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Re: Gen 1 small block with 906 Vortec heads
Would that be a 906 casting number ?
I do not rember my 99 or my bros 98 having stock steam lines on heads The one thing i will say pay attention to valve lift stock is safe to say around .420 I built an engine when i was much younger used the 300 hp vette cam same stock 70s heads as a prievios build same castings numbers but valve bind Ate the cam Getting the last few parts for a roller cam 350 with 262 vortec heads |
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05-24-2020, 06:21 AM
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#3 | |
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Registered User
Join Date: Nov 2016
Location: Charlotte
Posts: 9
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Quote:
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05-24-2020, 06:24 AM
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#4 | |
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Registered User
Join Date: Nov 2016
Location: Charlotte
Posts: 9
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Quote:
The heads have all the necessary machining and have springs good for .570 lift. But do I need to do anything to the heads for cooling or can I just bolt them on? Posted via Mobile Device |
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05-24-2020, 08:45 AM
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#5 |
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Senior Member
 
Join Date: Mar 2012
Location: Chesapeake, Va
Posts: 1,275
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Re: Gen 1 small block with 906 Vortec heads
I drilled 1/16 a small hole in the thermostat for water to flow, or you can run a bypass line to the intake from the water pump. i have a vortec top end and no steam lines.
__________________
Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks 
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05-24-2020, 08:49 AM
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#6 |
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Senior Member
Join Date: Mar 2012
Location: Chesapeake, Va
Posts: 1,275
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Re: Gen 1 small block with 906 Vortec heads
__________________
Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks
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05-24-2020, 12:33 PM
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#7 |
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Senior Member
Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,852
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Re: Gen 1 small block with 906 Vortec heads
Here's a link to a recent thread that may help.
https://67-72chevytrucks.com/vboard/...d.php?t=804394
__________________
Jim |
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05-24-2020, 04:35 PM
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#8 |
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Registered User
Join Date: Nov 2016
Location: Charlotte
Posts: 9
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Re: Gen 1 small block with 906 Vortec heads
Thanks that's what I needed.
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