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| GMC V6 and V12 Engines Engine repair and rebuilding |
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#1
December 19th, 2014, 10:53 PM
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Replacing sodium filled valves and valve rotator
OK, first of all, I am new to the forum. What brought me here, a big ol'
702 V-12. OK, I know the internal parts are 351 V-6. So, I have so few questions for the GURU's out there. 1. Can the sodium filled valves be replace, if so, what is recommended? If you have part number, that would be helpful. 2. This engine has rotators on all the valves. Is it possible to eliminate these ? I see Comp Cams has a cup that eliminates the rotator, is it a viable option? This will not be a race engine, but will have a street cam grind. Or, does anyone have a source for the rotators? Thanks Atomman 
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#2
December 20th, 2014, 01:02 AM
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Re: Replacing sodium filled valves and valve rotator
Yes you can replace the sodium filled exhaust valves with valves from a Caterpillar Diesel, I used to have the part numbers but long gone, they're either from a 3406 or 3116 engine. You can also go with some custom Manley stainless steel valves, it's a good decision to get rid of the hollow stem stock valves as they were notorious for snapping when removing the governors off any of the bigger GMC 60 degree family of engines and running them at higher rpms. You can eliminate the rotors since light duty 305 engines were not always equipped with rotators, then you would have come up with longer valve springs that are used in 305 engines without rotators. I'm using Ford 390 valve springs on my 478 V6 because of the higher lift custom ground cam but I did retain the rotators. What applications are the valve rotator eliminator cups for?
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#3
December 20th, 2014, 02:42 AM
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Re: Replacing sodium filled valves and valve rotator
Not sure about the application for the rotator eliminators from comp cams. Just read about them. Still need to follow up on that.
Thanks Atomman
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#4
December 23rd, 2014, 08:27 PM
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Re: Replacing sodium filled valves and valve rotator
Speaking of Sodium filled valves, see the eBay auction at http://www.ebay.com/itm/221641066347. More important is the seller data for members to check out.
Obsolete Automotive Wholesale of VA LLC.
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