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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old April 24th, 2013, 06:07 PM
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BossChevy62 BossChevy62 is offline
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Default Rebuild Stalled - Need Valves - HELP!

Hello everyone, I am rebuilding my 305 and I am stalled out because the machine shop says I need new intake valves. Apparently my valves have had one too many valve jobs done, and they are running out of material on the valve head. My truck has been sitting for 3 months while I and the machine shop have been looking for valves with no luck. If anyone has a set they can sell me, or knows of a good part number I would greatly appreciate it. These valves are the last piece of the puzzle for my complete rebuild. I would be willing to accept used valves as long as they are in good usable condition.
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  #2  
Old April 24th, 2013, 07:52 PM
raycow raycow is offline
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Default Re: Rebuild Stalled - Need Valves - HELP!

Kanter lists intake valves for the 305. Have you checked to see if they have them in stock?
http://www.kanter.com/truck/trgmcn.html

Ray
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Old April 24th, 2013, 08:58 PM
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BossChevy62 BossChevy62 is offline
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Default Re: Rebuild Stalled - Need Valves - HELP!

Yes, I tried Kanter first, unfortunately they do not have any in stock, and their vendors do not have access to any either, it is a dead part number with no known sources.
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Old April 24th, 2013, 11:13 PM
raycow raycow is offline
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Default Re: Rebuild Stalled - Need Valves - HELP!

Ok, now it looks like time for Plan B:

It might be easier to substitute a valve made for a different engine. Back when I worked in the parts business I did this a few times on my own projects with entirely satisfactory results.

Obviously critical dimensions are head diameter, stem diameter, overall length, and (sometimes) face angle. You can grind down a valve head that is slightly oversize or off by a degree or two. Keeper grooves can sometimes be a worse problem. You can often substitute a valve with the "wrong" grooves as long as you can get the keepers and retainer that belong to the valve you are using. Normally, an exhaust valve can be used to replace an intake, but not necessarily the reverse.

Start here, and happy hunting!
http://www.mellingengine.com/Portals...%20291-293.pdf

Ray
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Old April 24th, 2013, 11:26 PM
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Default Re: Rebuild Stalled - Need Valves - HELP!

Ray, good post, but I tried that too, the only valves long enough are the wrong stem diameter, and turning the stem down doesn't sound like a cost effective solution. One of our members in Spokane is checking his spare parts for good valves for me, lets all cross our fingers for him/me.
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Old April 25th, 2013, 12:15 AM
bigblockv6 bigblockv6 is offline
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Default Re: Rebuild Stalled - Need Valves - HELP!

I may have a complete set of new intake & exhaust valves for the 305 V6 that I can sell you. I have no need to hang to them since my interest is in larger 379 through 478 V6 engines as well as 351E & M engines. Pete Chronis Northern Cal. 68 KM-2500 478M V6.
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Old April 25th, 2013, 03:06 PM
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Default Re: Rebuild Stalled - Need Valves - HELP!

Pete, if you have a complete set of valves, I am interested in purchasing them, since this current 305 probably won't be my last, and it will be nice to have more than I need. Check your stock and let me know what you want for them. Thanks.
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Old June 5th, 2013, 02:23 AM
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Default Re: Rebuild Stalled - Need Valves - HELP!

Update: I got 4 valves from Peter Chronis(Thank you Peter), but I am still in need of 2 intake valves. My truck is sitting in the shop collecting dust until I can get those last 2 intake valves, so if there is anyone who can help me out I will be grateful.
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Old June 12th, 2013, 04:03 AM
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Default Re: Rebuild Stalled - Need Valves - HELP!

Set of rebuilt 305 heads of Ebay for $100 with no bids. Only problem looks to be shipping. Seller shows $160 for the shipping from Colorado. See listing here (obviously not mine):

http://www.ebay.com/itm/1966-67-GMC-...dffe41&vxp=mtr

Regards,
Steve
New Orleans
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