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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: thefarmboy21 on August 02, 2014, 11:01:46 pm

Title: Need some cylinder head help ASAP!!!! Swirl ports with sodium filled EX valves??
Post by: thefarmboy21 on August 02, 2014, 11:01:46 pm
I have a set of 191 swirl ports I was cleaning up to put on my 350 and noticed I had a burnt exhaust valve.....no biggie, get one anywhere right? WRONG!!!!! Turns out these are an HD casting and have regular 1.94 x 11/32 (.340) intake valve stems BUT use a 1.50 x 3/8 (.371) SODIUM filled exhaust valve that's tapered down with a normal 11/32 tip?!?!?!

Where the heck do I find one of these??? I looked up several years/models of 90's Chevys at the parts stores and NONE of them showed an HD exhaust valve. This one valve is all that's keeping me from assembling my motor and getting it in my 86 K20. A part number would be amazing!!! Thanks
Title: Re: Need some cylinder head help ASAP!!!! Swirl ports with sodium filled EX valves??
Post by: thefarmboy21 on August 02, 2014, 11:05:56 pm
OHHH and since a 90 model truck evidentally came with the HD heads on some and not others, are the valve seals in my gasket kit going to work on the exhaust side???
Title: Re: Need some cylinder head help ASAP!!!! Swirl ports with sodium filled EX valves??
Post by: Engineer on August 03, 2014, 12:48:05 am
I have a set like that on my '94 K2500.

I had to reuse my original exhaust seals.

As far as the valve, I would start calling the machine shops that specialize in automotive machining.
Title: Re: Need some cylinder head help ASAP!!!! Swirl ports with sodium filled EX valves??
Post by: thefarmboy21 on August 03, 2014, 07:19:08 am
So what's the chances of my valve seals fitting?
Title: Re: Need some cylinder head help ASAP!!!! Swirl ports with sodium filled EX valves??
Post by: VileZambonie on August 03, 2014, 10:21:17 am
Try 14095451 but if someone changed the guides you may need to have the machine shop fix it.
Title: Re: Need some cylinder head help ASAP!!!! Swirl ports with sodium filled EX valves??
Post by: thefarmboy21 on August 03, 2014, 03:43:20 pm
No the guides and valves are factory but the parts stores seem as if they don't exist. Which is why I'm thinking now that my valve seals aren't goin to fit.
Title: Re: Need some cylinder head help ASAP!!!! Swirl ports with sodium filled EX valves??
Post by: Engineer on August 03, 2014, 04:54:15 pm
The 11/32" valve seals that came with your kit will not work.
Title: Re: Need some cylinder head help ASAP!!!! Swirl ports with sodium filled EX valves??
Post by: thefarmboy21 on August 03, 2014, 07:58:08 pm
Well I miraculously found a set of fresh ground, but used valves on eBay, for only $30 to the door. O'reilly and autozone was gonna be $16.99 per valve and they weren't even sodium filled.

So now I just gotta wait and in the mean time try to find a darn gasket kit with the right valve seals. I'm gonna browse my catalogs and call the local machine shop tomorrow and see what happens.