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Extreme Veteran
Posts: 443
 
Location: Beaumont TX | I'm getting my heads worked on and my mechanic says I need new valves. He says I need all 16 valve but I think I only need 4 intake and 4 exhaust valves, enough for one side. But that doesn't matter.
Does anyone know where a good place is to order new valves for 1955 Plymouth 259 Poly head engine? |
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Extreme Veteran
Posts: 580
| You might try Terrill Machine in Texas somewhere.
I bought valves for a 6 cyl. flathead from them so they might have what you need. |
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Expert 5K+
Posts: 9654
 
Location: So. Cal | I would bet that Hot Heads has them. You probably can even swap in larger 315 valves instead of the originals. Usually, all the exhaust valves are too worn to reuse, but the intakes are often OK. But if it were me, I would upgrade everything to the larger size now, and use 110 lb static pressure springs so you can put a decent profile cam into it and it will maintain decent seat pressures. Give them a call.
I have a set of 325 poly heads available that will likely flow better than your originals, but probably not worth the shipping cost, and they might decrease your compression a little with a larger chamber. |
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Extreme Veteran
Posts: 443
Location: Beaumont TX | Thanks Nathan, I'll call Hot Heads. I don't know about valve numbers like the "larger 315" valves but I'll ask Hot Heads about this too. And I'll also ask them about the springs.
Will your 325 Poly heads fit my engine and rocker assemblies? I'm not familiar with this and don't know why they would be better. And don't understand the fit up. |
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Expert 5K+
Posts: 9654
Location: So. Cal | Yes, it's the same engine family. All heads will swap between all the early Dodge V8 engines (sometimes with minor modifications). The later 325 heads have bigger valves, a larger combustion chamber and bigger ports. |
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Extreme Veteran
Posts: 443
Location: Beaumont TX | I am finding NOS exhaust valves on ebay. Would it be better to use these or the newer aftermarket valves? |
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Expert
Posts: 3033
Location: N.W. Fla. | On the Dodge Hemis all short deck heads 241 & 270 interchange with the high deck heads 315 &325. I'd assume same for Poly. These Polys can be converted to Hemi using hemi heads, pistons & ex. Mans. Bob at Hot Heads can answer all of the valve questions about size, ect. Most Hemis up thru '55 had hardened seats and valves, something also to ask about. |
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Elite Veteran
Posts: 888
Location: Peoples Republic of Oregon | If your goal is to simply rebuild the heads and tighten up the top end then the NOS valves are the way to go, nothing easier than one-for-one replacement.
If you have need for a complete rebuild with some go-fast parts then the story gets a bit more complicated.
Feel free to call and chat if you have detailed questions.
My web master is working on some tech issues with my website so it is down for a bit.
Edited by wayfarer 2023-05-28 11:17 AM
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Extreme Veteran
Posts: 443
Location: Beaumont TX | Thanks George and Gary for your reply's. I'm just trying to fix my Poly heads back to original. Hot Heads told me to go to Egge to get them and Egge can make them. I have found some NOS on Ebay.
Can someone double check me here. I have a 1955 259 V8 Poly Head engine.
I find in the parts catalog that the exhaust valves are 1852 249 and the intake valves are 1614 664. I see some valves on Ebay that say they are 1614 655 and they claim they are a replacement for 1852 249. Do you all think this is really correct? I can buy form several different sellers and get a full set of valves I think but just want to make certain I order the correct valves.
Thanks for all the help....
Sam |
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Expert 5K+
Posts: 9654
Location: So. Cal | I don't know, but I'm thinking that 1852249 number is a misprint. None of the oversize version part numbers start with anything close to that number and these valves were no longer in use after 1956. So it's improbable that the part number would start up that high unless it was re-designed later on for some strange reason. My guess is that the 1614655 number is the proper original part number for those valves, but this is just a guess. It's clear that because of the misprint, or whatever it is, that there would be some confusion around it. I suggest that you measure one of your valves very carefully and compare them: Head diameter, stem diameter, and length. If you get a match there, you shouldn't have a problem.
Also, note that the 259 valves are the same valves used on the 270 Dodge poly motor. So that may help you in your search. |
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Extreme Veteran
Posts: 443
Location: Beaumont TX | Thanks a lot Nathan. Very helpful. When I get the new valves, I'll use my micrometer to check all of the dimensions.
And I'll look into the 270 Poly stuff. I talked to Hot Heads and they didn't have any of my valves but they told me how to handle it. They are amazingly helpful... Just a great company. |
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Extreme Veteran
Posts: 443
Location: Beaumont TX | Hi Nathan,
I think I have an idea on the 1614 665 exhaust valve versus the 1852 249 exhaust valve. Why the different numbers???
My car has domed face exhaust valves. In the service manual on page 203, it shows a domed face exhaust valve which is just like I have. So I'm pretty sure the original exhaust valve for a 1955 engine was a dome faced valve.
Looking through Ebay, dome faced exhaust valves are 1614 655. I can see this on the pictures from multiple sellers that dome faced valves are in the boxes labeled 1614 655. So I think the valves in my car are 1614 655.
My parts manual on page 9-48 shows the exhaust valve number for my car to be 1852 249. This page in my parts manual was printed on May 12, 1958. When I look on Ebay at part numbers 1852 259, the face of the exhaust valve is flat. It actually looks like it is domed in a little and has a ridge machined around the face of the edge of the valves. It looks like newer valves do.
I don't have an older print of a parts catalog but I think a 1955 or 1956 print will show 1614 665 for the exhaust valve number and sometimes a little later, Chrysler replaced the 1614 655 round head valves with 1852 249 flat head valves. Maybe this is a better functioning valve design.
So, I think original exhaust valves for 1955 were 1614 655 and the (upgraded???) replacement valves were 1852 249.
This is probably not real important but maybe can help someone.
I think I can search several buyers and get a full set of each number. It may not hurt to mix and match but I'm going to try to get all of one or all of the other.. |
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Veteran
Posts: 148
Location: Mandurah, Western Australia | My 55-56 parts manual shows the 259 poly exhaust valve is 1614 665 |
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Expert 5K+
Posts: 9654
Location: So. Cal | If you're keeping your stock pistons, I would prefer the domed valves as those would retain a higher compression ratio in the chamber. You'll lose compression with the others. The flat valves are lighter and less prone to valve float, but if you replace your stock springs with stiffer ones, as I recommend, that won't be a problem.
Edited by Powerflite 2023-06-01 1:34 PM
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Extreme Veteran
Posts: 443
Location: Beaumont TX | Hello Westaus29. What is the date on the bottom of the page that shows the part number 1614 665? I think it will be earlier than 1958 and that will validate my thinking on this.
Thanks,
Sam
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Replacement Valves for 259 Poly
