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Magnifluxing may be a good idea. It does have all new valves and guides so I doubt they would have done that if it had been cracked. Before buying I posted a question on Ebay and was assured it had never been cracked or welded and the owner reiterated that again today when I spoke with him.
Steve D
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Magnifluxing may be a good idea. It does have all new valves and guides so I doubt they would have done that if it had been cracked. Before buying I posted a question on Ebay and was assured it had never been cracked or welded and the owner reiterated that again today when I spoke with him. Well, it's much like flipping a coin, isn't it, whether to accept statements or not. Guess one has to go with his gut feelings. One item worth mentioning, I think, is the fact that "modern engine builders" tend to use the same guide to stem clearances / tolerances for the 235 valves, which may be too tight.
1951 Chevy Styleline Deluxe 2 door sedan / purchased from second owner 6-19-2000.
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Gut feelings and verification. My friend that is helping has been a mechanical and electronic technician for over forty years. His last job was the mechanical rebuilding of a 31 Chevy before retiring from a restoration shop. One job was assembling an early Buick engine from two used ones and another a complete mechanical rebuild on a 36 Ford Phaeton. I will pass on the info on the valve guide clearance as there is no such thing as too much knowledge.
Steve D
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The 235 engine called for .001"-.003" for the intakes and .002"-.004" for the exhausts. I would stay at the greater clearences.
Last edited by Chev Nut; 03/04/16 12:05 AM.
Gene Schneider
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Thank you for that info. I have emailed it to my friend.
Steve D
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I decided that it's best to have it magnafluxed so today i started removing the valves. It has seals on all of the guides and I need to know how to remove them without damaging them. The oil on the springs and valve stems is black, but I don't know if its paint or just dirty oil. While it's at the machine shop for magnafluxing it will be cleaned of ALL paint. I spoke with the seller and he says he will pay for any work that needs doing, but he is a long way off. We'll see how that goes.
Steve D
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If the O ring seals on the valve stems are installed (correctly) the external seals are not necessary.
The 235's don't get that much oil upstairs compared to a small block.
Gene Schneider
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That is the same advise I just got from my friend who is helping me. He was not around when I started taking it apart. Good to know you are both have the same opinion.
Steve D
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I decided that it's best to have it magnafluxed so today i started removing the valves. It has seals on all of the guides and I need to know how to remove them without damaging them. The oil on the springs and valve stems is black, but I don't know if its paint or just dirty oil. While it's at the machine shop for magnafluxing it will be cleaned of ALL paint. I spoke with the seller and he says he will pay for any work that needs doing, but he is a long way off. We'll see how that goes. Magnafluxing the head is good to do, discovering the actual head condition and for your own peace of mind. 
1951 Chevy Styleline Deluxe 2 door sedan / purchased from second owner 6-19-2000.
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By installed correctly Gene I believe that means the oring (actually a quad ring) is seated in the lower groove and not twisted. If there are any other tips I welcome the information.
Steve D
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Important to first compress the valve spring and retainer cap. Then install the O ring and keepers, carefully releasing the spring and cap. Some install the O ring and then compress. This can pull the O ring out of the grove in the valve.
Gene Schneider
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I had the head tested and cleaned and now have it back. The shop that did it said it is excellent condition with all new valves and springs and other than the paint where it should not have been all machining was good. They also vacuum tested it so it is good to go. Now I will see if the seller lives up to his end of the bargain and pays for the additional work which was $216.06.
Steve D
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I had the head tested and cleaned and now have it back. The shop that did it said it is excellent condition with all new valves and springs and other than the paint where it should not have been all machining was good. They also vacuum tested it so it is good to go. Now I will see if the seller lives up to his end of the bargain and pays for the additional work which was $216.06. Magnafluxed or not ?
1951 Chevy Styleline Deluxe 2 door sedan / purchased from second owner 6-19-2000.
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Magnafluxed and pressure tested in addition to vacuum tested for valve seat seal condition. Photos to be posted in members photos. ( If I had the setting correct). More on that later.
Steve D
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Just thought I would update that I received a check today from the seller. It was very quick and without any third degree conversations. I am very pleased with the head and am now hoping my engine parts will arrive soon so I can get the engine together .
Steve D
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It sure is heartening when people stand behind what they say and do. Fortunately many of the old Chevy folks are that way.
How Sweet the roar of a Chevy four!
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I can say I was honestly impressed with the owners handling of the situation. When I told him of my concerns he apologized and immediately offered to remedy the situation. Also when I phoned his shop he did not avoid me and even gave me his cell phone number and said to call him when I knew what the cost was going to be. I did that last Weds. and got his check today. Certainly is much better service than I am getting from another vendor who had no problem charging my credit card three weeks ago and has yet to ship a single part. They will likely be the subject of another post but not till I receive my parts.
Steve D
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Did you install valve stem seals when reassembling?
Gene Schneider
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The shop that checked it out did the re-assembly and put all new oring seals on the valve stems and left off the seals on the guides.
Steve D
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I can say I was honestly impressed with the owners handling of the situation. When I told him of my concerns he apologized and immediately offered to remedy the situation. Also when I phoned his shop he did not avoid me and even gave me his cell phone number and said to call him when I knew what the cost was going to be. I did that last Weds. and got his check today. Certainly is much better service than I am getting from another vendor who had no problem charging my credit card three weeks ago and has yet to ship a single part. They will likely be the subject of another post but not till I receive my parts. Words like yours re-establish our faith in others.
1951 Chevy Styleline Deluxe 2 door sedan / purchased from second owner 6-19-2000.
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