I have a T block that has previously been ported and will need larger head valves with stems that are .030 OS. I am looking for valve head of approximately 1.625". I am open to suggestions and direction from those who have solved this type of problem. Help is greatly appreciated. Thanks. JP

Jack, I think that in the era, some used modified Fordson tractor or Dodge valves. I talks about in in Model T Speed and Sport book.

Small block chebby exhaust valves come in an array of sizes. 1.600 happens to be a very common size. They also have 11/32" stems, which is 1/32" O/S. I run 1.720" and 1.600" chebby valves in my flat T. There are a few standard chebby lengths available, as also are +.100" and +.200" lengths. Measure an ol' T valve and Google the Manley Valve catalog, they should have anything you need on the shelf

351 windsor is a bit larger and you can get them wit h the right stem size. Scott

From Rockauto, You can get some EngineTech Ford 351 Clevland exhaust valves that have the specs as shown below.

Part# V1765
Stem Diameter: .3415"
Valve head: 1.654"
Keeper Grooves 4
Notes Chrome Stem
Stem Diameter 11/32
Valve Length 5.051

You then can use Ford Tractor 9N valve retainers with a stock style Model T spring with the proper modern valve retainers to match the valves.

I have not actually used that part# valve, but I have used part# V1761 (351 Windsor) and the matching single groove keepers with the 9 N retainers.

It appears other than the number of grooves for the keepers and the head diameters, the valves are essentially the same. I have used the V1761 with stock Model T lifters as the valves are very close to the stock length T valves. The larger head diameter V1765 should be in the same boat, but are .024" shorter---probably would be better with adjustable lifters I would think.

Thanks for all the input. It really gives me direction and help to solve a problem.

Jack I am sure you will know this, but for others, be sure to check your clearances if using a stock head (maybe others too) and gasket when going to larger head on valves. There is a point were if the valve head is too large it will hit the gasket and or inside of the combustion chamber.

Mark, thank you for adding that. I was going to mention that and forgot.

I also wanted to mention that the valve stem clearance should also be checked. I have a .343" reamer to double check that and relieve any tight spots on the guides.