I recently reamed out the guides (OS, .342) on a 26 and now have discovered that 3 of them are not straight. I was careful to let the reamer do its thing and not lean. The problem is now that the new valves do not sit correctly on the seat. I do have a Sioux seat grinder and tried working on one, and as expected had meat on one side and not quite enough on the other to seat.
Any suggestions on where to go from here?
Take it to a machine shop familiar to Model T's. Maybe they can sleeve it or straighten it out. with oversize valve stems. I don't think you should try anything without some kind of jig which will keep the reamer straight. Norm
You always clean up the guides first and then and only then you can correctly do the seats. It would be cheaper to get new valves with a larger stem and then have them ground to the proper fit.
It depends on how loose they are. You can knurl the holes and then re-ream them and you will get better oiling. because of the places where the oil can rest.
If you use a reamer by hand, the reamer has to have it's own pilot for a guide.
If you use a end reamer, you have to use it in a jig.
The only way it will work now in to take it to a machine shop.
You can't fix a mistake by making another!
You may need to have new seats installed too. After the guide bore and valve seat are corrected, the valve may sit too low. Could have saved both time and money by just taking it to a machine shop in the first place.
If you put in a hard seat to match the tilt of the valve guide you still have a crooked valve. It is pretty simple to set the block up on a mill and ream the hole straight and oversize, put in a Goodson guide and size it for the valve. Then put in a hard seat and grind it and you will be good to go.
Let a machine shop install a set of K liners to true them all up.
Allan from down under.
I'm with Allen on this. I've been having K-lines put in motorcycle heads for years. They are a great invention. Contact the US importer for a shop that has the special equipment in your area. Their URL is: http://www.sbintl.com/ The only question is if a T block can fit where necessary for the installing machine to properly install the guides. Then the machine shop can install seats that aline with the inserts. You will need to take a set of valves with you so they can ream the K-lines to the correct diameter after installation.
Set the block up in a vertical mill and use an end mill to straighten up the valve stem holes. Once the valve stem holes are straight, the holes can then be reamed (Again, Use The Vertical Mill) to fit the new guides.
I think its unlikely a reamer, even in a milling machine can true up a slanted hole. As Les stated, you need an end mill, which will run true and not follow the hole as a reamer would do.
You're right. I should have said, "Mill" the hole straight and oversize instead of "Ream" the hole. A reamer will pretty much follow the hole, an end mill will cut it straight.
Goodson guides are the same thing as K liners, it's a brand name thing. The difference, if there is one, is that Goodson guides can be purchased in different wall thicknesses. Maybe K liners can be, too. I dunno.