[Mike S]

I am building a fresh mild 400 for my street car. I am using the 6x heads I had on the 455 that was in it. Heads were done more than 25 years ago. Had new valves, springs and seal along with milling them to 90cc. Car was mainly raced and has been sitting more than running for the last 15 years. I want to replace the seals. It looks like the guides where cut to .560 for the seals. I can't find a cat. number on the old ones. Does anyone make a seal that will fit on a .560 guide?
I had a couple from my e-heads laying around and they won't fit.

[Cliff R]

Yes, they came right up in a Google search from several different sellers. .500 and .530" seem to be more common, my cutter here cuts for the .500" seals nearly as I can remember......

https://www.libertyperformance.com/p...-diameter-659/

[25stevem]

.560" is the stock guide OD and they will not accept any type of positive type seal like you should be running.

For street springs that work with Hydro Cam usage have a shop cut the guides , or get a cutter yourself to chuck in a drill and cut the guides to .530" and then get a package of seals PEP-343530-16 from Butler.

This then will allow you to do away with the stock oil splash sheild and the valve stem O-ring seal.

Most of the good new valves these days do not have the needed second stem groove for the O-Ring anyway.

Use a tall 1/4" drive socket that fits the steel part of the seal well to push them on after lubing the guide tops well, or there are plastic installers that can be had to do the same.

When I use I socket for this I put two layers of electrical tape around the lip to not harm the seal.

[Half-Inch Stud]

Definitly buy the valve guide cutter. PMD Iron valveguides cuts/chips suprisingly well. Knock top edges to help Valve seal install.

[Mike S]

Ended up dropping heads off to the machine shop, A few of the valves had a lot of play in the guide. They are going to freshen them up. Figured might as well put fresh heads on a fresh short block,