u20 valve stem seals and alternatives

[70MTRoadster]

I've come into possession of a 1969 SU U20/5 sp. combo with 67,000 original miles on it, pulled for and SR swap. It had been sitting in the car since the early 80's. Long story short, I am at the point of replacing the valve stem seals since they "must" be tired after sitting so long. I can just replace with original stuff from Rallye. Dean sells newer design "better" ones but I don't want to have to have a machine shop be involved to use them. Has anyone done/tried other alternatives that will work without any machine work being done to the head? On my 1600 510 engine I was able to use Ford V6 seals that stopped the smoking at start up of the old, hardened, tired original seals. Anybody? Thanks, Scott

[C.Costine]

I wouldn't put a head back on without it being at least checked by my machine shop.

[Mike Unger]

Your L-16 (510 engine) has guides to accept snap press on valve seals that are typical for many engines. The stock U-20 is set up for the "hat style" seals that are held in place by the valve springs. They function as a valve spring seat and a valve seal.

Trying to delete the additional posts but can't seem to do it, sorry.

[70MTRoadster]

OK, thanks for the info. I'll just replace with same kind "new" ones then.

[nismou20]

They can be replaced without pulling the head.

[Linda]

The 1600 uses the “hat” type valve seals, which are available as a H20 forklift part, but I don’t know what a U20: uses. New seals can make a big difference though.
Linda