SBC heads with weird valve seals
I bought a 1986 GMC K15 which has a mexican reproduction 350 which was rebuild recently
after inspecting the heads I found no valve seals and they won't accept regular 350 valve seals
I've tried many types and I found a set of stock 454 Umbrella style seals that fits perfictly
but after mounting the springs I found that they touch the seals even when uncompressed
what should I do ?
Replace the springs with something bigger ( wider ) ? stock? aftermarket?
try other seals ?
Regular 350 SBC valve seals are just "O" rings. The umbrella type seal you show usually requies the valve stem boss to be machined.
most 350s I have seen have both O-rings + umbrellas
this engine only have the O-rings but it is burning some oil
so is it enough to use the O-rings only ?
positive stop viton seals is what most engine builders recommend,
summit has them and shows a picture of them.
The stock o rings will work fine if the stock oil sheild is there. You have to compress the spring then install the o'ring then the locks. If you put the o'rings on first they won't work.
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