92 5.7 valve spring problem

[strike ll]

i have a 1984 welcraft 260aft with a 1992 5.7 mercruiser engine. i broke an intake valve spring on #3 so i want to replace them all. when i looked up the spring part# it looks like it is a single spring. My valve springs have an inner and outer spring for both intake and exhaust. i believe it is a stock 5.7 260hp. does anyone know the correct part#'s for these valve springs. the valve covers have the 4 center bolts

 

[RicardoMarine]

These are nothing more than GM valve springs as far as I know.
If you know the cylinder head casting number, you should be able to find the correct springs.

Since we typically operate at lower rpm than the High Performance automotive counter part......., there's no need for high spring pressures (in case you were wondering).
High spring pressures create more wiping action at the valve stems and standard rocker arms.

 

[bondo]

My valve springs have an inner and outer spring for both intake and exhaust.

Nope,... No ya don't,... It's a single Spring, 'n an inner dampener...