Im looking at using smaller springs and retainers
for this particular head so I can angle and enlarge
the ports further. Im looking at 3-5mm less overall.
Can anyone advise if this is possible using smaller
diamter dble or triples valve springs?

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bump

anything spring to mind?

Doesn't look as if anyone is springing into action here...

maybe try finding an off the shelf srping set then get retainers made ?

wouldnt be too deer ,if you got for doubles ,then theres less machine work beened

if you angle the valves wont the springs try to lean aswell ? or is that why your going for small springs ?

good luck !

yeah trying 2 miss the springs with extra porting, no springs would b best ;0

Im going to weld up the spring base area so just wondering
if anyone knows of a small diameter double valve spring
and retainer I could use from another nissan engine?
Im sure the L series ones are just as big wont be any good.
Im going to use larger in/ex valves so need to be steady
enough as well to support bigger valves.