Valves

[3W Hank]

I checking out valves to my Merc 41 block with a 425 E cam and a 8AB lifter ( 44 grams )
My idea is has a light valve.
This block has a nice ported runners done way in the past by a pro porter, from what I heard it was done in LA and the guy I bought it from had it for ca 30 years.
But it has the std 1.5” seats and I will keep it at 1.5”, and not go 1.6”.
I will make own new 1 piece guides in bronze and 8 mm or 5/16” stem.
I has Iskys springs and I did like to talk to the man last year when I was in LA but Mr Isky had just went home.
Ides of question is those springs is made for his .400 cam and not the .425, so it get maybe a higher pressuare.

Titanium sounds way out maybe… well I has a buddy that can get me a longer 2” used sets for free but I need cut them and make grooves and set them at the diameter 1.5” and from what I heard the CSB exhaust lenghts is 4.92” (?)
Actually titanium sets is not expensive ( used ) on eBay.
Good is super light or half weight from steel, and maybe in this aplication at ca 45 grams.

-But to make it more simple, what good flow, thin head 1.5” in stainess is to be used ?
Manleys, Ferrera, or Del West etc.

Will the std CSB lenghts ( 4.92” ) works.
I’m not there in mock-up yet to see the lenghts.
But I’m aware as I will not use adjustable lifters to cut lenghts on valve ( the old way )
-Just try seek info sort the way.