Head Springs

[egspot]

At what point would (CB 044 Heads, cut for 90.5  cylinders, valves 40 x 35.5)dual valve springs would be adequate?
Is there any requirements that I may have to fulfill in order to use and benefit from the dual springs For a daily driven ( i.e. stroker crankshaft, pistons displacement, cam size, muffler, carburation?)
 

[dannyboy]

i beleive its a combination of things, but mostly rpm, and valvetrain weight...
just go with the duals, the cb heads should already be cut for them, and then you never have to think about it again
but thats just dannys opinion
 

[Matt Davis]

The big thing I look at is cam and rpm desired to run the engine at.

[Bruce]

IMO, you must use dual springs.  You can use the softest duals on the market.

Your valves are heavier than stock.  You need more spring.
Your cam has more lift and duration, you need more spring.
Your rpms will be higher than stock, you need more spring.

To make everything in your valvetrain dead reliable, you need Aircooled.net aluminum pushrods, or the thinest (lightest) chromoly steel pushrods.  
You need swivel foot adjusters.  I like the ones with the big foot, not the ones with the steel ball that has a flat ground on it.
You need a solid rocker shaft kit.
You need machined chromoly retainers (included with the CB heads)
You need some kind of hardened steel shim under each spring to prevent the spring from cutting into the soft aluminum.