Need something that handles .675" lift. This car isn't a daily driver, but I would like to get at least 10K miles out of them. The biggest concern is durability.

The Comp 943's look nice, but are kinda pricey. Even more so for some Isky's or PSI's. But unfortunately, money IS an object.

K-Motion are a fraction of a cost of the others, but there have been numerous reports of breakage in the past. Not much feedback recently as far as these issues being resolved though.

Any other options?

 

I'm running comp 946's

 

Sorry but valvesprings are one thing you shouldn't skimp on. I've run Comp, Crane, K-Motion and quite a few others but the best I've found for durability and consistency are Isky's toolroom springs. For what you're doing, the 9375/85 Plus or maybe 9385 Plus would be the best bet. Lighter valves... go with the 9375/85.... heavier (Extreme duty type) valves, go with the 9385's. PSI also makes a good spring... well worth the money but I like the Isky lineup for springs.
You'll also get quite a bit more life if you use a valve cover with spring oilers... either that or build some spring oilers. Well worth the effort at this level.

-Mindgame

 

Thanks for the help.