dual valve springs

[Alan Roehrich]

Originally Posted by Jody Lang

And you're only getting 35-40 runs out of the Nexteks?

I was told by a reputable Class engine builder that some have had problems with the doubles.

I had a set of those fail Manley NexTek springs pretty quickly. The engine had about 22 dyno pulls, and 25 passes on it. In fact, I'm not sure those springs were ever really controlling my valvetrain. The cam was not even close to radical. No expense was spared in building the lightest and best possible legal valvetrain, either. There was not a used piece in it, all the valvespring parts were new from Manley bought as a package at their suggestion. New Ferrea valves, new T&D rockers, and new Trend 7/16" x 0.165" wall pushrods, new Comp Endure-X lifters. The geometry was set up and verified by a Super Stock cylinder head specialist with 50 years experience. The failure ended the season, and did about $3K damage. I had run a set of Comp 26000 series springs the year before, for 50 passes or so, plus a dozen dyno pulls, and despite breaking a couple of inner springs, the rest of the valvetrain was fine.