Thread: Valve Springs

Anyone have any experience with Franklin's valve springs?? How do they compare with SuperTech & BC?? I'm not sure which ones to go with but I'm leaning towards the Supertech or Franklin simply because a local who was revving to 9200 with N1's floated a valve. Any thoughts on which ones would be the better of the 3 or would all of them float valves at that RPM?

Floated a valve on what...stock valve springs? BC will take 9K plus no problem, and Im sure a bunch of guys using them will chime in & say so.

What about N1 springs?

I donn't think stock N1 Valve springs will rev to 9K plus for very long......I think?
Maybe 8500rpm, but why not just grab the super techs, BC's or whatever else is out there.

If your thinking of getting supertech they have 2 options. 100lbs or 130lbs on the seat. I dunno if the 130lb would rob any power if your car isn't built.

I believe I have the 100lbs in my car since I just have bolt ons and they seem to hold well.

YEP! I have hit 9k + a few times with no hick ups but my buddies car floated. So since I drive crazy and seem to hit 91-9500 sometimes I need some insurance. Plus I may end up with cams that make power at those rpms so I might as well do it the correct way

They are all good, price is the only thing separating them. I forgot which but either the Supertech or BC springs are larger in diameter than the stock retainer. They kind of bulge out.

I think you would be ok with the BC springs.I think if you get the spring get the retainers to so theres no problem with the spring bulging out. I know Id feel safer having all BC parts in my head

Ive used BC springs with stock retainers 9K redline on N1's with no problems. I know a friend locally revs his setup 9.5K with just BC valve springs & it sees that daily.

The BC springs still bulge out, even with the BC retainers.