Newman are suggesting that I use their Valve Springs, which are the same poundage as Standard Ford ones.

EVERYONE else says that Standard Ford Springs won't be up to revving to 7k.

Anyone else got any opinions on this?

 

I have always understood, that the #1 problem with std springs was not the poundage, but the bottoming out. Many aftermarket springs are therefore made of thinner wire and have actually less poundage.
Having said that, all clever people have always suggested double springs (from pumaracing?) for serious CVH engines.

 

Pretty sure it was Newman Double Valve springs in mine Christian.

I'll find out for sure this afternoon and let you know this evening.

 

Using worng springs will fook ya cam

 

i cant see there valve springs being any good if they are the same poundage as standard, i'm using pumaracing double valve spring system with my custom newman cam. even piper and kent springs have there problems what cam are you going for an off the shelf or custom.

 

ive had double springs on mine for years

 

i had pumaraging double valve springs on my old zvh xr3i and had absolutely no probs at 7k!

 

valve bounce is all caused by resonant frequencies and all sorts, not just poundage. the design of the spring can make a difference.

double springs is the ebst option mate, the two springs have different resonant frequencies, so when one is trying to cause the valve to bounce, the other is keeping it closed....basiclly

 

i used kent double valve springs with alloy retainers and a bit of machinging.

worked very well, being bounced off a 7250 limit

 

I know it's an old post but where is best place to get the double springs nowadays.?

 

https://www.burtonpower.com/kent-cam...plex-vs42.html

 

Newman direct .