Which Valve Springs?

[dustUoff]

What is a good single spring that would handle about .515" of lift? Lunati recommends a double spring for my new cam, but i'd like to stick with a single spring so I don't have to have my heads machined.

 

[moturbopar]

hughes 1110

 

[412 Stroker]

These are what I have in mine:
http://www.jegs.com/i/Comp+Cams/249/901-16/10002/-1
and I have a Comp Cams Thumper cam. with the 1.6 rockers I have it come out to about the same as what you have, I think as long as you don't rev too high you and I should be ok, maybe someone else can chime in.

 

[crackedback]

901-16 should work, just shim them up a bit for a little more seat pressure.

I use a similar spring on a .528 mechanical.

 

[voodoo1]

I'm looking also. So many to choose my head is spinning. Is the Jegs spring good enough for a 509 cam? Will they fit without any head work?

 

[moturbopar]

The hughes have almost identical specs as the lunati dual springs. The comp 901s are a little soft but with shimming they might work just fine.

 

[dustUoff]

Ok, 412 Stroker or Crackedback, what size shims do you think I would need? Stroker, are you using shims with your set up, and if so do you have a part number? Thanks!

 

[412 Stroker]

Ok, 412 Stroker or Crackedback, what size shims do you think I would need? Stroker, are you using shims with your set up, and if so do you have a part number? Thanks!

I dont think I have any shims in mine, I had a machine shop do them and they didnt charge me for any shims, and they charge for everything.

 

[RustyRatRod]

The 901s will work great. Inexpensive and effective.

 

[dustUoff]

Ordered my 901's yesterday! Thanks for the info guys.