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Author Topic:   valve spring ?
BK19
Member
posted March 21, 2004 07:11 PM
will z-28 springs handle a cam with a 5.30 intake and a 5.42 exhaust valve lift?


KPLugnut
Member
posted March 21, 2004 07:47 PM
no, and if they do, it won't be for very long or at any rpm much over 4500-5000.

There are very reasonably price stock diameter springs available that will handle that cam, tho.

They're available thru many suppliers (we have 'em, as well as other forum sponsors I'm sure).

KP


race33
Member
posted April 01, 2004 11:07 AM
quote:
Originally posted by race33:
I bought the Z28 springs and they are only rated for .510 lift max.

And that's on a good day.



dirtbuster
Member
posted April 01, 2004 04:06 PM
I wouldnt run them past 480 lift myself. Like KP mentioned there are better springs out there.


loosewheel
Member
posted April 01, 2004 07:45 PM
Valve springs are an area where quality is far more important than price.


Dixon
Member
posted April 02, 2004 09:25 AM
One thing that really bothers me is how some of these parts dealers (specifically catalogs) that advertise certain springs that are capable of lifts well over what they can really do. I can think of several that list the Z-28 springs as being capable of .525" lift, and that's just false advertising.


dirtbuster
Member
posted April 02, 2004 02:41 PM
I think some of it has to do with the fact that many people generically think of a drop in stock diameter high performance spring as a 'Z' spring so the retailers promote them that way. It may be true that some so called 'Z' springs will take that much lift but not a true z28 spring. I wouldn't try it either way.


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