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View Full Version : are stock sc valve springs dual valve springs?



fordemt
11-23-2010, 04:37 PM
About to finally finish this hg swap and went to change valve seals. The springs are dual. Is this stock?

the-big-e
11-23-2010, 04:56 PM
Yes, every SC head in my shop has dual springs on them....

phils89sc
11-23-2010, 04:59 PM
Are they true dual springs or a single spring with a damper spring in the center?

the-big-e
11-23-2010, 05:08 PM
Dag nabit....

I just put up 3 sets of heads this morning into my parts collection....

I'm sticking to dual springs.....:p

rzimmerl
11-23-2010, 05:51 PM
They are singles with a dampner.

the-big-e
11-23-2010, 07:17 PM
I guess I'll need glasses now.....:rolleyes:

XxSlowpokexX
11-23-2010, 08:00 PM
single with dampner...ND THEY ARE JUNK JUNK JUNK!!! hehe

XR7 Dave
11-23-2010, 08:09 PM
A damper does not constitute a dual spring. Dual springs have 2 real live springs in them, and some have 2 real spring + a damper in between. You can't run dual springs on a stock SC head without modification because the spring seats are not wide enough to accept 2 springs.

Stock springs have about 80psi seat pressure. A decent aftermarket single spring will have about 120psi seat pressure. A dual spring worth it's weight will have about 150psi seat pressure.

90coug
11-24-2010, 05:20 PM
A damper does not constitute a dual spring. Dual springs have 2 real live springs in them, and some have 2 real spring + a damper in between. You can't run dual springs on a stock SC head without modification because the spring seats are not wide enough to accept 2 springs.

Stock springs have about 80psi seat pressure. A decent aftermarket single spring will have about 120psi seat pressure. A dual spring worth it's weight will have about 150psi seat pressure.

What's the seat pressure on the the beehive?

XR7 Dave
11-25-2010, 12:13 AM
There are several different beehive springs, and seat pressure depends on how they are installed. The ones I recommended for you will have 135-140 but beehive springs don't require as much seat pressure due to reduced reciprocating mass.