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Which valve spings?

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Old Jul 15, 2010 | 04:00 PM
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Default Which valve spings?
I'm in the process of picking out some valve springs for my build (twin turbo 402). I'm stuck trying to figure out who makes the best dual springs with good seated spring pressure. What springs are you high hp guys running? I'm currently looking into PAC duals (1521), Comp 921's, and Manley Nexteks. My heads are basically stock other than bigger valves (2.02 & 1.6). I'm not running a very aggressive cam (under a 600 lift).
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Old Jul 15, 2010 | 04:03 PM
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I'm using the 921's. My lift is .624 though.
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Old Jul 15, 2010 | 04:43 PM
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A lot of guys use the gold for 650 plus lift.
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Old Jul 15, 2010 | 06:17 PM
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Originally Posted by robert miller
A lot of guys use the gold for 650 plus lift.
I had the Platinum's before. I want to go with a longer lasting spring this time.
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Old Jul 15, 2010 | 06:20 PM
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My last motor ran a 242/248 .621/.615 on a 111 cam and I used 921's for over two years and 15k miles with no issues.
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Old Jul 17, 2010 | 02:36 PM
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Bump. I'm leaning toward PAC's.
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Old Jul 18, 2010 | 12:24 AM
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Originally Posted by JD_Z28
Bump. I'm leaning toward PAC's.
So am I - 1521 Looks like Lunati/Summit sells them for $225.
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Old Jul 18, 2010 | 03:09 PM
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Originally Posted by TurboS10
So am I - 1521 Looks like Lunati/Summit sells them for $225.
That's cheap.
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Old Jul 18, 2010 | 06:30 PM
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It's not nitrided like the 1521 is. It's like a 1221 w/1521 specs
p/n 73925K1Lun.
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Old Jul 19, 2010 | 11:02 AM
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Ed Curtis put PAC 1221's on my new heads.
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Old Jul 19, 2010 | 09:55 PM
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A post by Ed is how I found these. Can't find info on the net yet. Finally noticed an ad for them in a magazine.
From Ed:
Lunati Dual Valve Springs
1.306” Outside Diameter
.676” Inside Diameter
153# at 1.810”
400# at 1.150”
.660” Lift Capable
Chromemoly Steel Retainers
Hardened Valve Locks
Hardened & Machined Locators
Steel Shell Viton Valve Seals

springs only
73925K1LUN
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Old Oct 18, 2010 | 11:34 PM
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^^^I bought a set of these.
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