JD_Z28

iTrader: (19)

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).

TurboAv

iTrader: (6)

I'm using the 921's. My lift is .624 though.

robert miller

A lot of guys use the gold for 650 plus lift.

JD_Z28

iTrader: (19)

I had the Platinum's before. I want to go with a longer lasting spring this time.

TurboAv

iTrader: (6)

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.

JD_Z28

iTrader: (19)

Bump. I'm leaning toward PAC's.

TurboS10

iTrader: (12)

So am I - 1521 Looks like Lunati/Summit sells them for $225.

JD_Z28

iTrader: (19)

That's cheap.

TurboS10

iTrader: (12)

It's not nitrided like the 1521 is. It's like a 1221 w/1521 specs
p/n 73925K1Lun.

ss1

iTrader: (32)

Ed Curtis put PAC 1221's on my new heads.

TurboS10

iTrader: (12)

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

01ssreda4

iTrader: (96)

^^^I bought a set of these.