PSI Triple Valve Springs Drag Racing

PSI DR 1247ML Max Life Triple Racing Valve Springs

$578.00 Set of 16, Free Shipping

PSI Performance Springs DR-1247-ML is a severe duty valve spring designed for solid roller valvetrain. Works with most aftermarket cylinder heads with 1.660″ OD Triple Springs. These springs have the Max-Life (ML) option which adds a multi-step surface enhancement process that has been proven to increase valve spring endurance.

Type: Triple
Spring OD: 1.660″
Inner ID: .630″
Seat: 340 lbs @ 2.070″
Open: 940 lbs @ 1.270″
Recommended Lift: .800″

SKU: PSI-DR-1247-ML-16 Category: Tags: , ,

Coil Bind (max)1.130″

Part#DR-1247ML (Single Spring)
Alt Part#DR-1247ML-16 (Set of 16)
DescriptionPSI Drag Race 1200 Series Triple Valve Spring
Outside Diameter1.660″
Outer SpringID 1.195″
Middle SpringID .870″
Inner SpringID 0.630″
Install Height2.070″
Load at Installed Height340 lbs
Spring Open Height1.270″
Spring Open Load940 lbs
Recommended Valve Lift0.800″
Spring Rate (lbs/in)750
Retainer Step0.100″

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