Click on image to zoom

MTM963-103 - Mast Motorsports LS3 SS Camshaft and Spring Package

This product may require vehicle validation(s) for proper fitment. Please contact us to confirm correct vehicle fitment and usage.

Availability: Item has been discontinued and is no longer available


Mast is THE leader in LS cam technology. Want proof? We had variable valve timing cams 18 months BEFORE anyone in the aftermarket. We design our lobes IN HOUSE using proprietary software. We test each cam on our NCRS Superflow engine dyno in actual applications to find the best power curve. Then, we test each profile in “real world” conditions. After many grueling hours, we select a profile to be manufactured to our precision specs. from select billet cores.

Mast Motorsports cam & valve spring package notes:
• Each package incluedes a Mast dyno proven camshaft PLUS matching Mast premium beehive valve springs
• Mast premium nitrided beehive valve springs are included with Z06, HO & SS cams
• Headers are recommended on every GM Gen IV app. to significantly enhance power improvements from camshaft swap. Mast Motorsports recommends that every cam be accompanied by a calibrated tune using HP Tuners, EFI Live, or equivalent software

Idle Quality: Moderate
Duration @ .050" (In. Ex.): 230/237
Valve Lift (w/1.7 Rocker) (In. Ex.): .609/.615
Lobe Sep. Angle 111
Max Lift: .650
O.D. / I.D.: 1.290"/.885"
Seat Pressure (lbs. / In.): 130 @ 1.800"
Open Pressure (lbs. / In.): 318 @ 1.200"
Coil Bind: 1.080
Spring Rate (lbs.): 313

Application List



  • 963-103
  • 963-103
  • Mast Motorsports
  • Item has been discontinued and is no longer available
  • New


Shipping Information

  • Item Requires Shipping
  • 13.0 lbs.
  • W1.0000” x H1.0000” x L1.0000”

Customer Reviews

Comment Total Reviews (0)

Write the First Review!

You must login to post a review.

Trusted Specialists GM engine & parts specialists
Located in the USA Owned, operated, & employed
Need Assistance? Call us at 888-748-4655
Mon-Thu 8am-6pm EST
Fri 8am-5:30pm EST
Have a Question Email us and we'll get back to you within 24 hours
Pace B2B