What we here at MVP say about these cams:
Buyer beware!
The quality of GSC cams is not the issue, they are very high quality.  The issue is that we (as well as several other very well known Supra shops (can't say who here in writing)) have seen multiple, multiple heads with severely premature bucket wear that are running these cams.  The only solution?  To DLC-coat your buckets at a cost of $500 - that's ridiculous!

There are lots of great cams out there from Brian Crower, Kelford, and Titan (made by Kelford) that we offer that do not cause any premature wear issues.  We highly advise you consider any brand of cams other than GSC (and HKS - their grind profiles are from the 1990's and they make significantly less power than modern cams like the brands mentioned here).


What GSC says about these cams:

GSC Power-Division billet S1 camshafts for the Toyota Supra 2JZ-GTE. The S1 camshafts are designed for those running an upgraded single turbo larger than 57mm. These cams will not have bottom end losses over stock cams on larger turbos; nothing but gains and will promote an extremely flat torque curve.  These camshafts have proven power gains of 40-70 WHP (depending on turbo) with minimal modifications including re-shimming and mild tuning. Due to the added lift and duration these camshafts do require a single valve spring upgrade.

• Designed for a rev range of 3,500-8,000 RPM's
• 500-1,000 WHP camshaft set
• Idle slightly rougher than stock

Applications

• 1993-1998 TOYOTA SUPRA L6 3.0 T 2JZ-GTE NON-VVTi