Porsche 997 Turbo
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Turbo (Turbo, TurboS, GT2)
Engine Upgrades (Internal)
EVOMS "Hellfire" Head Gasket Set
Head Gasket Bore:
102mm - for 100mm Piston
104mm - for 102.6mm Piston
Our proprietary head gaskets were developed to handle increased cylinder pressures and more extreme boost conditions and heat. A typical OEM head gasket failure typically only occurs under extreme conditions however, we have seen some higher mileage 996TT engines with signs of head gasket seepage which is usually the first signs of eminent failure. This failure is due to inadequate head torque provided by OEM head studs as well as head gasket fatigue. The OEM head gasket is a 3 layer stainless gasket that is a good design however, our similarly designed 3 layer design offers benefits well beyond the OEM gasket.
Stronger direct replacement head gasket
3-Layer design like the OEM gasket with a stronger stainless steel center
20/1000” thicker which reduces compression be .2 tenths of a point
Allows for proper valve clearances when using higher lift exhaust camshafts
The outer layers of our gasket are embossed and coated on both sides with a flouroelastomer rubber based material (Viton) which is designed to meet the demands of a variety of harsh sealing environments, load conditions and surface finishes. The Viton coating is heat resistant to 250 C or 482 F. The center shim layer is a uncoated stainless steel layer which is nearly 5 times stronger than the OEM center stainless layer. This is a key element to our gasket design which will prevent the typical blow out of the center layer of the OEM gasket. Our head gasket design promotes an even torque load across the sealing surface allowing for measurable reduced bore dissertation and a stronger seal between the head and cylinder.
102mm Bore* - Compatible with factory pistons or EVOMS 100mm Pistons
104mm Bore* - Compatible with EVOMS 102.6mm Pistons
*All gaskets are compatible with 10mm and 12mm head studs
*All gaskets are 0.040" thick
EVO High Pressure Head Gasket Kit includes
EVO Engineered High Pressure Head Gaskets (2)
Instructions w/ EVO Designed Head Torque Sequence
• Pricing subject to change without notice.
EVOMS 3.8L Rotating Assembly
EVOMS Piston & Cylinder Set
EVOMS Piston Set
EVOMS Turbo Camshafts
EVOMS 10mm Head Stud Kit
EVOMS Lightweight Billet Crankshaft
EVOMS Connecting Rods
EVOMS GT/EVT Series Double Platinum Spark Plugs
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