110×2.5mm Green Viton ORings for Porsche 996 997 Turbo

110×2.5mm Green Viton ORings for Porsche 996 997 Turbo

What are these for?

• These fit the top of your cylinder liners to seal the liner to the liner carrier
• They seal out the coolant to the head gasket area

Why is Viton better than OEM Rubber O-ring material?

• Viton has a much higher temperature rating than rubber.
• The working temperature range of Viton is considered to be -26°C to +205°/230°C (-15°F to +400°/440°F). But for short working periods it will take even higher temperatures.
• It doesn’t harden, crack and leak like OEM rubber O-rings to do.
• It has much higher resistance to chemicals, especially fuels, oils and various antifreezes.

Will these fit my modified 996 and 997.1 Turbo engine?

• In general, yes.  Even our 103.6 pistons and cylinders for the 4.1L builds use these o-rings.
• If running larger diameter cylinders, please check with your supplier for the O-ring sizes being used.

How many do I need to order?

• This sale is for a set of 12 O-rings for your 6 cylinder Porsche 996 Turbo, 997.1 Turbo or GT3
• Order quantity of 1 to receive a set of 12 O-rings

Part# cross references:

• 999 707 394 40, 999-707-394-40, 999.707.394.40, 99970739440
• O-ring 110,00 x 2,50, O-ring 110.00 x 2.50
• FKM / FPM

Where can I learn more about Porsches?

• Check out Protomotive’s YouTube Channel!

Engines these will fit:

• 2001-2005 Porsche 996 Turbo / GT2
• 2007-2009 Porsche 997.1 Turbo / GT2
• 2010-2013 Porsche 997 GT2RS (9770)
• 2003-2005 Porsche 996 GT3 3.6 and 3.8L (9676, 9679)
• 2007-2011 Porsche 997 GT3 3.6, 3.8 and 4.0 (9776, 9777, 9774)