Review on Percys 66124 Header Flange Gasket by George Utley
They fit 8.1 liter big blocks
Although the description says they don't fit in 496 8.1 liter blocks. Yes, and I just installed it on a 2001 Sierra HD 2500. My exhaust leak is gone and they seal perfectly which my reflex seals didn't. BTW, you can reuse them, and the reflex I removed is complete garbage. Percy's is the way to go for everything and has been happy with all the different uses.
- High marks for support and durability from testers
- Poorly thought out
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