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Gen 1 EGR Exhaust matifold thread size.
- Thread starter cobra mk8
- Start date
Right on the Mark
Dedicated LVC Member
From my header thread
There is no such thing as (1.0625)1 1/16-13 so I'm guessing its really(1.0629) 27mmx2.0 thread. I have no metric tap and dies that big. Thread gauges showed me the 2.0 metric pitch looks same as american 13 TPI count. So I made it 1 1/16-13 sence my lathe cannot cut metric threads. I had to single point these threads on lathe. Here I am measuring the stock threads using the "3 wire" way. I am not taking the EGR tube off engine so I cannot use it as a fitment guide. Thats why 3 wire way.
There is no such thing as (1.0625)1 1/16-13 so I'm guessing its really(1.0629) 27mmx2.0 thread. I have no metric tap and dies that big. Thread gauges showed me the 2.0 metric pitch looks same as american 13 TPI count. So I made it 1 1/16-13 sence my lathe cannot cut metric threads. I had to single point these threads on lathe. Here I am measuring the stock threads using the "3 wire" way. I am not taking the EGR tube off engine so I cannot use it as a fitment guide. Thats why 3 wire way.