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Valve Adjustment on modified engine

Engine

Model: 911, Year:1988, Mileage:16,000, Type of use:Both Street & Track
In 2011 I acquired a 1988 911 that was rebuilt by TRG in 2006 for PCA racing class F. The rules require the car to be mostly stock. The engine was modified by JWE and has Mahle piston and cylinders with a 10.3:1 compression ratio. It had a JWE valve spring kit, but in 2010 the car had the valves, springs, and guides replaced back to stock. It is (past) time for a valve adjustment I will do on my own. I've done this before on my stock 3.2 Cabriolet. I want to confirm my P213b feeler gauge is still the right one to measure the gap between the valve and the rocker arm and that I am not overlooking anything I might need to do differently than I would on a stock 3.2. I try to do all my own servicing but I am not a mechanic, so thank you in advance for your advice!

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