Technical Tips > Engines - Carbies - Exhausts - Dissys

Exhaust Popping?

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bfit:
11 - 28 - 93  looks like a us date format

The other number , ?
TR  Trace roller series
250/400  the grind  series
2 duration at 0.200’’ lift
6   GROSS VALVE LIFT WITH ZERO LASH AT THEORETICAL ROCKER RATIO  AT 0.600’’
Bfit

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