Posted for "George Braly" <gwbraly@gami.com>:

 
 If your TSIO-550 has 7.5: 1  compression ratio,
 
 AND your  CHTs are at or below 400F,
 
 You can safely do the BMP at any MP at or below 34" to 35".
 
 Regards,  George
 
 

"""
 What is the maximum manifold pressure at which one may perform the "big
 pull" (go LOP)?
"""