Setting the Stage
You'll also note the huge bottom-end girdle, which came from TA Performance. This is standard fare on Buicks making over 600 horses, and keeps the two-bolt main bearings stable under pressure. The block oil passages have been enlarged from the primary feed port up to the cam/lifter galley. Also, the oil passage from the main galley manifold to the main bearings has been cleaned out and smoothed as much as possible to aid lubricant flow.
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