vroom1776 wrote on 12/31/69 at 16:00:09:What the heck is a blueprinted engine?
Nopody's berfect.
The blueprints contain all the dimensions of the parts. Since noone is perfect, the dimensions are all given with a tolerance. The piston may be listed as 94mm plus/minus 0.1mm. This little bit of slop allows cheaper manufacturing, but you lose a tiny amount of performance.
A blueprinted engine is built zero tolerance, or as close as humanly possible. Each and every part is carefully measured and selected or machined to be right at the specification.
Crazy people blueprint engines. The time and money involved is insane for the small performance increase. Being sane is not as much fun.