Engine block, align honing:



Align honing is the best method for precision alignment of main bearing bores.
 Promar uses the Sunnen CH-100 machine for all of its benefits and features,
as we can minimize stock removal, usually less than .003" (.076 mm) off
the caps compared to as much as .010" (.254 mm) with boring.

 
Use of this machine maximizes precision and corrects distortion
caused by warpage and cap stretch.
This align hone procedure exceeds original factory accuracy for alignment,
roundness and size and precedes the engine boring process.