You can assume that. But some that are close you have to just I stall them and see. The .381 is a good starting point, but these are castings. Each casting may have a few thousandths ( or more?) of variation on the non machined surfaces. Its cheaper to cast the part and machine down your tolerances then to have those tolerances built into the initial cast.
2001 ZX3 Zetec - Rebuild "The TICK" (
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2004 ZX5 SVT - Restoration "Code Name Rocket" (http://www.focusfanatics.com/forum/showthread.php?t=722698&referrerid=62897)