To measure your parts yourself the tool list:
1-2" micrometer with .0001 resolution
2-3" micrometer with .0001 resolution
3-4" dial bore gage with .0001 resolution or manual bore gage with a 3-4" micrometer.
a feeler gage
green plastigage or better the real stuff spelled plastigauge (harder to find)

if you don't want to measure anything, you can just get by with the plastigage.