Re: valve guide failure

Posted by Owen_Dyneto On 2012/10/20 18:05:51

No need to be dainty when removing the old guides (and they can be a PITA), but to avoid damaging new guides when installing I usually like to pack them in dry ice for a few minutes. Wear a good glove to avoid frostbite but then you can just push them in with your fingers. After they return to ambient temperature I run a properly sized ream thru them though the guides I've bought most recently from Kanter and Egge were sized perfectly as installed.

On some engines the intake and exhaust guides are driven in to different depths below the block surface so it's always important to measure that before removing the old ones.