Need some advice on valve guides, reaming and clearance.
I'll be fitting cast iron valve guides and understand the ID is 9/32 or 7.14mm, is this before or after reaming?
If reaming (and I have found some info suggesting that cast iron guides don't get reamed), what size reamer do I need and where can I get one?
I understand from searching on here that the clearance should be 0.012"
Many thanks