Hi Guys,

I want to replace the umbrella valves seals with positive seals and trim the valve guide down for future possibility of a higher lift cam. Just wondering if anyone knows a source to buy valve guide cutter, what size is required and also what positive seals I can use?
(It more hassle than its worth at the local machine shop- if you know what I mean)


Thanks, Dennis.

56 F100 - 272 Y Block
NSW, Australia.