Mk3 Valve seat work at home shop

Valve seat cutting at home shop never seemed cost effective as the tooling was too expensive.
I am refreshing a Mk3 head and now see a less than $50 valve seat cutting set.

Any one used this new plastic material set?

Yes , I have heard about 60/45/15 and this set is only 45/20.

Also I need a video on vale guide replacement specifically for Mk3 delicate head, prone to cracking......or maybe more in depth instructions on this guide remove replace.

This set is on amazon.

If you have to ask how to fit the guides correctly maybe take it to a automachinist, it depends how they felt (tightness) when you took them out of a hot head , this helps you decide how much to add to the guide OD if any , if your heads been around the block , no pun intended , it could already have oversize guides .. Dont hammer your guides in , press them in with a hand type fly press or that triumph style guide puller , with a little coppercote . . Maybe those plastic cutters are ok for a few jobs , just learn how to blue your valves in and set your seat position ⅓ down ⅔ up on "the valves seat face while getting your desired seat width , too wide won't cut the carbon . You can also vacuum test your valves sealing ability.

With a MK3 head so prone to cracking even a good machinist could have it happen, I would get the current guides relined instead.

K-liners are good to , I was going to add that but forgot , Cheers.

Had a search for the Carbide cutters, they are made in India and with the slow speed of cutting the equidistant blades will be prone to chatter. To get rid of the chatter you would then need another cut using a different speed and pressure by experimentation until the cut is chatter free. So with Indian quality being suspect at times plus the risk of chatter I would stick with the Neway carbide cutters, these have staggered carbide blades which are replaceable or if that is too expensive then get a machinist to cut the seats.

I'm fairly well sorted in my my shop to do guide work and seat cutting, I would not use those cutters for my first attempt, nor would I try it on a MKIII head. FWIW this is how guides ought to be removed: https://www.accessnorton.com/NortonCommando/a65-teardown.35101/post-579746

What size Neway cutter is used on a Mk3 head 45' valve seats?
Valve specs are Mk3.




https://www.accessnorton.com/NortonCommando/cutting-your-own-valve-seats.36778/#post-616594