Featured 1977 T140 Rebuild

If the std phosphor bronze type they should be a std interference fit and all the same size some may require internal reaming for the correct valve to guide clearance and some not.

 

Jim, make sure the guides haven't got any carbon on them as it'll scratch the bore as you take the guides out. Boil the head (it needs to be 100 degrees C) or get permission to heat it up in the oven as it gets a bit smelly. Then knock the guides out with a drift. You can buy a special tool or make up your own.
The new guides will need to be an interference fit so get the holes or assuming the existing guides are a good fit measured, or both. Order up your new guides for inlet and exhaust at the size needed.
Heat up your head, freeze the guides and hammer them in. You should pull them in using the special puller from the valve side as it pulls them square but I bash 'em in with a large hammer and a made up drift.
Have a look here for the cheapskate method that I use:



Take some photos as you do it, will be a good reference as I haven't got any to do in the forseeable.

Nice welding by the way

 

Jim, hoping all is well. How's it coming along? Painted yet?