12/1 Lovson listeroid valve guides difference

[Maxjasper]

I am replacing valve guides on my stock 12/1 Lovson listeroid. I have seen some posts on here about valve guides especially about lubrication (splash and splash with holes in the guides). The valves that I am replacing have the lubrication hole just within the recess of the lubricant well directly under the springs. The intake and exhaust are about 3/16 different in total length (3-1/16 and 3-1/4) and protrude at the bottom into the chamber about 3/8th of an inch each.  The ones that I have in one of my rebuild kits from I think from  central Maine diesel don’t have the lube holes and are longer in length (3-5/8 and 4-1/4).  The new ones would protrude into the chambers roughly 1/2” longer on the intake and 3/4” on the exhaust.  The exhaust is also bored out about 3/4 of a of an inch on the bottom side beyond where the valve slides.The new ones also will be protruding from the seat roughly 1/8 more on the intake and 1/4” on the exhaust.  I will attempt to send a photo. They seem to want to easily slide in to be pressed.

But what I am asking, of course, is this variant common and will these replacements be an issue? Has anybody run into this with the commonly available set of valve guides or is there a supplier of valve guides closer to original that I need to find?

[Maxjasper]

Some photos

[38ac]

There are at least 6 variations in India valve guides. The shortest ones are for the direct injection engines. Then there are middle length guides of several lengths then the long ones that are a comparable to what Lister used. Do not use guides that are shorter than the bore in the head, other than that I have used the various lengths with no issues. No matter which guides you use plug the holes in the side which is a stupid India modification that drains the mine wells in a out 5 minutes. Another big issue is clearances. India seems to use 7/16" (.437) and 11mm (.433) as interchangeable. Most new guides are 7/16 about half the valves are 11mm creating much slop

[Maxjasper]

Thank you so much. The replacements ride really nice with no slop.  I was wondering about that slop as I have three heads with valve guides that have the holes and are original form India. They all have just a tiny slop where as the new ones in the photos I posted seem to have no slop. The new valve guides will protrude from the bore in the head 1/2” to 3/4”. Hopefully that is fine as you said. Again thank you!!