Those are both Deere motors but different years but thats all i can tell you since i am not that familiar with the Deere applications

The 4/6 and 81,82 LTD used the same rings as the JD rings part AM54849 or kawasaki number 13008-3008 you can get an oem replacement yet from Dk http://www.denniskirk.com/jsp/product_catalog/Product.jsp?skuId=&store=Main&catId=&productId=p13848R&leafCatId=&mmyId=7435 Not all of th...

See you guys there i will be swapping so stop by an say hi

It is a yamaha apex turbo

Center Seal O Rings: Kawasaki pn# 92055-3002, Arctic Cat pn# 3001-437

150 main and 120 powerjet would be stock

Cool pics!!
The company i work for hauls a lot of those around.

Isn't the whole "help Bob" thing a bit harsh?

Here is an Invader VS Liquifire comparison that should help you

For starters make sure you peel all that old silicon crap off of those gaskets and use some fresh stuff but only a very thin layer. Then get rid of the acorn nuts and go get some 6mm nuts so you dont have to worry about bottoming out in the acorns when you try to torque the heads.

The ring pin position is different on the 4/6 versus invader motor and they used the same rings as the 81 &82 LTD motors on the 4/6

You can use invader gasket kit on that motor . The invader pistons will work but they are supposed to use a different piston and rings.

Just take it all in stride, no need to get worked up over the little things.

I don't now of anything off the shelf that you could use but there is the option of having the rings chromed to work in the cast bore.