Valve Seals and forklift head

I am looking for replacement valve seals for my 1991 4G64 but I cant seem to find any... any suggestions?

Also I see 4G64 forklift heads online. Are they the same as the truck head?

No Info eh?

Well, since it's a 4G64, and its a 8 valve head all should be the same. as I remember the Forklift motors didn't get balance shafts and thats the only major difference in the engines.. All the 4GXX engines share parts. I put 4G61 (1.8L) valve rockers in my 4G64 (2.4L) they are manual adjusters.

Not many people hanging out here even know the engines were used in forklifts.