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terraplane valve stems
  • skipsterskipster
    Posts: 195Gold Member
    Just about to order the engine rebuild kit from Dale Cooper for my 37T block,
    but am wondering if i should order the 38T kit instead because of the thinner valve stems(11/32 as opposed to 5/16).Anybody have some advice on the subject?
  • Geoff C., N.Z.Geoff C., N.Z.
    Posts: 2,270Platinum Member
    Yes, definitely go for the thinner (11/32") valve stems and guides. Less inertia, and therefore less load on the timing gears.
    If you're stuck in a hole, stop digging.
  • faustmbfaustmb
    Posts: 1,108Platinum Member
    Does this apply to the 33T8 as well?
  • Geoff C., N.Z.Geoff C., N.Z.
    Posts: 2,270Platinum Member
    The '33 T8 has 5/16" valve stems, so stick with them if they are still okay, otherwise replace with 11/32". The T8 is a unique one-year-only engine, and still has roller cam followers, so best to stick to the original size if possible. The valves are the same as Essex 6's from '27 thru '33, and H 8's up to 1935.
    If you're stuck in a hole, stop digging.
  • cargray
    Posts: 178Expert Adviser
    Believe you will need 38 and up valve spring retainers and keepers also.
  • Geoff C., N.Z.Geoff C., N.Z.
    Posts: 2,270Platinum Member
    Not necessary, as the originals are 3/8" so the valves will go through the spring seats, and the retainers are the same. If you are using thicker stems in an earlier motor you need to drill out the spring seats.
    If you're stuck in a hole, stop digging.