Re: Keep fouling number 3 and 8 plugs
Lawrence------
I believe the "5" the parts store is probably referring to is one of the AC Rapid Fire plugs. You want the AC R45XLS. Most parts stores will carry this. I don't think you'll find 45XLS anywhere today.
If you replace the valve seals, I would seriously consider replacing the valve springs at the same time IF they're original springs. If you find valve springs with an outer spring and inner damper, these are most likely the original springs of GM #3859911. You DEFINITELY want to replace these. If you find springs with an inner and outer spring configuration, then your springs have already been replaced. In that case, definitely keep using these springs. The GM inner/outer spring assembly is discontinued.
If you do replace the valve springs, use Sealed Power VS 1581. This is an outer spring/inner damper but it's not prone to breakage like the original GM #3859911.
While the GM valve spring assembly is discontinued, the retainer (cap) with integral seal is still available. However, I don't know, for sure, if these can be used with the VS 1581. I don't think they are compatible but I could be wrong. Anyway, if you have the updated, dual spring, these are the ones to use. These are GM #3964264. The problem is they GM list for 15 bucks each and you need 16 of them.
If you use the Sealed Power valve springs (i.e. outer spring with inner damper) you should use the stock-type (for your 1967 original application) UMBRELLA seals. The GM seals are discontinued. However, I'd highly recommend using Victor-Reinz B45296 or Fel-Pro SS71152. These are premium FLUROELASTOMER seals. These will probably outlive you. You WILL find that if you still have your original springs and valve seals, the valve seals will be TOTALLY DETERIORATED.
Lawrence------
I believe the "5" the parts store is probably referring to is one of the AC Rapid Fire plugs. You want the AC R45XLS. Most parts stores will carry this. I don't think you'll find 45XLS anywhere today.
If you replace the valve seals, I would seriously consider replacing the valve springs at the same time IF they're original springs. If you find valve springs with an outer spring and inner damper, these are most likely the original springs of GM #3859911. You DEFINITELY want to replace these. If you find springs with an inner and outer spring configuration, then your springs have already been replaced. In that case, definitely keep using these springs. The GM inner/outer spring assembly is discontinued.
If you do replace the valve springs, use Sealed Power VS 1581. This is an outer spring/inner damper but it's not prone to breakage like the original GM #3859911.
While the GM valve spring assembly is discontinued, the retainer (cap) with integral seal is still available. However, I don't know, for sure, if these can be used with the VS 1581. I don't think they are compatible but I could be wrong. Anyway, if you have the updated, dual spring, these are the ones to use. These are GM #3964264. The problem is they GM list for 15 bucks each and you need 16 of them.
If you use the Sealed Power valve springs (i.e. outer spring with inner damper) you should use the stock-type (for your 1967 original application) UMBRELLA seals. The GM seals are discontinued. However, I'd highly recommend using Victor-Reinz B45296 or Fel-Pro SS71152. These are premium FLUROELASTOMER seals. These will probably outlive you. You WILL find that if you still have your original springs and valve seals, the valve seals will be TOTALLY DETERIORATED.
Comment