94z opti has air hoses or vents?
09-18-2006, 08:30 PM
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94z opti has air hoses or vents? I'm ordering my msd opti for my car this week. The year 94 overlaps. P/N 8381 for 92-94 with fresh air hoses. P/N 83811 94-97 vented. Someone on here had told me P/N 8381 but i just want to mkae sure b4 I order.
09-19-2006, 09:23 AM
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This isn't really necessary to answer your question, but for clarification, there were two types of Optisparks from factory:
1) The 1992-1994 LT1 came from factory with the type-1 (spline-drive) "non-vented optispark". They called this the non-vented version since it doesn't use vacuum lines to flush out the housing, though it did technically have three vent holes along the bottom of the metal backing plate.
2) The 1995-1997 LT1 came from factory with the type-2 (pin-drive) "vented" optispark. It had two vacuum fittings on the housing in which fresh/metered air was circulated through the housing to eliminate moisture -- in hopes of prolonging longevity.
As far as the MSD Optispark is concerned, I'm assuming the MSD-8381 is what you want. In the description "1992-early 1994, with fresh-air hoses", the "fresh air hoses" part probably means that it ships with new vacuum hoses -- since your 1994 Z28 doesn't have them from factory. (That is, it's not a description of what you have, rather, a description of what you are ordering).
Make sense?
1) The 1992-1994 LT1 came from factory with the type-1 (spline-drive) "non-vented optispark". They called this the non-vented version since it doesn't use vacuum lines to flush out the housing, though it did technically have three vent holes along the bottom of the metal backing plate.
2) The 1995-1997 LT1 came from factory with the type-2 (pin-drive) "vented" optispark. It had two vacuum fittings on the housing in which fresh/metered air was circulated through the housing to eliminate moisture -- in hopes of prolonging longevity.
As far as the MSD Optispark is concerned, I'm assuming the MSD-8381 is what you want. In the description "1992-early 1994, with fresh-air hoses", the "fresh air hoses" part probably means that it ships with new vacuum hoses -- since your 1994 Z28 doesn't have them from factory. (That is, it's not a description of what you have, rather, a description of what you are ordering).
Make sense?
