89 Spark Plugs

[BgBlock69]

I went to the local Dealership today and bought new plugs for my 89 vert. The plugs he sold me are AC Delco FR5LS 1" from electrode to base, this is a long plug. The plug that was in the car was AC R45TS approx. 5/8" from electrode to base. The plugs I bought Correct????? or are they going to hit the pistons.

Thanx

 

[Ken]

My '87 owner's manual calls for AC Type FR3CLS (.035 gap) (for the aluminum heads). I'm not sure if the iron heads are different but I think so. It is a long, extended-tip plug.

 

[Magmotor]

This is right out of my '89 owners manual:
Spark Plug-AC Type FR5LS (0.035" Gap)

Here's out of a service manual:

 

[gregc11514]

This is right out of my '89 owners manual:
Spark Plug-AC Type FR5LS (0.035" Gap)

Here's out of a service manual:

Uhhhh My 89 Vette Manual says on page 6-2 Under Engine specs Spark Plug AC Type FR5LS What Gives???? :confused