DOGMAN
Well-Known Member
- Joined
- August 2, 1999
- Messages
- 439
- Reaction score
- 0
- City, State
- Mission, KS
- Year, Model & Trim Level
- 91 XLT
Doc,
4458 is the correct part number for the Bosch +4 Platinum plug for your motor. I just installed a set yesterday and just double checked the box they came in to verify the number.
The reason the threads are longer is because of the different construction of the +4's compared to conventional plugs. The overall length from electrode tip to plug seat is the same as conventional plugs. The +4's just look a little different.
I like the way mine perform so far. What has everyone been paying for the plugs? Mine cost me $5.99 each at Advance Auto Parts. I didn't shop them around.
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DOGMAN
91 4dr 5sp
5.5" Superlift
4458 is the correct part number for the Bosch +4 Platinum plug for your motor. I just installed a set yesterday and just double checked the box they came in to verify the number.
The reason the threads are longer is because of the different construction of the +4's compared to conventional plugs. The overall length from electrode tip to plug seat is the same as conventional plugs. The +4's just look a little different.
I like the way mine perform so far. What has everyone been paying for the plugs? Mine cost me $5.99 each at Advance Auto Parts. I didn't shop them around.
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DOGMAN
91 4dr 5sp
5.5" Superlift