Trying to find correct spark plug for my engine

[ClaySmoove]

I have a mercruiser 3.0 alpha one (I believe Gen 2 given that it’s a 1998) and I’m trying find the correct spark plug part number for my engine. Where’s a good place to look up by engine serial number? Mine is 0L040751 and when I look it up other places two different parts numbers come up which have different extents (1/2” vs 3/4”). Just want to get the correct spark plug. Thanks!

 

[Fun Times]

Your OEM MerCruiser spark plug part number is 33-816336Q which right now crosses over to NGK, BPR6EFS... 'Though AC-Delco plug number MR43LTS is just as nice of a choice too if you run across them in your research.

3.0L GM 181 I/L4 1 1998 - 0L010042 THRU 0L096999

3.0L GM 181 I/L4 1 1998 - 0L010042 THRU 0L096999

www.mercruiserparts.com