View Full Version : Indmar Thermostat Part #

07-21-2015, 03:34 PM
Anyone know the Napa part number for a 160 degree tstat that will fit my indmar 5.7L FI engine?

Also, which spark plug should I use? Id like to replace them. Thanks!

07-21-2015, 03:52 PM
Looks like I will be buying the AC DELCO MR43LTS plugs.

Indmar thermostat part number is 985009

07-21-2015, 05:14 PM
I changed my thermostat(2 bolt) and confirmed 25 - 32 ft lbs of torque on the bolts.

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07-22-2015, 04:27 PM
The subsitute part number for the S985009 is Sierra part number 18-3649. The cost is $41 vs $19, respectively.

Is there any reason not to use the Sierra thermostat? Even if it doesnt last as long, I could do 2 sierras for the price of an OEM. Not counting gaskets etc.

Do I have a 2 bolt or 3 bolt cover on my 03 lsv?

07-22-2015, 04:27 PM