496 Mag HO Spark Plug Gap
 

What is the proper gap for this motor?

Also, Do you guys replace with the platinum plugs that come in it stock or go with standard plugs? The platinum replacement plugs from Merc are around $16.00...NGK platinum plugs are around $9.00.

Please give comments.

-Craig

Re: 496 Mag HO Spark Plug Gap
 

Isn't the gap printed on the stock cover (plastic pc over the flame arrestor)? It is on my 350 MAG

Re: 496 Mag HO Spark Plug Gap
 

the plugs that come in the engine are NGK so if you found the # somwhere else fro less go for it, Merc can be be pretty proud of their stuff sometimes (well most of the time) I believe the plug gap is 0.060" but look it up to be sure and don't trust whats on the plastic cover, They have incorrect info on them alot of times.

Re: 496 Mag HO Spark Plug Gap
 

denso's came in mine,go to sparkplugs.com (i think) they show the plugs for the HO i think 8.00 or so.

Re: 496 Mag HO Spark Plug Gap
 

Iv'e seen soem with Nipendesos and some Ngk's but either way the exact replacment plug can been had for about half of mercs price.

Re: 496 Mag HO Spark Plug Gap
 

don't worry i never pay merc's price :drink:

Re: 496 Mag HO Spark Plug Gap
 

The gap should be .60, the original plugs are Denso, and can be purchased at the local GM dealer far cheaper than the Merc. dealer.

Re: 496 Mag HO Spark Plug Gap
 

Thanks everyone for your replies.

-Craig

Re: 496 Mag HO Spark Plug Gap
 

That is correct. Even cheaper at sparkplugs.com.

Interestingly enough, one of our HO owning club members just bought plugs from a buddy of his through Merc using their part number. He paid about $12 wholesale. ($16 and change retail.) The plugs he received are AC Delco. That plug is available at Advance Auto for less than $6 each. Ouch!

Re: 496 Mag HO Spark Plug Gap
 

Here is links to Sparkplug.com they are listed at 8.95
http://www.sparkplugs.com/results_ap...D=18097&mfid=1