OEM plugs from FCP Groton
 

Just recieved a 5-pack of Volvo OEM plugs from FCP and they have the 3-prong tip, which I'm not familiar with... I have the non-turbo 93 850 by the way... Does anyone know if they are pre-gapped, as well as being the right plug for a non-turbo (if it makes a difference?)

RE: OEM plugs from FCP Groton
 

When I replaced the engine in The Anvil I went the distance and had almost everything reasonable done, including plugs and found the same thing.

The gap should be 0.028 in.

My understanding is that turbo plugs run at a slightly different temperature but if you ordered them online and entered the info correctly, then you should have the correct plugs.

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RE: OEM plugs from FCP Groton
 

Gap them as mentioned above, put a little anti-sieze on the threads, and you should be fine.