What plugs to fit?
 

Hi All, first i,d like to pick your brains on what spark plugs should i fit in to my 2.7 1976 engine, my local porsche parts supplier has sent me bosch w4cs silver,but on our hosts site they list wr5dc, which i thought was the plug for the car, is the w4cs the right plug, as my supplier is telling me thats what they list.

cheers Rik

Depends what 76 911 your talking about! Waynes book list the following:
1976 911S (USA) W 225 T 30
1976 911 Turbo W 280 P 21
1976 911 Turbo (USA) W 280 P 21
1976-77 911 W 225 T 30
1976 Euro Carrera 3.0 W 260 T 2

WR 5 DC is for 1982-83 SC (USA/Japan)
W 4 CS is not listed however

1980 911SC W 4 C1
1980 911SC (Australia/Sweden) W 4 C1
1981 911SC W 4 C1

So now your even more confused right?

Thanks Davy, my car is a 75-76 165hp uk spec car, i,m sure when i first changed the plugs it had w5dc in it, but that was along time ago and i,ve been using bosch super 4s since, i could put these back in, but wanted to try the standard plugs when i fire it up for the first time after the rebuild. thanks for help
rik

Rik the host does list the WR 5 DC for your year model so think this is best for your car. But guess it is up to you at the end of the day!