Brand or type?
I would say...and speak from experience (I have an Amazon with B20b) NGK plugs.
Standard plug is a BP6HS or, for fast/motorway driving etc,..use a BP7HS.
There is a resistor version of this plug if the standard plug causes noise on your Radio, the plug number then has an R in it for Resistor eg, BPR6HS etc
However....when Igot my car..it had been fitted with BP8HS plugs...a very cold plug to stop the engine running on etc...
But I had real problems starting the car..in fact...on one occasion I simply couldn't start it..period..even if i heated the Plugs over our Gas cooker!! with the engine heater plugged in ALL night too.. and the engine has done less than 5,000 miles since a full re-build.
I local Rally shop said 8's were crazy...they do not even fit them in 500 bhp Subaru cars...so sold me some 6's..I fitted them and the car started instantly!
Only slight problem is..it now runs on every now and again...just for a split second..so I just purchased some 7's to try...see if it hit's the spot perfectly.
I always run my B20b engines on Shell V max (UK 99ron octane)...these engines would have originally been run on 100 octane...on my last Amazon I experimented with fuel...and V-Max was the best...even BP Ultimate wasn't that great.
On top of this I add Tetraboost..the only genuine lead additive..even though my head has been modified for unleaded.
I also run my 940 Turbo on V-Max too..
James
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