Hey guys, I have a 1978 280z which I thought had the original motor in it. With help from this forum I found out the engine has been swapped, it now has a f54 block and a p79 head.

My question is before I knew the motor had been swapped, I Bought NGK plugs B6ES-11, should I be running BP6ES-11 which I think is a projected plug. I am having a slight misfire at idle , will these plugs help since they are closer to the pistons? I am assuming this is what projected means. Wi

I just saw this posting and did install NGK BP6ES-11 and gapped them to .045" in my 240z L24, E88 head and P30 block. Yes these are the "projective" type plugs and are recommended. Because I have both a Mallory Unilite "Breakerless" Distributor and Mallory Promaster (29440) Coil with the MAG700 ballast resistor installed, the coil puts out a 500us Spark duration which is 5-times longer and hotter than the stock coil - so it's been recommended in many Classiczcar articles that we should gap them to .045" rather than at the stock gap of .030" - .035" . My car starts terrific in the cold with my manual choke since I live in Minnesota and idles flawlessly even in 5F-10F temperatures once then engine warms to 120F or hotter.

You may want to try getting a set of the NGK BP6ES-11 they are cheap, $2.19 each through NAPA. Given I had to order them and pay shipping of $6.95, I purchased 12 so I had a backup set.

Good luck and hope this helps!