Miata Misfire - P0303

[Craig Naylor]

Hi Brian,
I got a replacement head out of a shop in Vegas, no core charge or exchange, paid about $400 shipped 4 yrs ago... out of town tonight, but I'll post their name tomorrow when I get home & can look it up. (google search came up nill)

[Sean Fenstermacher]

From my first hand experience, finding a 99-00 head can be very difficult. The head is commonly sought after by NA miata owners, as it's an easy plug-in swap good for 10-15whp or to go for bigger power with forced induction (typical combination is '95 block for its lower compression and 99-00 head for its superior air flow). I was shopping for one for a couple of years for my old miata. It was incredibly difficult to find a complete head in good condition, refurbished or used. In the end it was easier to just buy a used 99-2000 motor.

If you get lucky, you may find a core but I if you just want to get back on the road quickly, you just might want to repair the head.

If you are looking for an NA head or 2001 or later, you chances of finding a core are much higher!!!