Miata Parts, Intakes, Superchargers, Headers, Exhausts, Shocks, Springs, Sway Bars, Brake Kits, Autocross and track mods.
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I'm pretty sure I read (miata.net) the 2.5 was the smallest size with balance shafts. Joe at Dynotronics probably knows the answer if Brian can't answer for sure.
'99 Base Sport with bolt-on hardtop and '08 PRHT GT. I love them both. SCCA, PCA, BMW San Diego region #105
I have a 2.5 block on my NC from a Mazda 6. I removed the balance shafts, removed the gear from the crank and used the stock NC sump. All works well with no issues. You will need to use the timing chain and guides from the 2.5L and a the Cosworth tensioner is a good move.
330WHP MX5 NC 2.5L HKS Supercharger Plus lots of Goodwin go faster bits - Brisbane Australia