jim wilson wrote:

I am building an older Wheeler Express. I have rebuilt a number of
Mazda 12A's in the past, all of which are still running. I need 210
to 260 hp. Can a 13B be modified to do this and remain reliable?

Absolutely. Piece of cake with a turbo. Non turbo you will need a 3
rotor.
If turbo 13B I would assemble the engine with two piece  3 mm apex
seals to guard against detonation that can fracture the stock 3 piece
seals.

Paul Lamar
 
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