[johnsjmc]

I too played with Corvairs years ago. The engine pic in the post above is shown with a 140 hp label but the 2 carb engines were 85-110 hp max.depending on year and displacement . The 140 hp had 4 carbs
Stock pistons in all engines even the turbo were cast and prone to cracking below the rings.
The barrels are iron and heavy and NLA new.
Forged pistons were available years ago and I used them in a turbo rebuild but even back then I had to source them from several warehouses to find a full set.
Doing it today I would also look for a type 4 VW engine and build it up as many more parts such as oversize pistons and barrels are available.
GM has forgotten they ever made Corvairs and other than a couple of specialty places like Clarks ,parts are very hard to source especially performance parts.