NPR Big Bore Kits, NPR Values Options

[birkinboy]

Starting on the rebuild on my 1.8 and looking into a Big Bore kit. See many brands out there. Some look good others look like Chinese junk. Atlanta has Biral cast kits,
any idea what that is and R they any good? Ebay has the QSC kits avail, they are cheap and look it. The old adage 'you get what U pay for' is usually true. Heard good things about the NPR kits but is it true they are NLA? I did locate a new set of NPR's
for $400. Seems like a good price, Is that reasonable?

[Dave_Darling]

Biral usually refers to a cast-iron liner with aluminum fins shrunk onto them. Aluminum has better thermal conductivity, but the iron provides the wear surface. They're more expensive to make than straight cast-iron cylinders.

--DD