Originally Posted by chunk t

Actually K&B makes an .18 size car engine w/recoil. K&B has never offered a "true" .21 car engine, though they had offered the Marine .21 retrofitted with a large heatsink head for use as a road engine (late '70s). Ran good but the block wasn't tough enough to handle the slamming & banging a car would dish out. K&B blocks are light investment castings intended for aircraft. It's pretty priecy to tool up for a new block design & I don't think MECOA has the pockets to do it. Yep, I heard Andy was working on a car oriented MAC, though like the K&B, Andy is going to need a completely different block design.

FYI - any marine NovaRossi, Picco or CMB based engine is adapted from a car engine (note the big heavily reinforced blocks)