Some folks don't understand simple math of the overbore and cubic inches. There is a 312 Y Block for sale locally for $6000.00 and it has a .060" overbore. He claims it is a 342 cubic inch engine. Supposed to be a Thunderbird engine, but has wrong thermostat housing, wrong water pump pulley, wrong exhaust manifolds, wrong carburetor, etc. Yes, all '57 Y's were Thunderbird specials on valve covers, but not actually Thunderbird specific engines. The simple math is 3.860 x 3.860 x 3.44 x 6.2832 = 322.043 cubic inches. He will not accept the facts, and has had the engine for sale for at least three years on Craig's list. This guy is hyping his car for a future sale to some unsuspecting person with deep pockets and a great profit. Joe-JDC