Small Block Mopar Engine Date Code 3-4-66

If you can get a part number or casting number off the opposite side of the block that the date code is on we can look it up and find out what it is. If the valve covers are off and you're sure it isn't a poly it has to be a 273. The casting number won't tell you whether it is a Hp engine or not. You'll have to pull a plug and have a peek at the piston top to be sure. tmm