I am trying to figure out if my 455 motor the original motor that came in the car in 1970
my casting number says 1231718-E
I am trying to figure out if my 455 motor the original motor that came in the car in 1970
my casting number says 1231718-E
You can't identify much with a casting number. Look up at Buick Identification by the numbers, it will tell you where the numbers you want for id are.
there are, or were, two stampings on the block that would designate year.
the two letter engine code for a 1970 Electra should have been "SF" and indicates the 370hp variant, which was the highest OEM rating Buick ever had in a production vehicle.
the EIN ( short variant of the VIN ) should be something like "4 0 H xxxxxx". 4 indicating the Buick division, 0 indicating the 1970 model year of production, H indicating the Flint MI plant ( there are other plants but Flint is primary ) and the last 6 digits matching the VIN of the original car it was installed in.
https://www.teambuick.com/reference/...gine_where.php
https://www.teambuick.com/reference/...ine_number.php
your engine should have Buick Red paint and the valve covers should have 5 bolts each. 6 bolt valve covers indicate someone swapped in a Buick 350.