engine help

[luxeryvic]

i have a 77monte withaa 305, im wondering if it the original engine in it because the block is blue, ive never heard of chevy painting thier engines blue

thanks

[inafogg]

its probibly a pontiac engine not uncommon

[luxeryvic]

how can i tell for sure

are pontiac parts interchangable with chevy parts

[bobss396]

Chevy started painting them blue in 1977.

[wannablast]

Ditto on they started painting them blue in 77.

[silicon212]

The color was "GM Corporate Blue", and as others have stated, replaced Chevrolet Orange for the 1977 model year, and was itself replaced with black in the 1984 model year.

[Ratt643]

You need to record the block casting number from the back of the engine behind the drivers side cylinder head. Match that number up with a site like MOR-TEC.com. They carry all kind of casting numbers for GM and even Holley Carbs.

[Slates]

they started painting the engines in 77. because i have a 1981 c 10 and the valve covers were blue and so is the block. but should be the original motor.

[MrPbody]

It's not a Pontiac, and no, Pontiac parts do not interchange with Chevy (engines, that is...). I believe ALL GM engines became "Corporate Blue" in '77, not just the Chevy. I know the Pontiacs and Buicks are, not sure about Olds.

Jim