Eldomiwok

Doing a 455 swap what do these #'s mean

MDchanic

CFD means "Central Forge Division."

I think 68F3 means June 3, 1968, but I may be wrong.

- Eric

joe_padavano

Sorry Eric, but no.

I assume the 68F3 came from the back of the block where the flywheel is located. It means nothing, it's simply a casting lot designator. Contrary to urban myth, the "F3" does NOT in any way relate to nickel content of the block.

CFD 115 is Central Foundry Division and I believe the 115 is the day of the year of the casting (115th day).

Where did you find the "418101" number? If it's from one of the cylinder heads above the center two exhaust ports, look again. I suspect it may actually be 413191, which would be a K or KA head (look for the letter near the no. 1 spark plug). K and KA heads were only used on marine and industrial engines, so that would be an indicator.

Eldomiwok

Thanks for all the info you guy's are so cool.im trying to get my brother on the site he's always busy with work and family for bout 10 years he's had a 71 f85 cutlass. That 68f3 is where u said and they are k heads. Do those suck are they gonna b good in my 72 cutlass supreme350-455 swap? Motor was rebuilt 7 years ago I know the machine shop heads at rebei's auto parts.it was connected to all boat accesory's never fired sitting n garage.now I'm gonna rebuild carb buy headers and drop it n I hope ?

joe_padavano

K heads are a good starting point for a performance build.