How to clean a block

[Woj]

I've noticed on several TH400 Vin stampings that the last 3 or 4 digits are not even with the first digits. My guess is that the factory stamped the first two or three digits knowing the car would be in a certain range of a thousand cars and left the last three or four digits until later in the assembly.

Maybe that's the case here? The digits fonts are all good.

[BARRY]

HI i would and i have bolt the oil pan on and sand blast the block and oil pan with the block up side down . Then wash thee hell out of it .

[BLACKLS5]

One of the local machine shops bakes them. The invoice say's "thermal clean". They come out clean and rust free. Just a thought.

[Tuna Joe]

Originally Posted by Woj

I've noticed on several TH400 Vin stampings that the last 3 or 4 digits are not even with the first digits. My guess is that the factory stamped the first two or three digits knowing the car would be in a certain range of a thousand cars and left the last three or four digits until later in the assembly.

Maybe that's the case here? The digits fonts are all good.

I don’t know what Ralph is talking about to be honest.
It looks good to me, broach marks are present, characters match other 68’ L89 blocks that are built close to the vin. And it’s been validated by the same guy that does all of Corvette Mike’s C3s.
I don’t really see the need to defend it.