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I'm checking out a 1970 454 4 speed that supposedly hasn't been rebuilt. Here is the pad stamp. It looks suspicious to me. Aren't the broach marks supposed to be parallel to the crankshaft? And most of the stamps that I have seen have the main block stamp (not the VIN stamp) on the inboard side (closer to to the center of the engine). What do you folks think? Thanks.
On big blocks the VIN derivative is closer to the center of the engine. That one looks pretty good (based on poor photo).
You are correct about broaching marks parallel to the crank, the photo you have doesn't really show broach marks, pad needs to be cleaner and higher res photo taken.
It looks to me like the lines perpendicular to the crank are from someone trying to clean up the pad for a better look (steel wool or perhaps sandpaper.
If a restamp, it looks pretty good. If everything else matches (casting number/casting date of block), you might be OK.
Can't say whether it's a restamp. Looks very, very good. If memory serves, I read in the NCRS judging guide that the engine and VIN derivative stamps have been known to be backwards on some of the 70-72s.
I just pulled the trigger and bought it. It is a three previous owner, numbers matching 1970 454 4 speed with 81,000 original miles. I just needed some other opinions, and you helped me out. The dealer assured me it was a 110% original block, but you know how that usually goes.
I looked at that several times while the auction was running.
You got a real "keeper".
It is a perfect car to drive and enjoy - and if you want to, do a true NCRS resto on.
It has all the real original parts, from looking. The only item I saw non original is the exhaust. You can replace it with GM NOS for around 2K if you really want to (maybe a bit more ...).
My car looked the same when I bought it, I drove it for nearly 4 years while preparing to do the NCRS resto on it.