That might explain what I seemed to find last night. On the passenger side (haven't even tried the driver side yet) I could only feel 4 bolt heads. one on the first and last port, and then the two on the middle ports. Now, there is a lot of rust on the bolts that are there, and maybe the other two got broken off. I really don't know.
Right now I am not sure just what engine I have. It isn't looking like the original since I think the vin is different(if I am even reading that right). Getting conflicting ideas about where the vin is supposed to be on this thing. I have the number just below the pass. side head, above the YU, but I can't tell if there is another number down by the timing cover. I am going to have to try to read the date code to see if it is even close to the right year. I might have to remove the timing cover to try to get a better look.
Unfortunately I have to know what the vin on the engine is, due to Ohio regulations. I have a salvage title, which in Ohio isn't legal for street use. To get that issue fixed, I have to have the state inspect the car. They inspect all the vins and if they don't all match I have to have receipts for the odd ones, or I could go to jail if any are from a stolen vehicle, and of course this is how I bought this car. Will have to get a different engine if the vin isn't right.
Hey Russ, that string of digits above the "YU" is NOT the vin, it's some sort of sequencing number or something that was used during assembly, but I've not run across what it means. The vin, if there's one on the motor, will be down low on the front on the passenger side, just to the left of the timing cover. Pontiac didn't start putting the vin stamp on blocks until late in the 1967 model year though, so if your block is older than that - it's not going to have a vin on it anywhere.
So.... A good place to start would be with the 4 character date code, on the top rear drivers side of the block right next to the distributor. The first character will be alphabetic, and will be folowed by 3 digits.
Date code letter deciphering:
The date code is 4 digits. The first digit is the month, the next 2 digits are the day of the month, and the last digit is the year (6 could be 1966 or 1976).
J=October ( also September for 1967 model year)
M=December (1966 Only, for 1967 model year)
Another place you should find the vin is on the TOP side of the frame rail (between the frame and the body) somewhere between the rear corner of the frame and the next body mount towards the front, on the drivers side. It can be tough to see because of where it is, sometimes a small mirror helps.