inherited a motorcycle trike project about 2 years ago. The person who gave it to me passed away before he could tell me what year or model of Oldsmobile he had used. All I know is that it was an Olds, front wheel drive V8. The engine, I was told is good, so it's worth pursuing. The only numbers I have been able to get from the motor/transmission are the following:

I believe it's a big block, I read that if the width between the valve covers is 14" it's a big block. It's just at 14"

Here are the #'s

409/147 On both sides

7A by #1 (i think #1, it's the front drivers side cylinder)

The transmission had a plate with the following numbers if this helps

 

81 AK 7620

 

7A would be small block heads im pretty sure

 

If it's a big 7 and a smaller A, the heads are 72 350 heads.
If it's a big 7 and a big A they are Olds 307 heads.
The block casting number will be right by the oil fill tube on top/behind the water pump.

395558 2 would make it a 350.

 

409147 is the casting number for the 1972 7A heads. This implies that the motor is also a 1972 350, but who knows.