Originally Posted by kevinmack
Here are the heads. the shop didnt have the flexplate so will get that in a day or so.
A friend of mine wants to do a blowback test. So waiting for him on that. Maybe this weekend if its not raining we get the fp and try to drop the motor back in.
Some rust on the heads, ill look for a good way to clean that off...
Numbers on the heads.
D 27 70
D 24 70
Why is one GM 12 and the other 14? Why D 27 and one D 24?
Here is info on your casting numbers: http://chevytech.info/3c3927185.html
I believe D is April. 70 is 1970. One was cast on the 24th the other on the 27th. Having a discrepancy of a few days is normal, not a big deal.