The Truth about 318s

1qwikScamp said
the R blocks came out in 89 as a replacement for racers on the right bank it should have an R cast into it right behind the alternator just below the deck and next time you have the timing chain cover off check the water inlets if they are round its just a plain jane block but if they are half moons you really have a pricey item on your hands

Thank you for the reply 1qwikScamp, I am sorry it has taken a while for me to read this thread again, been constantly working on the wifes 67 318 referenced.
The number "GM 318 R" is stamped on a flat surface under valve cover behind/above power stering pump on drivers side. The 1970 referenced # I found cast into the block on passenger side ie: 4 / 1 7 / 7 0. I have just finished replacing water pump inlet holes on it were square like with rounded corners. This must have been a rebuilt engine of some sort due to beeing dipped but not painted. The car also was original 273 cammando, proper vin, badges on fenders, 10" breaks, etc. I wonder where that motor went? So you think this 70 block, rebuilt in 1989 or after>? with the 273 commando taken for one of the FABO members cars about 15 years ago! LOL
But really what do you think?