Hey guys im getting ready to start my 1923 490 engine. I saw a post from a guy on another site that had copper lines under the block running from the center main to the front and rear main opposite the cam side. Is this stock or a add on? I dont have them on my block I looked at swedchevys pics i didnt see them either. Pics are copper lines-sweedchevy block-my block. Theres also a bolt and nut where theres suppost to be a spike at the rear of the crank. This does have the cone clutch also.
Rooster

Ok I messed up! Yhe copper lines are in the cam side!🤪
Rooster