I have a 400 sbc that has been running great . A couple of days ago I noticed an oil leakfrom the front of the motor.Near the fuel pump, there are 2 vacant bolt holes at the front of the motor that have never been blocked off & all of a sudden, now there is oil leaking out of them. To my knowledge, there is nothing behind there so could someone please shine some light on where the oil is coming from? My mechanic was puzzled when he saw it & said to block them off with bolts. There has never been anything in these holes before & I don't see how putting a couple of bolts in is going to fix the internal problem. Thanks for your patience as I have a VERY limited knowledge on engines.