[1963c-10]

My BBC book says that the casting # 3855961 was for 1966. Is a 396 and could have been either 325 or 360HP. According to chevy blueprints, it shows it to be a 2bolt block and is identical to casting #3855977 (366 truck) except for the passenger car deck heights, cylinder wall revisions and minor casting and machining. Does not have dowel pins for locating timing chain cover. Casting date on the right lower side near the freeze plug in front of the starter. Has the tall tower distributor casting boss. The code TIII3IVR is for the T=Tonawanda plant, III3=Nov 13 and the IVR is for the 396 w/TH400 pass car engine w/Rochester. Chevy often used the letter I in place of the #1. Serial # shows 6L138792 which is 6= 1966 L=Van Nuys, CA assembly plant and 138792 is the VIN