Probably a stupid question but I figured the wise people here would know this.
On an early C40E hipo 289 5 bolt block it has a 3M3 for a date code. Has 3M build date code on pad by head and on oil pan rail.Not same date but later in month.
Has correct main caps and C3 rear cap and dont appear to have been altered filed etc. line bored/honed.
No seqential numbers on side pads under heads like fairlanes have.
No serial number on oil pan rail. Block was tanked so no orange paint markings etc.
Most all the rest of the blocks and 6 bolts I have seen stop at L for Dec. date code. Was that year date codes that way? or a 1/2 year thing. Leap month !!! or???
Thank you SSB.