Question on Block codes...???

[KevinK]

I have a 396 motor with the following:

Cast# 3935440, ...cast date of "G 1 8". (does have "Hi Perf Pass" cast near oil filter mount and behind timing cover)
Front pad stamped "T0715EF", ...partial VIN "18G136909"
...Heads are cast #3931063 with dates of "F258" and "G108"

I believe this to be from a '68 Chevelle 396/350hp 4sp car (re. 'EF'), ...correct??
Also, ...from what I've checked, ...it appears the heads are very late '68 heads??? (June 25th and July 10th) (ref. By the Numbers book, P. 103)


Thanks in advance for any information/confirmation.....

[bertfam]

Kevin,

Correct with an addition that the engine could also have had a 3 speed manual transmission. The heads are listed as being used in 1969 applications with a note that they "could" have been used in 1968 engines built after June 25th, 1968, of which one of yours is that EXACT date!!

Ed

[KevinK]

...Thanks Ed!, ...I suspected the dates were close to a 'switch',. ..but not that close, ...wow!
 
   Thanks,
               Kevin

[JohnZ]

The VIN stamp says it came out of a '68 Chevelle built at Framingham, Massachusetts.

[KevinK]

...ahh, ...now I know what the "G" means, ....Thanks John