Big Block Head ID/Codes, Casting Numbers
If it's an A, B, or C head, look for the engine unit number/ID code as
detailed in the Blocks section under
Big Block Unit Numbers. 1967 C heads had this number; 68-9's did not.
So, if your C head has a
stamped ID like V2023456G in figures about =BC" tall, that'd be from a
1967 400-4V, possibly a W-30. If
no such ID is stamped in, then it's either a 68-69 C head, or a 1967
head from the left side of the engine.
Check the other end of the other
head.=20
ID/ Casting
Code Year(s) CID CCs Number Notes
A '65 400 80 383821 Unique 3/8" stud and nut rocker
425 mounting, using a 3-piece rocker
pivot assembly; all except=
irrigation
B '65 425 80 383821 Later '65 heads. Some use 3-piece
rocker pivot asssembly.
B '66 425 80 389395 Toro's and 442's got the big
[2.072"] valves. Some use 3-piece
rocker pivot asssembly.
C '67 - '69 425 80 394548 AC '68 H/O's. Toro's and 442's got
big.
455 valves. Rumored to flow the best
of all BB
heads. Can still be found.
D* '68 - '69 400 69.75 400370 W-30 and non-AC '68 H/O's. All
big-valve.
455 69.75 400370
E '68 - '70 455 77,80 403686 455's in general, with 442/Toro's
having big valves.
F* '70 455 80 404438 W-30's. All big-valve units.
G '71 455 80 409100 Generic 455 use, big valves in the
usual applications.
Ga '72 455 80 409100 W-30's. Hardly any, if any at all,
were big-valve units.
H* '71 455 80 409160 W-30's. Big Valve units.
J '73 - '76 455 80,82 411783 All 445's. 'Smog heads',
restrictive exhaust valve pockets.
No big valve units.
K** 455 80 413191
Ka** '73 - '76 455 80 413191 Marine, irrigation, W-30/Toro
replacement head. Most were big
valve units.
Notes:
* These W-30 heads are so rare that they command about $1000/pair.
Affordable for accurate
restoration.=20
** While not quite as rare as the other heads, they are generally big
>Tom,
>
> I always thought that the E heads were modified into F heads by grinding
>off the bottom of E to make it into an F. I am assuming the C is slightly
>rounded, which would not be possible to make out of an E. If the C has
>square corners then it would be possible, but I don't know since I haven't
>seen one. If I recall correctly F heads are worth more $ than the C heads
>which would make the conversion to an F more likely, but it has been a
>while since I read up on these things, so that may not be right either.
>
>Zak
>
>>chances are 100 to 1 they are E heads that have been doctored
>>>455 olds "C" heads $100 253-761-5667
>>>I am amazed how many of these "C" heads show up when you start looking.
>>>Terry Skinner
>>>Webfooted in Washington
>>>'76 Glenbrook
>>>
>>>
>>>
>>=20
>
>
