Tillbaka
ID/ Use 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 '65 400 80 383821 Later '65 heads. Some use 3-piece
B '65 425 rocker pivot asssembly.
B '66 400 80 389395 Toro's and 442's got the big [2.072"]
B '66 425 valves. Some use 3-piece rocker pivot
asssembly. "-1" after the casting number
on all B heads after April 21, 1966.
C '67 - '69 425 80 394548 A/C '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.
CA Very small ~3/8" ID lettering.
D* '68 - '69 400 69.75 400370 All W-30. Non A/C '68 H/O's. All '69 H/O's.
All big-valve.
455 69.75 400370
DA
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, manual 442's used big valves.
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, industrial, W-30/Toro,
442 4-speed replacement head. Most were
big valve units.