Best factory 351W Block.

[BilLster]

69-70 are great but slightly smaller deck height 71-74 are the ones i look for. try and get one with all the excessories and hardware with it. I always look for a vehicle that has been rear ended also look at trucks and station wagons before pulling from a car. if you want a roller like 86 up but i cant remember.

351 Block Castings

C9OE-8 69-70
DZAE-BA 71-73
D4AE-DA
D4AE-AA both 74-78 -deck height increased to 9.503
D9AE-ED 79-82
E3AE-BA 83-93 -change to external one piece rear main seal
F4AE-?? 94-98 -change to block for roller lifters

Deck height:

69-73 9.480"
74-up 9.503"

69-76 heads all use 1.85 and 1.54 valves with 60cc chambers.
69-78 heads all use rail rockers.
69-74 heads had L shaped water passages with 16 bolt intakes.
77-up heads used 302 size 1.78 and 1.45 valves with 69cc chambers.
79-up heads used pedestal mount rocker arms.
75-up heads had square shaped water passages same as 302 with 12 bolt intake.