Does anyone know the original GM part numbers for the Valve Springs and Valve seals? Thank you.
The valve springs had the number 146 3226 for intake and exhaust at the beginn of MY; then the number changed to 146 5408, used until 1965.
The seal had the part number 145 3923. Used from 1949 to 1965.
Roger
A seemingly easy question. Not. THere were a lot of changes made as running changes at this time, this was one. The seals were the same (1957 book) 49-57 part#1453923. The springs
1953-1955, 1956 To engine unit #(located on rear of block behind left cyl. head)before 4x-22788,4xk-7453,5x-475,5xk-22,7x-1999,7xk-1266,56s-71 and after56s-950. spring #1459741.
late1956 starting with the above numbers and including 56s-71 to56s-950 as well as all 1957 (57 book) spring #1465408
Note the early ones have a daub of yellow paint the later ones white paint.
For the curious:
outside dia 1 7/32 both
free length 1 63/64 early 2 1/4 late
compressed length 1 9/32 early 1 1/2 late
test (pounds) 152-162 early 155-165 late
Warren