I have 3 rocker arm assemblies with 3 different numberings

Older 235: 9 0 3 4
Newer 235: 87 88 85 86
1961 261: 7 8 5 6

(The four code numbers are for 1-3-5 exhaust, 2-4-6 exhaust, 2-4-6 intake, 1-3-5 intake, respectively.)

Could it be that they mixed the 7 and 8 from a 261 with a 3 and 4 from an older 235? Is there a difference in their heftiness?


1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.