Originally Posted by tclederman
wolffcub,

My guess is the same as your guess - smaller combustion chamber in later 261 heads?

I have a '54 & a '59 261, both have 3836850 cast heads.


BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022