IF your engine is one of the late 261s (after 1959?) it will have two HUGE HALF inch NPT holes on drivers side for filter. Those large holes were only on these late 261s, any smaller oil holes and it could be an early 261 or a 235.
Also, I have three engines with the II captains bars, one is a 53 powerglide 235 next is a 55 first series truck 261 and last is a 1961 261.
Last edited by JiMerit Boltr#43; 05/15/2014 4:40 PM.
