I looked up 3 Sealed Power gears on line. I know this is not the complete answer but it does indicate a LOT of interchange. There were lots of interchange numbers from other companies. The engines listed were their listing but it about covers it. The years tell the story. Sorry, I did a table but it won't post and when I type it out it changes when I post.
Basically #221-2500 fiber cam gear 216,235,261,228-302n GMC 1937-1963.
#221-2526 Aluminum cam gear engines include 250, 292, 153,181 from 1963-1989.
#221-2537 steel crank gear All Chevys 151-250 1938-1993
This one screws up to but here it is anyway.
Last edited by Beater of the Pack; 02/25/18 02:39 AM.
