M21 differences
Thread Starter
Burning Brakes
Joined: Mar 2014
Posts: 904
Likes: 46
From: Crestline CA
M21 differences
Does anyone know what the difference between a M21 installed in a small block car and one in a big block car? Was looking in the 1968 AIM and the L79 M21 has a different part number than a L36(and I'm assuming L68 and L71)M21.
Burning Brakes
Joined: Nov 2012
Posts: 788
Likes: 100
From: Indianapolis IN
No difference that I've ever heard. No reference to any differences in my rebuild manual either (ie. no breakdown between bigblock and smallblock), unless they had a diff countergear teeth count.
Countergear teeth count was either ; 17,19, 22, or 27.
Countergear teeth count was either ; 17,19, 22, or 27.
Thread Starter
Burning Brakes
Joined: Mar 2014
Posts: 904
Likes: 46
From: Crestline CA
Different speedo drive gear...
