View Single Post
Old 09-10-2011, 01:34 PM   #6
Marco Tahtaras
Senior Member
 
Marco Tahtaras's Avatar
 
Join Date: May 2010
Posts: 3,099
Default Re: model A and model B lifters

Sponsored Links (Register now to hide all advertisements)
Quote:
Originally Posted by Purdy Swoft View Post
I also checked out Vince's site. Vince gives good information there concerning problems with the use of model A tappets on the B cam. All of my engines are model A but I run B cams in a couple of them. I knew that the base of the tappets were different but was told at some time in the past that B lifters were also longer. Vince doesn't mention difference in length so maybe it isn't so. I allways used the adjustable single lock lifters and they are a lot easier to work with and have had no problems with them.


All Ford made "A" and "B" cams had the lobe tip .779" from the center line making it .001" smaller than the cam journals as shown below. To increase the lift on the "B" cam they reduced the base circle of the lobe which in turn required taller tappets to make up the difference.

__________________
http://www.abarnyard.com/
Marco Tahtaras is offline   Reply With Quote