Fred, if you happen to run across that explanation in you GM manual post it would you please. I wasn't aware of that and would like to ad it to my reference file.
Thanks
Denny Graham
Sandwich, IL

Never mind!! I got out the January, 1950 Chevrolet Sevice News and on page 5 it explaines it. As you said, the aditional pressure of the hydralic lifters called for additional oil flow to the bottom of the bearing surface. Thanks for remembering that.

Last edited by Denny Graham; 02/06/2010 3:46 PM.

Denny G
Sandwich, IL