One More Time - Hydraulic Lifter guys, Does this make sense? Options

[ahdoman]

First off I want to say a special thanks to Bleyseng, SGB, LvSteveH, Kwales, JK76.914 and of course the Cap'n for helping me understand hydraulic lifters. (IMG:style_emoticons/default/smiley_notworthy.gif) The good news is that I have progressed from beginner to novice when it comes to these damn things. The bad news is I need to be an expert. Here's the current situation... (All measurments are being done from the carb velocity stacks using a syncrometer with the carb wired open at full throttle. This is because I do not have a compression meter. Yes, the fuel pump is turned off. I am using a remote starter switch to simply turn the motor over). OK, here's the confusing part...I seem to be able to adjust the intake velocity psi simply by adjusting the lash on the lifters.? For example; 1/4 to 1/2 turn past contact and I get very little intake psi. If I go to 1 1/4 to 1 1/2 I get a significant increase in the intke psi. I have also measured this with the motor running (about 2500 rpm) and it seems to remain the same. In fact, If I set cyls 1&2 at 1/4 lash and 3&4 at 1 1/2 there is a significant difference in intake PSI between the two sides of the engine. Should lash on hydraulic lifters effect intake PSI like this? (IMG:style_emoticons/default/blink.gif)