The lash adjusters are doing the same amount of work whether being spun by the starter or combustion.

To the O.P. It doesn't matter where you apply the oil pressure to the system. There really is no upstream vs downstream in this system, because there ars no "circuits". Every oil path terminates at a bearing. The oil switch fitting is as good a place as any to pre-lube the engine. That being said, I agree with the sentiment that you don't need to do this.
Maybe do like Erik Kleven said and just floor it while cranking for the first several seconds. This disables the injectors. Personally I'd just start it.

 

Not disagreeing with the general sentiment here ... I'd also 'just let the starter / oil pump do it for a few seconds and GO.'


But - my curious nature forces me to ask. If you injected oil in the system at the oil pressure switch port (or anywhere), wouldn't you force all air OUT and the oil pump itself (or the anti drainback valve in the oil filter) resist backflow sufficiently to force the oil into the heads and throughout the entire system to its natural endpoints?

 

Won't work with a gearator oil pump

 

I used a spray container like the garden sprayers that pressurize, adapted a fitting to fit the oilpressure fitting and pumped it up with a couple of quarts of oil.

 

Not so much the crank shaft as the lifters and rocker arms, If they are not oil filled you risk the rockers becoming dislodged from the cam and valve train.

 

BTW I have built several 4 valve DOHC Ford modular engines and used this method and always worked, just saying.

 

Im with others on this just start it and let idle, cranking with starter wont pick up oil as fast as it running. Plus if the engine has been already ran at some point with miles really its no different than starting after a oil change due to the oil is already where it needs to be. Heres some food for thought ......Ive read in a magazine that when Mexico was building the air cooled bugs that the engine was built in one plant then shipped to the main plant and its test was on a roll on dyno, when the brand new engine fired for the first time it went from idle to valve float in all gears......on a new engine...lol...while they was checking all the other things...lights, wiper, ect....they figured if the engine could hold up to that no one would ever push it that hard again....I wouldnt or advise someone to do it but thats a heck of a test....

 

greg1147---You are thinking the "pedal to the floor start" will not work because the starter cannot rotate the pump fast enough to cause a pressured discharge?

 

Greg, I'd like a little more about this, too. I know you got this answer somehow, but we're going to need you to 'show your work' (just like in math class) for it to make sense for the rest of us.

Thanks.

 

Modular oil pump

Valve train

These two images show the oil pump which is driven off the crank shaft, and the hydraulic lifter which is under the cam lobe.
If the lifter isn't charged with oil the rocker will come off the boss and possibly damage the head.