first of all, most people say to run things through the brake booster, i think thats way too much suction for a liquid, maybe for a spray its fine, use a smaller hose to help regulate how much is sucked in better. you can also put a basketball pump pin on the hose and just submerge it and not have to worry. but in my opinion i would put it in a spray bottle and spray it in through the intake tube (pcv hose) so you can hit that throttle body with it too. you cant really suck straight liquid this way through because it may be too heavy and just fall down into the air box.
which way did you run it through the pcv line, did you make it so it flowed into the crankcase, or the other way into the intake tube
if you made it go into the crankcase then its just in the oil. same as pouring it through the oil cap.
i think what it ment by a vaccume that went into both heads means a line going into the intake manifold that would go in both heads air ways.
If you did run it into the pcv directly into the crankcase than its went straight into your oil and i think seafoam says your not supposed to drive more than 500 miles with the oil afterwards, it breaks down the viscosity while cleaning sludge.
theres a really neat way to run stuff through your engine, even while driving, ive seen people do it who have headlight wipers and sprayers most people dont even use, but you can do it with your windshield sprayers if your willing to give them up, just run the sprayer hose to a vaccume line and pour your liquid of choice into the resivor. Ive seen people do this as cheap water injection, if you do it right i hear you will get a compression increase, i advise against this cause if you do it wrong and your engine blows up just like running too much NOS.
