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Message: <blockquote data-quote="96blak54" data-source="post: 1519461" data-attributes="member: 14727">Most people (99%) think engine oil weights set by the manufacturer is for the entire engine design, which in most cases is true, but not in the Ford Gt case. The 0w-50 is set for GT's tiny intake lasher. This heavy weight is what it takes for that lasher to perform like it should and in turn causes all other engine parameters to be compensated. Meaning the normal modular size lasher for the exhaust in the GT would also need to be designed for 0w-50 oil.If you are using any oil weight less than 0w-50 with the GT lashers, the lasher can really never perform like it should. You are most likely using something like 5w-20 or 5w-30 and this thinner oil will cause the GT lasher bleed rate to be very high. Its simple hydraulics, really. And at low rpm oil psi, the lasher doesnt over come the valve spring and follower 1.8 ratio leverage applied to the lasher....roughly 200lbs. And if you have higher rate aftermarket valve springs, add that on top of the 200lbs.All this is fantastic using the GT lashers on the exhaust side as it would allow variable valve openings with the modulars big cam lobes, but again they would be noisy. Especially at low rpm. Get the rpm up and the noise most likely goes away.FYI: Oil supply to the lashers is only 15psi at high rpmAlso note their is a good amount of wiggle room for factory valve seat to valve tip height. Just incase your new valves are shorter. This could almost be any amount because the lashers them self have a ton of stroke and could compensate any gap. The only negative would be a substantial long valve length, keeping the lasher to bottomed out, which in turn would keep the valve open all the time. Lasher couldnt do its thing. Engine run like crap.Dont assume all ford modular lashers ever made are the same. I assure you, they are not. Most people (99%) dont understand the modular valve train or the My suggestion, return all the stock lasher and followers back into the heads. But 1st Take a big set of pliers, a heat gun, and bleed out the old oil. Heating the lasher to 200degrees and compressing it will open your mind</blockquote>