View Full Version : FMS Roller Lifter question
06-24-2009, 12:07 AM
This may seem like a silly question, but just want to confirm what I know and have read about installing roller lifters. I'm in the process of putting together my valve train and will be installing FMS roller lifters in my new build. Everything I know and have read is that it does not matter which direction the lifters go, as long as the flat spots are aligned and the dogbones seat correctly. Only thing that has me wondering is the oil chamfer on the side of the lifter bearing surface and whether it matters if that is on the cylinder side or the valley side? Call me crazy, but for some reason, I'm thinking it should matter for oil flow. Any help is appreciated.
06-24-2009, 11:33 AM
doesn't matter which way, the oil fills the groove all the way around. ford motorsport lifters are the same as the stockers BTW.
06-24-2009, 01:24 PM
i was always taught, on small block chevy stuff anyways, is that the bleed hole needs to face the valley side (up) so air can escape, but that might just be an old myth too....
06-24-2009, 02:46 PM
06-24-2009, 11:21 PM
Thanks Matt, I do know they are the same as the stock ones. Not my first pick, but the price was right. Thanks for the replies everyone.
06-25-2009, 11:57 PM
The air would rise to the top of the lifter so the escape philosophy doesn't work.
I have also read that it doesn't matter.
When I put the retro-fit roller kit in my wife's 1968 block I put all the oil holes towards the cylinder side. Here is my philosophy on that.
Oil is pumped through the lifter bores and this is where the lifters get oil not just to lubricate the lifters but also to provide oil internally for their hydraulic action. Gravity will encourage the oil to flow as low as possible in the bores. Because of this I put the oil hole towards the cylinders which, because of the angle that the lifters are at in the block, has the most likelyhood of keeping that oil hole in oil. The lifter sucks oil into itself through that hole to create the hydraulic properties of the lifter.
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