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Old 08-15-2019, 10:26 PM   #20
Bored&Stroked
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Join Date: Jan 2011
Location: Central Ohio
Posts: 2,111
Default Re: FH Valve Springs

All the lubrication for the lifters, the lifter bores and the cam in general comes from oil being splashed or slung off the crankshaft. There is no oil being fed to the lifters. And yes, there are various folks who have drilled pressurized overhead lifters to feed oil to the cam - and there are roller lifters where pressurized oil is fed to the roller bearings . . . just no such concept in our flatheads.

Now, if you wanted to plumb the lifter bores for oil pressure and then build custom lifters to capture that pressure and feed it to the cam - can surely be done . . . but for what real purpose? At 65 - 85 lbs of spring pressure (on the seat) there isn't much use for it. BUT, if you can imagine it . . . it can be done . . . and if it makes your happy, I say go for it!

On our Flathead Cadillac Bonneville engine, we have full pressure to our custom lifter blocks and we feed the oil pressure to our roller lifters (which we made). The cam lifts .520, so having more oil for the rollers makes us sleep a bit better at night.
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