Hydraulic to solid lifter camshaft

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K.O. SWINGER

K.O. SWINGER

Meeting in the alley since 1976
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So I'm a little confused, I was always under the assumption that moving to a solid lifter camshaft on a hydraulic la motor (340) required restricting oil flow via peening or bushing lifter bores. Am I wrong? lately I was told that no oiling modifications or changes need to be made. I know there are threads going into oiling improvements but my question is yes or no can you convert a 340 to solid lifters without modifications and without sacrificing oil pressure to the bottom end.
 
I block the oil off on everything solid unless the customer just loses his mind over it. There is no reason to have all that oil at the lifters if it doesn’t need it.

I’d block it off.
 
silversedan said:
it depends on the lifter oil band and the lift of the camshaft.
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That makes sense to me when I try to reason the reasons and what is really going on at the lifters, but I am definitely better safe than sorry kind of guy
 
I simply asked a similar question over at fbbo "When would you consider blocking the non-bearing feed oil galley".. merely as an academic question and was pretty much ridiculed.....
"Why the hell you block off oil to anything!!??" was the typical response.
It was like they'd never heard of such a thing.....
I think mostly Andy and PRH gave the only helpful responses(because they're cool like that) which was they never blocked off the feed, restricted it maybe, in certain applications.
Anyway..I wouldn't block it off if using EDM lifters which is kinda what the guys above are saying.

I'm still unsure as to when (as in what performance level/expected RPM/etc) it's desirable to block it. YR's answer sheds some light, maybe just builder preference with certain lifters? But then the factory didn't block anything off....and those tappets were the smooth non-oiling style.
 
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beanhead said:
I simply asked a similar question over at fbbo "When would you consider blocking the non-bearing feed oil galley".. merely as an academic question and was pretty much ridiculed.....
"Why the hell you block off oil to anything!!??" was the typical response.
Kinda surprised me actually, considering who some of the comments were coming from. It was like they'd never heard of such a thing.....
I think PRH gave the only respectable response (because he's cool like that) which was that he never blocked off the feed, restricted it maybe, in certain applications.
Anyway..I wouldn't block it off if using EDM lifters which is kinda what the guys above are saying.

I'm still unsure as to when (as in what performance level/expected RPM/etc) it's desirable to block it. YR's answer sheds some light, maybe just builder preference with certain lifters? But then the factory didn't block anything off....and those tappets were the smooth non-oiling style.
Click to expand...
Mostly big block guys there. You want small block info. FABO is where it's at.
 
toolmanmike said:
Mostly big block guys there. You want small block info. FABO is where it's at.
Click to expand...
My question there was in regards to big blocks....is it any different? As far as when you might want to block oil to the one side? I didn't think it would be...
 
For the typical street, street/strip, basic bracket race type build........ especially when using Mopar style solid lifters(no oil band)....... you don’t “have to” block oil off to anything.
Think ....... 273.

I ran a 340 in my car for a couple years of bracket race use.
Shifted at 7500.
Zero oiling mods, other than a larger capacity oil pan.
Never had any issues with it.
 
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