512Stroker
We are all here because we are not all there.
Why do some lifter manufacturers offer a .903 solid lifter vs the standard .904 ?
.903 Solid Lifters?
- Thread starter 512Stroker
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pishta
I know I'm right....
When I was researching solid roller 426 lifters, I saw some that were spec as .903 and the same place had 440's as .904. Maybe it was for clearance or tolerance or something. Weird, were the hydros .903 also?
512Stroker
We are all here because we are not all there.
I did not look at the hydraulic lifters, just solids.
Maybe when you bush a lifter bore you use .903's? Just guessing
Professor Fate
Push the button, Max...
Pure speculation: If you bush the lifter bores or tube the oil galley (small block), you may want to run a bit more clearance without pressurized oil at the lifter?
Professor Fate
Push the button, Max...
Treed me!
512Stroker
We are all here because we are not all there.
What would it hurt to run a .903 in a .904 lifter bore? Oil pressure?
Professor Fate
Push the button, Max...
That would be my guess. Everything in the bottom end of an engine is nothing more than a controlled oil leak... the issue can be keeping it from becoming excessive- a little here, a little there.
PRH
Well-Known Member
The old MP P2843177 solid lifters were listed as .0005” undersize.
They measure .9035”.
They measure .9035”.
512Stroker
We are all here because we are not all there.
512Stroker
We are all here because we are not all there.
Well according to the Tech Guy at Crower .903 vs.904
"they are the same animal"
Just a labeling thing
"they are the same animal"
Just a labeling thing
.904 is not the lifter diameter.
Since that's how the factory did every single one, no, it'll be fine.
The confusion comes in because .904 is Chrysler's lifter BORE diameter in the BLOCK, while .903 is the actual lifter diameter itself. Some vendors incorrectly list the lifter diameter as .904 and that's incorrect. Chrysler's lifter diameter in these engines is .903 and always has been.
512Stroker
We are all here because we are not all there.
You are dead on with your info.
Rusty do you have any preference standard weight vs light weight solid lifters?
PRH
Well-Known Member
Rather than get into a debate about what size the lifters are “supposed to be”........ I’ll offer a couple of pics.
One is the specs listed in the catalog from Hylift Johnson, the other is a mic measuring one of those lifters:
The lifter bore burnishing tool for a Mopar from Goodson is .9060” diameter.
One is the specs listed in the catalog from Hylift Johnson, the other is a mic measuring one of those lifters:
The lifter bore burnishing tool for a Mopar from Goodson is .9060” diameter.
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PRH
Well-Known Member
That is the part number for the lifters that were included with all the V8 solid lifter cam & lifter kits sold by MP.
.0005” undersized....... from the std size of .904
I guess it would depend on my budget...which we all know is non existent....and what I was doin. If it was an all out race effort, I'd choose the lightest lifters I could find. To me though, the size of the roller and them being pressure fed is WAY more important than weight. I would want one with as big a roller as will fit....I THINK that's .850 and want them pressure fed. I'm talking of solid roller of course. Hydraulic rollers are a total waste of space, IMO.
PRH
Well-Known Member
If you say so.
The smaller size was on designed on purpose as most higher lift solid cams applications were for high performance/high RPM applications. Mopar Performance parts spec get it! In the day if you wanted to buzz up an engine you usually were running solid flat tappet camshafts
mopowers
Well-Known Member
I've always wondered of .904" was the lifter diameter or bore diameter. Out of curiosity, I just went out and measured a couple unused Sealed Power 273 lifters that I use for degreeing cams and they both measured right at .904" using two different mics (Starrett and
Brown and Sharpe).
Brown and Sharpe).
I wasn't really givin three craps WHAT the diameters were. My point was that a .904 lifter won't fit in a .904 lifter bore, now will it?
And regardless of what measurements show, the printed Chrysler spec for lifter bore is .904. The book PRH posted above says the lifter diameter is .904. A grammar school kid can tell you a .904 lifter will not fit into a .904 hole.
I mean guys, we're talking about a .001" difference here. Lots of things can account for that, not the least of which is ambient temperature.
Yet we're arguing about .001".
Honestly. I SWEAR.
And regardless of what measurements show, the printed Chrysler spec for lifter bore is .904. The book PRH posted above says the lifter diameter is .904. A grammar school kid can tell you a .904 lifter will not fit into a .904 hole.
I mean guys, we're talking about a .001" difference here. Lots of things can account for that, not the least of which is ambient temperature.
Yet we're arguing about .001".
Honestly. I SWEAR.
Exactly.
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