Difference between .903 and .904 lifters?
#2416169
12/10/17 01:59 PM
12/10/17 01:59 PM
|
Joined: Jan 2005
Posts: 4,243 Charlotte, North Carolina
sgcuda
OP
master
|
OP
master
Joined: Jan 2005
Posts: 4,243
Charlotte, North Carolina
|
Is this just the way they are measured or is there a real difference? Do I need to buy a test lifter first when it comes to a race engine? Is the .904 to allow for slight oversizing with a hone?
Last edited by sgcuda; 12/10/17 01:59 PM.
|
|
|
Re: Difference between .903 and .904 lifters?
[Re: sgcuda]
#2418049
12/13/17 05:20 PM
12/13/17 05:20 PM
|
Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
|
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
|
Is this just the way they are measured or is there a real difference? There are legit differences, depending upon the brand/manufacturer of the lifters. Do I need to buy a test lifter first when it comes to a race engine? Not a bad idea, especially if you're trying to fit the lifters to lifter bushings, etc. The recommended spec, IIRC, for roller lifters in iron or aluminum blocks is .002", which is a crap shoot if one brand measures .9031" and another measures .9038"... which is exactly what I found myself. FWIW, I went w/ the .9038" brand, but my lifter bores are still too loose due to previous wear w/ the bronze bushings.
|
|
|
Re: Difference between .903 and .904 lifters?
[Re: sgcuda]
#2418054
12/13/17 05:28 PM
12/13/17 05:28 PM
|
Joined: Jun 2006
Posts: 660 Virginia
varunner
mopar
|
mopar
Joined: Jun 2006
Posts: 660
Virginia
|
I just measured a set of solids. Largest was .9036", smallest .9034" not too shabby.
Last edited by varunner; 12/13/17 05:28 PM.
|
|
|
Re: Difference between .903 and .904 lifters?
[Re: sgcuda]
#2418097
12/13/17 06:56 PM
12/13/17 06:56 PM
|
Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
|
master
Joined: Sep 2014
Posts: 4,457
Washington
|
The hole size is nominal, so .904 is Chrysler. Not Chevy.
The lifter size SHOULD be made with the clearance built into it. Remember A-B=C?
A is hole size. .904 B is lifter size. .903 C is clearance. .001
I know some of the lifters are coming .904 and I ASSume it's so you can fit them but it's about impossible to hone a hole straight and round that's that small and short. A couple of tenths maybe.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
|
|
|
Re: Difference between .903 and .904 lifters?
[Re: sgcuda]
#2418103
12/13/17 07:16 PM
12/13/17 07:16 PM
|
Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
|
This is why I am asking. I have seen both 903 and 904 listed for Mopar. Cab says 904 is Chevy. Dogdays says 904 is Mopar. Maybe it doesn't matter. Just whichever one fits best? Is there a minimum and maximum clearance you guys like using before a lifter either galls the bore or bleeds off too much oil pressure? Or do they chatter around if too loose? My Indy block does not have any lifter oiling. Do specs change for that? I do the Hughes "thunk" test to see if they are too tight. If too loose there will be low oil psi problems (what I am dealing with right now) & I have purchased some .001 OS lifters & they all mike out to .905". 360 non roller.
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: Difference between .903 and .904 lifters?
[Re: madscientist]
#2418109
12/13/17 07:31 PM
12/13/17 07:31 PM
|
Joined: Jan 2003
Posts: 13,354 Marion, South Carolina [><]
an8sec70cuda
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 13,354
Marion, South Carolina [><]
|
The hole size is nominal, so .904 is Chrysler. Not Chevy.
A is hole size. .904 B is lifter size. .903 C is clearance. .001
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
|
|
|
Re: Difference between .903 and .904 lifters?
[Re: madscientist]
#2418439
12/14/17 01:14 PM
12/14/17 01:14 PM
|
Joined: Nov 2004
Posts: 3,544 Syracuse,NY
CompWedgeEngines
master
|
master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
|
The hole size is nominal, so .904 is Chrysler. Not Chevy.
The lifter size SHOULD be made with the clearance built into it. Remember A-B=C?
A is hole size. .904 B is lifter size. .903 C is clearance. .001
I know some of the lifters are coming .904 and I ASSume it's so you can fit them but it's about impossible to hone a hole straight and round that's that small and short. A couple of tenths maybe. Agreed. There is no .904 " Chevy" lifter. That is a Mopar size, that Chevy guys, and Ford as well, have adapted to take better advantage of the ramps/lobes, and robustness as well.There is no standard among lifter manufacters, you kind of need to know who does what with their particular brand. I have a drawer full of almost every lifter I can imagine, just for sizing purposes, and even then, they may change and be more than .0005 off when you get a new set. I often have semi custom lifters made, to better size for an existing block that has been bushed ( or not) and can dial in the sizing better if they arent going to re-bush. I can also re-hone a bushed block, get a semi custom, and save a lot of extra cost for the customer.Bottom line, my opinion,get the lifters you plan in using, then size accordingly, UNLESS< you already have a known bore issue ( size or roundness).
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
|
|
|
Re: Difference between .903 and .904 lifters?
[Re: sgcuda]
#2418786
12/15/17 12:33 AM
12/15/17 12:33 AM
|
Joined: Jan 2003
Posts: 3,504 DFW
mr_340
master
|
master
Joined: Jan 2003
Posts: 3,504
DFW
|
My Chrysler Service Manuals lists the lifters at Ø0.9040 to Ø0.9045". Lifter bores to be Ø0.9050" to Ø0.9058".
Floyd Lippencott IV
|
|
|
Re: Difference between .903 and .904 lifters?
[Re: mr_340]
#2418983
12/15/17 01:55 PM
12/15/17 01:55 PM
|
Joined: Nov 2004
Posts: 3,544 Syracuse,NY
CompWedgeEngines
master
|
master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
|
My Chrysler Service Manuals lists the lifters at Ø0.9040 to Ø0.9045". Lifter bores to be Ø0.9050" to Ø0.9058". You will find that can be from dead nuts on, to over .0025 off, there just isnt a " norm".Many lifters measure .903, or .903 and change. Some measure .9045. Some, within the same set, arent within hardly .0005 of each other. Its a crapshoot.
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
|
|
|
|
|