Picking pushrods
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Joined: Aug 2005
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Picking pushrods I'm finishing assembly of my ls7 topped 434. I have measured out pushrod length but not sure which kind to get and I'm looking for suggestions and why. Mostly street car with a few strip passes here and there.
I like to use 3/8 x .082 wall with a .030 oil restrictor.
So a restrictor why? the push rods oil restrictor holes are .080 diam. at 35 to 74 psi is way to much oil directed solely to lubricate single rocker arm, even at 5 psi it's way more than adequate or necessary.
So lets' take a close look at how a restrictor can benefit the performance oriented engine.
Lets put it this way if we can keep oil as a well managed asset we can have the piece of mind and security we deserve when we dump so much money in to our ride, "knowing" and this is power, yes is powerful when you are so sure you don't even worry about a oil pressure gauge at all.
But if you are not sure you will need one and there's enough reason why you should.
That is so unless you know where your oil should go and in what volume,
Prioritizing lubrication is important, here's how it works in a nut shell.
Take a .080 restrictor hole and reduce that to .030 do the math, that's 62.5 % more oil flow redirected to your rods and main bearings from that single one push rod along, take that and multiply times 16 pushrods and what do you have? Mucho mas oil going to your engines main and rod bearings, remember you never restricted oil going to the cam and the lifters, as the restrictor is after the oil went true the lifter, in fact you slow down the oil bleed true the lifters and the cam going somewhere else and use that additional oil to their own lubrication enhancement.
So now you can take a .050 needless bleed savings per pushrod and use your own calculator and figure out how much peace of mind I been enjoying while you worry about your oil pressure gauge.
But you still not sure, ok do this take a tube of some kind drill a .030 hole in it and put motor oil of your choice true it at only 5 psi see if you can rely in that amount of oil to keep enough lubrication on one rocker arm, cause that is all that oil is going to lubricate ones past true the pushrod.
So did you do the math? the answer is .8
3/8 are 74% stronger then 5/16 of same thickness as measure in crush resistance test.
When ever 3/8 is possible to use must aftermarket ls7 heads are clearance for 3/8 push rods.
Must factory heads are not.
So you say that's a lot of bla-bla-bla, opps this was not for the wicket but for the wise.
So a restrictor why? the push rods oil restrictor holes are .080 diam. at 35 to 74 psi is way to much oil directed solely to lubricate single rocker arm, even at 5 psi it's way more than adequate or necessary.
So lets' take a close look at how a restrictor can benefit the performance oriented engine.
Lets put it this way if we can keep oil as a well managed asset we can have the piece of mind and security we deserve when we dump so much money in to our ride, "knowing" and this is power, yes is powerful when you are so sure you don't even worry about a oil pressure gauge at all.
But if you are not sure you will need one and there's enough reason why you should.
That is so unless you know where your oil should go and in what volume,
Prioritizing lubrication is important, here's how it works in a nut shell.
Take a .080 restrictor hole and reduce that to .030 do the math, that's 62.5 % more oil flow redirected to your rods and main bearings from that single one push rod along, take that and multiply times 16 pushrods and what do you have? Mucho mas oil going to your engines main and rod bearings, remember you never restricted oil going to the cam and the lifters, as the restrictor is after the oil went true the lifter, in fact you slow down the oil bleed true the lifters and the cam going somewhere else and use that additional oil to their own lubrication enhancement.
So now you can take a .050 needless bleed savings per pushrod and use your own calculator and figure out how much peace of mind I been enjoying while you worry about your oil pressure gauge.
But you still not sure, ok do this take a tube of some kind drill a .030 hole in it and put motor oil of your choice true it at only 5 psi see if you can rely in that amount of oil to keep enough lubrication on one rocker arm, cause that is all that oil is going to lubricate ones past true the pushrod.
So did you do the math? the answer is .8
3/8 are 74% stronger then 5/16 of same thickness as measure in crush resistance test.
When ever 3/8 is possible to use must aftermarket ls7 heads are clearance for 3/8 push rods.
Must factory heads are not.
So you say that's a lot of bla-bla-bla, opps this was not for the wicket but for the wise.
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Another vote for Manton.
On top of being able to get larger diameters and thicker walls, you can order them whatever length u need, versus set increments. The devil is in the details.
On top of being able to get larger diameters and thicker walls, you can order them whatever length u need, versus set increments. The devil is in the details.
TECH Fanatic
Joined: Sep 2003
Posts: 1,058
Likes: 1
TECH Fanatic
Joined: Sep 2003
Posts: 1,058
Likes: 1
I like to use 3/8 x .082 wall with a .030 oil restrictor.
So a restrictor why? the push rods oil restrictor holes are .080 diam. at 35 to 74 psi is way to much oil directed solely to lubricate single rocker arm, even at 5 psi it's way more than adequate or necessary.
So lets' take a close look at how a restrictor can benefit the performance oriented engine.
Lets put it this way if we can keep oil as a well managed asset we can have the piece of mind and security we deserve when we dump so much money in to our ride, "knowing" and this is power, yes is powerful when you are so sure you don't even worry about a oil pressure gauge at all.
But if you are not sure you will need one and there's enough reason why you should.
That is so unless you know where your oil should go and in what volume,
Prioritizing lubrication is important, here's how it works in a nut shell.
Take a .080 restrictor hole and reduce that to .030 do the math, that's 62.5 % more oil flow redirected to your rods and main bearings from that single one push rod along, take that and multiply times 16 pushrods and what do you have? Mucho mas oil going to your engines main and rod bearings, remember you never restricted oil going to the cam and the lifters, as the restrictor is after the oil went true the lifter, in fact you slow down the oil bleed true the lifters and the cam going somewhere else and use that additional oil to their own lubrication enhancement.
So now you can take a .050 needless bleed savings per pushrod and use your own calculator and figure out how much peace of mind I been enjoying while you worry about your oil pressure gauge.
But you still not sure, ok do this take a tube of some kind drill a .030 hole in it and put motor oil of your choice true it at only 5 psi see if you can rely in that amount of oil to keep enough lubrication on one rocker arm, cause that is all that oil is going to lubricate ones past true the pushrod.
So did you do the math? the answer is .8
3/8 are 74% stronger then 5/16 of same thickness as measure in crush resistance test.
When ever 3/8 is possible to use must aftermarket ls7 heads are clearance for 3/8 push rods.
Must factory heads are not.
So you say that's a lot of bla-bla-bla, opps this was not for the wicket but for the wise.
So a restrictor why? the push rods oil restrictor holes are .080 diam. at 35 to 74 psi is way to much oil directed solely to lubricate single rocker arm, even at 5 psi it's way more than adequate or necessary.
So lets' take a close look at how a restrictor can benefit the performance oriented engine.
Lets put it this way if we can keep oil as a well managed asset we can have the piece of mind and security we deserve when we dump so much money in to our ride, "knowing" and this is power, yes is powerful when you are so sure you don't even worry about a oil pressure gauge at all.
But if you are not sure you will need one and there's enough reason why you should.
That is so unless you know where your oil should go and in what volume,
Prioritizing lubrication is important, here's how it works in a nut shell.
Take a .080 restrictor hole and reduce that to .030 do the math, that's 62.5 % more oil flow redirected to your rods and main bearings from that single one push rod along, take that and multiply times 16 pushrods and what do you have? Mucho mas oil going to your engines main and rod bearings, remember you never restricted oil going to the cam and the lifters, as the restrictor is after the oil went true the lifter, in fact you slow down the oil bleed true the lifters and the cam going somewhere else and use that additional oil to their own lubrication enhancement.
So now you can take a .050 needless bleed savings per pushrod and use your own calculator and figure out how much peace of mind I been enjoying while you worry about your oil pressure gauge.
But you still not sure, ok do this take a tube of some kind drill a .030 hole in it and put motor oil of your choice true it at only 5 psi see if you can rely in that amount of oil to keep enough lubrication on one rocker arm, cause that is all that oil is going to lubricate ones past true the pushrod.
So did you do the math? the answer is .8
3/8 are 74% stronger then 5/16 of same thickness as measure in crush resistance test.
When ever 3/8 is possible to use must aftermarket ls7 heads are clearance for 3/8 push rods.
Must factory heads are not.
So you say that's a lot of bla-bla-bla, opps this was not for the wicket but for the wise.
Take a .080 restrictor hole and reduce that to .030 do the math, that's 62.5 % more oil flow redirected to your rods and main bearings from that single one push rod along, take that and multiply times 16 pushrods and what do you have? Mucho mas oil going to your engines main and rod bearings
By your calculations, reducing an aready very tiny hole by a little more than half you gain 1000% more oil elsewhere?
I like to use 3/8 x .082 wall with a .030 oil restrictor.
So a restrictor why? the push rods oil restrictor holes are .080 diam. at 35 to 74 psi is way to much oil directed solely to lubricate single rocker arm, even at 5 psi it's way more than adequate or necessary.
So you say that's a lot of bla-bla-bla, opps this was not for the wicket but for the wise.
So a restrictor why? the push rods oil restrictor holes are .080 diam. at 35 to 74 psi is way to much oil directed solely to lubricate single rocker arm, even at 5 psi it's way more than adequate or necessary.
So you say that's a lot of bla-bla-bla, opps this was not for the wicket but for the wise.
I would use a manton 3/8 double taper with .120 wall if you are going to rev it very high. Otherwise .080.