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Switched to full roller rockers and now it looks like my pushrods are a little to long. Is this acceptable or do I need to change them. This is the mockup photo of where the roller is on the valve stem after a couple rotations
Roller lifters are how much taller than flat tappet?
That will be the reason you have to buy new pushrods.
It's called "hidden costs" that someone forgot to mention when going to roller cam.
Do Not Use the Longer Pushrods.
Damage will occur.
As stated above, buy the pushrod measuring checker.
Roller lifters are how much taller than flat tappet?
That will be the reason you have to buy new pushrods.
It's called "hidden costs" that someone forgot to mention when going to roller cam.
Do Not Use the Longer Pushrods.
Damage will occur.
As stated above, buy the pushrod measuring checker.
That pattern is not acceptable.
This is the pattern you are looking for:
If you rotated the engine a couple times, and the pattern is that narrow, you are good to go.
It does not have to be dead center, but must NOT be near an edge.
It should be in the middle 50% zone, not at the 25% area on either side.
A wider pattern will give you more valve guide wear, a narrow one less, but you are talking after 30-50k miles or so.
Valve guide wear is one of the earliest wear points on a higher mileage SBC engine.
BUT the rollers themselves already cut down a lot of that sideways thrust, so there is really no need to worry.
Internet myths abound.
And because of that, you will likely get many various opinions.
If you rotated the engine a couple times, and the pattern is that narrow, you are good to go.
It does not have to be dead center, but must NOT be near an edge.
It should be in the middle 50% zone, not at the 25% area on either side.
A wider pattern will give you more valve guide wear, a narrow one less, but you are talking after 30-50k miles or so.
Valve guide wear is one of the earliest wear points on a higher mileage SBC engine.
BUT the rollers themselves already cut down a lot of that sideways thrust, so there is really no need to worry.
Internet myths abound.
And because of that, you will likely get many various opinions.
Not a myth. I learned it the hard way. Been there done that.
These other things you absolutely must check: (with a non stock cam or valvetrain)
The retainers can not hit the seals at full valve lift, and must have have some clearance room to spare
Normal rocker slots can not bottom out
The roller rocker slots can not bottom out
The fatter roller rockers can not touch the retainer edge
The edge of the roller can not touch the edge of the valve stem
Pushrod tips can not bottom out on the inside edge of the pocket in the rocker
The pushrods can not touch the heads in the side of the holes
The pushrods can not have sideways pressure on them in the guides, they should almost rattle loose there, if you have a light checking spring
You must check every one, not just a couple
There may be more, but those are all critical, and missing one will more than likely cause bent pushrods, at a minimum.
Adjusting the above can get very involved, but is 100% necessary.
I have witnessed all of the above errors. Usually not pretty.
Last edited by leigh1322; Oct 10, 2024 at 10:15 PM.
Pushrod length
That pattern is not acceptable.
