To those with cams.

[AaronGTR]

No way. If you use a rocker arm like the gold race rockers, you can get full lift using different lengths. The problem is the contact point and how it sweeps across the valve stem tip.

Well, yes since it's adjustable thats true. Let me refrase that. He's not using adjustable rockers, he's using stock rockers, so they are a fixed height and if he doesn't add the length to the pushrods he WILL lose valve lift. That was his original concern and question, not where the contact point on the valve stem was.

[sprucegagt]

Well, yes since it's adjustable thats true. Let me refrase that. He's not using adjustable rockers, he's using stock rockers, so they are a fixed height and if he doesn't add the length to the pushrods he WILL lose valve lift. That was his original concern and question, not where the contact point on the valve stem was.

Both problems correlate with each other regarding fixed height rockers. If the length isn't set right then yes you will lose valve lift with shorter than required pushrods.

But that's not what Ben was asking.

[3400-95-Modified]

Stock shortest rod is, 5.747, so that checker is just a shade too long for a stock camand rocker setup, and may be too long to do Milzys cam as well.

Smith Brothers is sending me an adjustable pushrod that will work to check both... so Hopefully it is shorter than 5.8 to begin with... if not I'm not sure how easily I will get 0 lash or if I can even get that with what he sends, but he knows what I am starting with, what the base circle loss is and what I need to do so hopefully he has a custom one made that will work.

His was only 11 bux btw...

BUT yes as Aaron noted I do not have adjustable rockers so I can't take up the slack there and I figured I need to take it up in the pushrod length, since that’s the only area I can physically add material to the valve train and would make it so the rocker ends up in the same location as stock on the valve and it will have the proper preload.

My adjustable pushrod will be here Tuesday; I'll snap some pics and post them along with its measured shortest length and longest one.

Also my heads should be done today... I gotta call on that one though.

[AaronGTR]

Worse comes to worse, I wouldn't think it would be too terribly hard to take a stock pushrod and make an adjustable pushrod out of it for checking length. Maybe cut it in the middle and thread it and put a bolt with the head cut off in the middle?

[3400-95-Modified]

yeah you could probably do that

[rickykline]

so whats the verdict guys?

[3400-95-Modified]

I got a 5.7 length adjustable pushrod from pushrods.net so I can use that when I put it together to determine the 0 lash length and then just add .030 to that and I'll be good to go.

[sprucegagt]

Wouldn't you need 2 adjustable pushrods since there are 2 different pushrod lengths?

[jackal2000]

Wouldn't you need 2 adjustable pushrods since there are 2 different pushrod lengths?

no? only 1 pushrod per rocker and you can check them separately. correct?

[SappySE107]

If it does the range, you can use one for both. You dont need to test them at the same time.

[sprucegagt]

I mention it because of the way pushrod manufacturers estimate your pushrod length. You can't just measure from ball tip to ball tip and say that's the true total length because of the oil hole and its chamfering. Instead most manufacturers recommend you get the correct length you need from the adjustable pushrod and send it to them, so your sure to get the correct length.

[3400-95-Modified]

Well smith brothers sent me ONE pushrod that is adjustable and will fit the range... I can use the exact measurement from his pushrod to tell him how long to make mine since he does know the ball end condition as far as how big the oil hole is along with its chamfer... IIRC the one he sent is actually flattened on both sides as if there was a oil hole in it.

Granted if you use a checker from one company and give another company the length it may not come out right. That part I can understand.