ls1 pushrod length

[macca_779]

Stock length. Not stock rods sorry

[brad hsv]

Wind rocker down to zero lash where the rocker doesn't rock anymore then measure how far down the bolt/rocker goes until it locks up. 3/4 turn = 40 thou
Seems like you are over complicating it mate as I said with 40 thou off normally only going down as far as 7.350 with a 40 thou head gasket. But does depend on lifters used as some are taller.
But makes your job easier with the adjustable pushrod takes your guess work out of it

well i did what u said and have come up with 1 1/2 or just over turns is this ok

[peter b]

With what length pushrod?
Or is that using stock length?
It's not terrible but would like to see where you would end up with 7.375 pushrod

[brad hsv]

With what length pushrod?
Or is that using stock length?
It's not terrible but would like to see where you would end up with 7.375 pushrod

Thats with a 7.393 pushrod

[peter b]

Ok and this is why I mentioned the adjustable pushrod as can change the length and can then measure preload etc and get the right length pushrods. Ultimately your aiming for 3/4 of a turn after zero lash

[JezzaB]

I've been taught an alternate way to check geometry. Mark the valve stem with permanent marker. Install a rocker on it. Motor it over a few times. Remove rocker and check swipe area. It should be central with the right rod length. If its to low the rod is to long. To high and its to short.

This illustrates when it's good. In my case. Stock rod. But .040" off the head. .600" lift cam

Thats ok with stock rockers but use something like T&D etc and you must set the geometry up first (shim or machine the stand to adjust for the pivot height in relation to the valve tip) then setup the preload and swipe. Mr Young will confirm this

[macca_779]

Thats ok with stock rockers but use something like T&D etc and you must set the geometry up first (shim or machine the stand to adjust for the pivot height in relation to the valve tip) then setup the preload and swipe. Mr Young will confirm this

Yep. That's a no brainier Jez. But I probably should of mentioned it for those reading.

[peter b]

Something interesting for those interested back to back checking stock rocker versus T&D both 1.7 ratio or advertised as that anyway the factory were spot on T&D were 1.74. Not a big problem by any means but have found another issue I have with the T&D rockers is the pivot angle it ramps it up so to speak. Compared with jesel sportsmans rockers our piston to valve clearance changed dramatically as with a few other things like the need to shim up the t&d's where as the jesel didn't need shims and the jesel rockers kept the pushrods central where T&D dragged them into the head.
With adjustable rockers all you really care about in regards to setting length is swipe as you set either your lash or preload through the adjuster.