LA Engine Pre-oil Tool "Stop" Locations

• Aug 25, 2025

• #1

Dibbons

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Now that I have a DIY timing tape on the 340 and a pre-oil tool, does anyone know where the cams needs to stop per crank degrees to send oil to each bank of of rocker shafts? Just trying to avoid unnecessary stops as I rotate the crankshaft to send oil to the lifters and valves. Thank you.
"

 

• Aug 25, 2025

• #2

toolmanmike

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Dibbons said:

Now that I have a DIY timing tape on the 340 and a pre-oil tool, does anyone know where the cams needs to stop per crank degrees to send oil to each bank of of rocker shafts? Just trying to avoid unnecessary stops as I rotate the crankshaft to send oil to the lifters and valves. Thank you.
"

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Wouldn't it be neat if there was an industry standard for where the oil holes were drilled on every cam. I doubt that it was the case though. They may be in the same place for a particular manufacturer. Spin the oil pump and turn the engine over slowly until you get oil to the top.

 

• Aug 27, 2025

• #3

dvw

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Just rotate slowly by hand until you see oil on one side. Once it oils well, rotate slowly until the other side oils. Pretty easy
Doug

 

• Aug 27, 2025

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Dibbons

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I got lucky oiling the driver's side, the rocker shafts filled the first time I spun the drill.

However, I almost burned my drill up searching for the sweet spot for the passenger side but finally it filled also.

I am using an Oregon Camshaft. It appears the passenger side rocker shaft filled at about 160 degrees Before Top Dead Center and the driver's side at about 50 degrees Before Top Dead Center (but please don't quote me on that).

 

• Aug 27, 2025

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ckessel

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I do the same as Doug. While spinning the tool, rotate the engine over slowly, plugs out, for several crank rotations. Once you're done with that, get the vc off the lh side, watch your rockers as you rotate the crank, after intake #1 closes, look for your timing mark, when it lines up on zero stop. Set your shaft where it needs to be pointing, drop the distributor in with the rotor on #1 tower, advance a touch and you're ready.