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ACCURATE Tech Tip

Lifter Block Drain Holes for Panheads and Shovelheads

By the Accurate Engine Master Berry Wardlaw
10/21/2018


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Accurate Engineering, Pan and Shovelhead Engine Masters. The 5-Ball racing team set two World Land Speed Records with Berry's 120-inch Panhead engines.
Accurate Engineering, Pan and Shovelhead Engine Masters. The 5-Ball racing team set two World Land Speed Records with Berry's 120-inch Panhead engines.





Here is a hopefully helpful tip for you Panhead and Shovelhead owners or technicians.

Drain Holes == Both pushrod drain holes are small to begin with and then go into a common Y and slows the oil down from getting back into the crankcase.
Any build up in these holes only makes matters worse. = Pushrod covers leak

If you note the final photo there are now 2 - 1/8 drain holes. Each pushrod has its own larger drain and oil gets back to the crankcase quickly.


Small Single Hole
Small Single Hole



When servicing the lifter blocks, observe the drain holes. If they are the small, single hole as pictured, drill them out as I have done, using an eighth inch (1/8") aircraft extension bit.

Drilling Oil Passage
Drilling Oil Passage



Why the special bit? Because it is longer than a standard bit and will keep you from jamming yer' dang drill chuck into the lifter block, tearing up your customers chrome or paint.

Drilling oil passage
Drilling oil passage



Yes, using a standard drill bit, you can just put the tip in (apologies to DAC) the chuck but you risk breaking the drill bit when you hit the compound intersection of the two holes and buggering up the finish. Take your time, let the drill bit do the work.

This is how lifter blocks will look after drilling
This is how lifter blocks will look after drilling




Make your Mother proud.
 
 
The Master himself, Berry Wardlay.
The Master himself, Berry Wardlay.



http://www.accurate-engineering.com/

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