I just came across a set of 59 FLH cases. They are very nice. I just have a question regarding the cylinder deck being machined what looks like to be for big bore cylinders. Looks like later on they switched back to stock with these aluminum machine fitted rings. I added pictures so you guys can understand better as to what I'm talking about. I can't confirm why this was done but that's what I think. The engine was parted out and was running before being parted out.
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Panhead bored out cylinder deck?
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Originally posted by Rubone View PostSo what is your question??
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That may be it.
However, it doesn't need to be done.
The stock spigot should be slightly smaller than the iD of the insert, not a snug fit.
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Originally posted by kitabel View PostThat may be it.
However, it doesn't need to be done.
The stock spigot should be slightly smaller than the iD of the insert, not a snug fit.
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The engine may have been built for external drain.
f you use 1948-52 (deck drained) panhead cylinders (with drains in the flange bottoms) you have to drill through the deck down into the case interior,
For 1953-83 cylinders the drains are inside the bore.
The drains in the back of the ring grooves are only for oil removed by the oil ring, not the rocker boxes.
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Originally posted by kitabel View PostThe engine may have been built for external drain.
f you use 1948-52 (deck drained) panhead cylinders (with drains in the flange bottoms) you have to drill through the deck down into the case interior,
For 1953-83 cylinders the drains are inside the bore.
The drains in the back of the ring grooves are only for oil removed by the oil ring, not the rocker boxes.
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Your barrels already have drains that end inside the bore, so the blank flange is harmless.
A stroked motor using those barrels (where the oil ring would travel below the drain at BDC) would need the holes extended down and through the case.
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Because the belly of the cases aren't machined for a bigger wheel. It ran a stock crank.Robbie Knight Amca #2736
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