I guess I should have been more clear in the video. This is not a *rebuild* of this engine. This video was purely to document the internals and show off the original racing technology used inside a Harley CAC. In the future I will be taking this engine apart again and professionally rebuilding it to put it into a running bike. For now, I just wanted to preserve it to prevent any of the rusty & worn areas from getting any worse. Thanks for the support! ✌️

Love these old engines. What a rare find indeed.Great that you showed Billy Lane at the end. His passion for old Harley motors is large.

I'm not a Harley guy at all but this channel is excellent.

I especially liked how you scraped it across the metal table instead of using a mat

I never was into cars and engines but it was pretty cool watching you assemble it and come to life. Well done!

Damn, a great singer and an awesome mechanic, didn't know that 👍

awesome David, cool video as always... glad we got together at last swap meet in quad cities!!!

Very advanced for that time. The rod and rockers are really something along with the double roller bearings on the mains. Thanks.

great job !!!!!

the slugs look new , run it !

I know that engine! Very cool video! Thanks for posting.

Id love to have two,sync'd in line in a frame . What a machine that would be.

I am surprised that you did not check/document the valve and ignition timing as received. Also, no apparent inspection of the magneto.

Looking like a Graveley tractor crankshaft

Pretty decent video, I just hope that when you or whoever fires that engine up in the future will at least either replace those rusty valve springs or disassemble the valve train and polish the springs then check clearances. Everywhere rust is present on a machined surface it should be addressed if someone intends to swing some real rpm’s with that engine. Even if it’s not one of Petralli’s engines it still holds a lot of historical value. Just hope to hear that it receives the attention it deserves. I appreciate you showing us the tear down and partial inspection, hope to see more.

Hey no prob - signature bond and away he goes😊

Interesting video David, I found one of the smaller pea shooter over head valve motors on my farm in an old scrap pile, sadly all the internals of the motor are missing.

No gaskets! do you intend striping it again before fitting to bike ?

The holy grail! Awesome work man 🤙

Thank You for the devastating video David. But...what does CAC stand for?

Why would you polish a cylinder bore? Hone marks provide increased surface area so the oil surface tension can retain the oil on the bore, stopping wear and preventing blow-by.

What was the spot that looked fractured? Casting marks?

Cool vid. Though a remark : rusted valve springs should never be re-used. The pitting caused by corrosion, is an excellent starter of cracks. One customer of mine found out the hard way re-using his mildly corroded springs...... Its a no go. Even touching with bare hands a non lubed spring can already trigger such tiny almost invisible spots.

Wonder if that engine can do subharmonics? 🤔

are you near us We are in Kissimmee Fl

How many kilogams this engine ? Please .

No new gaskets???

I doubt they had chrome bores in the 20's.

if you make it squikey clean inside it will get condensation inside of it and RUST ! , never let a engine just sit ,better to run it ever so often common sence

i think this engine is more than 700 cc

🎶 "Promo SM"

That hole discovery thing was so Fake!

You paid $100,000 for those😮 you don't have anything better to buy with your money, when I was a kid we used to go to a landfill in Summit New Jersey you could find Harley-Davidsons Model A Ford parts brand new in the dump