Got both the Crane and Harland Sharp adjuster screws in today. Turns out the Crane screws fit perfectly! The Harland Sharp screws do not. They are closer to a true 3/8", as John Mummert suspected. It is surprising because both the Crane and Harland Sharp screws are advertised to fit the same application (Ford FE), and both are advertised as 3/8" ball ends. However, and fortunately for us, the Crane screws do indeed have slightly smaller balls, nearly identical to factory y-block balls. They seat in the y-block pushrod cups perfectly!

The other positive about the Crane screws is that they are significantly less expensive than the Harland Sharp ones. The Crane screws are ~$50 while the Harland Sharp screws are ~$130. Both have allen socket ends. Both come with jam nuts. Both are well made.

We now know that the Crane screws part #99680-16 are a drop in replacement for factory y-block adjuster screws. I will be putting the Harland Sharp screws back in the mail. Can't wait to get this engine wrapped up!

Crane on left, factory y-block in middle, Harland Sharp on right.



Crane screw:



Factory y-block screw:



Harland Sharp screw:



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Billerica, MA

Good work Matt. I assume they thread into the rockers nicely. My interference fit Ford rockers are very tight,except for the two that are loose.

Thanks

Mark

1956 Mercury M100
1955 Ford Fairlane Club Sedan
Delta, British Columbia

Both the Crane and Harland Sharp screws physically thread into the rockers just fine. No noted looseness or anything funky.

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Billerica, MA