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

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

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

That might explain the problems I had when I switched to the Dove rockers.

John, will the custom length pushrods I got from you have the larger cups? I got them a couple years ago and haven't put them in yet.


Lawrenceville, GA

Hey John,

Do you have any original-type adjusters in stock?

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Billerica, MA

If you use high performance adjusters (Harland Sharp, Crane, Crower, Comp, Dove, ect) don't use stock or replacement pushrods.

http://ford-y-block.com 

20 miles east of San Diego, 20 miles north of Mexico

So John, I have your push rods. Do I use my original adjuster screws or do I need true 3/8" after market adjusters?

Thanks.

Mark

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

Matt, the issue with aftermarket adjusters are that they are generally a true 3/8" diameter ball. The cup on aftermarket pushrods are usually a little over 3/8". There must be clearance between the 2 pieces for oil.Unfortunately, the original Ford adjusters were a little under 3/8" and the pusrod cups were true 3/8", or close to it.
When you use A/M adjusters with Y-Block or replacement Y-Block p/r's there might not be any oil clearance between the 2 pieces.
The correct adjusters will measure .365" +- or you must get custom pushrods made.

http://ford-y-block.com 

20 miles east of San Diego, 20 miles north of Mexico

I decided to order both the Harland Sharp AND Crane screws. Will check em out, take pictures, and come back with the verdict.

By the way, I called NAPA and no one could locate factory replacements.

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Billerica, MA

Matt, when you get to the bottom of this it would be appreciated if you could post the outcome. I have at least 2 loose adjuster screws and need to find something that will work.

Mark

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