01-30-2002, 11:30 AM
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CC Member
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Join Date: Feb 2001
Location: Parsippany, NJ USA,
NJ
Cobra Make, Engine: Shelby Mustang with lots of dust, with parts in every room of my house.
Posts: 10
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Not Ranked
Jon,
There is nothing wrong with the stock type rocker arms for a "mild" engine, other than bragging rights. I am assuming a few things: not an extremely high lift cam (lets say 550 lift or less), target shifting rpm around 5400 to about 6000 rpm (above that is not "mild") and new or reconditioned rocker arms. The adjusting nut on used "Original" ford arms often gets loose with age. Adjusting a solid cam on a FE is a distinct pain, so you do not want it to be a more frequent event than required. If you are using a hydro cam, you should only have to adjust once... Remember, Ford used these buggers in NASCAR racing with 600 lift cams. Modern valve train components are better, and look better, but...
I used a set of these in various FE motors with 500ish lift cams for years with no problems (428 to 427HR to 390 - same set).
One upgrade to consider would be to replace the stock spacer springs between the rockers with one of the many solid spacers sold. It usually ends up giving you better valvetrain control and a couple or 3 HP @ about 5500rpm.
I think that the stock 427 engine qualified as a performance engine, 500 lift, 300 advertised duration, RPM range 5500 - 6000 for shifting. (I can not equate the duration to a modern number off the top of my head).
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