Posted by LarryM on December 30, 2012 at 13:45:58 from (199.193.96.189):
My Dad overhauled his 450 about 8 years ago and it has never had the horsepower it should. We have recently gone through the carb, governor and ignition but the one thing I do not have the knowledge of is the cam specs. What we have is a cam that on the number 1 cylinder starts to open the intake at about 8-10 deg past TDC. It reaches peak lift at about 98 deg past TDC and stays at peak lift for about 30 deg or until 128 deg past TDC and then starts to close. I did not check to see at what point the intake valve is fully closed. We placed a dial indicator on the top of the #1 intake valve rocker right on the adjustment screw to check this and the total lift was .234". I am hoping that is enough information for someone to be able to tell us if the cam is worn down or not timed properly. What are the specs on an original c-281 cam? One last thing; with the manifold off it has exactly 150 psi compression on all four cylinders running it over with the starter.
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