460 timing/idle problems
Fleet Mechanic
Joined: Mar 2004
Posts: 1,398
Likes: 17
From: Hesperia, CA
This came straight off of the Crane Cams website. Maybe it would be helpful.
How does Advancing or Retarding the camshaft's position in the engine affect performance?
Advancing the cam will shift the basic RPM range downward. Four degrees of advance (from the original position) will cause the power range to start approximately 200 RPM sooner. Retarding it this same amount will move the power upward approximately 200 RPM. This can be helpful for tuning the power range to match your situation. If the correct cam has been selected for a particular application, installing it in the normal "straight up" position (per the opening and closing events at .050" lifter rise on the spec card) is the best starting point
I would start with the timming chain. From the factory it came with 8 degree retard built in to help smog testing. If you get a pre 72timming chain then you would be fine. Some people say as much as 35 hp with no loss in milage and some has reported in incress in milage.
How does Advancing or Retarding the camshaft's position in the engine affect performance?
Advancing the cam will shift the basic RPM range downward. Four degrees of advance (from the original position) will cause the power range to start approximately 200 RPM sooner. Retarding it this same amount will move the power upward approximately 200 RPM. This can be helpful for tuning the power range to match your situation. If the correct cam has been selected for a particular application, installing it in the normal "straight up" position (per the opening and closing events at .050" lifter rise on the spec card) is the best starting point
I would start with the timming chain. From the factory it came with 8 degree retard built in to help smog testing. If you get a pre 72timming chain then you would be fine. Some people say as much as 35 hp with no loss in milage and some has reported in incress in milage.
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Hey folks, I installed the Ford Motorsports timing chain and gear set straight up. It did not help with the timing but the response seems better???? I drilled 1/8 holes in my primaries and after readjusting the carb my manifold vacuum is up to 10 and my timed port vacuum is 0. The engine is running better. Still considering a new distributor. Thanks for all of the help with this.
Fleet Mechanic
Joined: Mar 2004
Posts: 1,398
Likes: 17
From: Hesperia, CA
Originally Posted by 1ford1
Hey folks, I installed the Ford Motorsports timing chain and gear set straight up. It did not help with the timing but the response seems better???? I drilled 1/8 holes in my primaries and after readjusting the carb my manifold vacuum is up to 10 and my timed port vacuum is 0. The engine is running better. Still considering a new distributor. Thanks for all of the help with this.
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Joined: Apr 2006
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If I remember correctly his duration at .050 is 244. That would cause low vacuum. If you know how to get into the distributer and weld up the advance slot the Duraspark is good. If not the MSD is easier for the more novice.
Senior User
Joined: Apr 2006
Posts: 122
Likes: 0
Originally Posted by 1ford1
Hey folks, I installed the Ford Motorsports timing chain and gear set straight up. It did not help with the timing but the response seems better???? I drilled 1/8 holes in my primaries and after readjusting the carb my manifold vacuum is up to 10 and my timed port vacuum is 0. The engine is running better. Still considering a new distributor. Thanks for all of the help with this.
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