08-20-2002, 08:02 PM
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CC Member
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Join Date: Jul 2002
Location: Rockford MI,
Posts: 55
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Not Ranked
Cam Timing
I am timing my cam. It is a M-6250-C460 Ford motorsports cam.
.595 int. lift , .621 exh. lift, 310 & 320 duration w/95 duration.
Using a Cloyes roller chain. It has three key positions, at 2 degree increments.
Cam card says at .006 lift, int. should open at 48 deg. and close
at 82.
The closest I could get was open at 47 and close at 79. This was achieved at the retard setting on the small gear.
Each move of the keyway changed 5 degrees, not 2 degrees as the manufacture stated. Is this a result of the higher duration?
Exhaust side had similar results. Seems the actual duration is less than stated by Ford? Lift was very close to advertised.
Has anyone else had much experience with really looking at cam
timing? I have build four other motors as a kid, just lined up the dots and let it go. Turbo VWs (2) and a couple...well lets just say other V8s. Dan
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