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Original Message
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| Edelbrock Performer RPM Cam |
| By bprewit - 02/23/2004 9:42:28 PM; IP 209.240.162.132 |
I searched this board quite a bit for info on this cam before I bought it but didnt find much info on anyone that had actually installed one so I will add what I found with this cam:
Engine is a 390 bored .060 with C4AE-G heads with larger valves, Edelbrock Streetmaster single plane intake modified by opening up the runners and plenum and a 1" open spacer, adjustable roller rockers, petronix igniton, holley 750 vaccum secondary carb, FPA headers, C-6 transmission with manual valve body and TCI 2500rpm stall, 9" locking rear with 3.70 gears, all installed in a '69 fairlane.
The cam gives me around 6-7hg vacuum at idle with a decent lope. Power starts to come on strong at about 3500rpm with this engine and it pulls hard up to 6200rpm before it starts to fall off. The low vaccum causes problems with the vacuum advance on the distributor and had to connect the vacuum to the carb port below the butterflies instead of the ported vacuum on the metering plate to get the engine to idle. Idle is set around 1000rpm as any lower and the engine wants to die in gear even with the stall convertor. Also the auto tranny original vacuum modulator needs about 12-15hg to work correctly. The TCI modulator is adjustable down to about 8-10hg according to TCI which is still too high for my engine so a manual valve body was required to keep from burning up the transmission due to not being able to adjust internal pressures based on engine torque demand. I dont think there is any way this cam would work with power brakes unless a vacuum can/pump were used. Peak hp and torque are also pretty far up so good valve train and bottom end are necessary I think. Also if you are running a holley carb you will need to change the power valve to one that opens at about 2hg less than your vacuum reading at idle to avoid having the power valve flutter open and closed causing problems with acceleration off idle. I will run the car at the track this coming weekend and try and get back with some quarter mile times with this setup. Great cam for what I was wanting! |
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