Posted by Mavman (IP: 204.181.93.77) on February 23, 2000 at 12:31:06:
In Reply to: Performer RPM posted by Charlie on February 23, 2000 at 10:49:09:
PERFORMER 289 (IDLE-5500 RPM)
Designed for street 289-302 c.i.d. Ford V8s without EGR. #2121 is stock replacement/street legal part for 289 and 302 V8s with OEM 4V carb.; 1966-72 (1973 non-CA); except stock equipped EGR. Will not fit „Boss 302¾ or 255 c.i.d. V8s. Aftermarket 4-bbl carburetors not compatible with Ford Automatic Overdrive Transmission (AOD).
PERFORMER RPM 302 (1500-6500 RPM)
Designed for street 289-302 c.i.d. Ford V8s. This dual-plane high rise manifold has high rpm power while retaining throttle response. #7121 is stock replacement/street legal part for Shelby Mustangs with 289 c.i.d. V8 with OEM 4V carb; 1965-66. No provisions for exhaust heated choke. .
Manifold Height: A-4.30", B-5.50"
Supposedly the RPM is a stock replacement for the Cobra Intake.
Hope this helps.