06-29-2020, 04:48 PM
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CC Member
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Join Date: Jan 2020
Location: Raleigh,
NC
Cobra Make, Engine: Superformance, '65 427/MKIII with Roush V8 - 351W w/770cfm 4BBL Holley, 514hp
Posts: 48
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Not Ranked
Hi Matt ... I have a 770cfm Holley on a Roush 427SR (even though the valve cover is 427R !!).. my Carb is identical to yours.. 2 mixture screws in the front (passenger & driver side) .. none in back... That's Normal.. nothing to worry about.
Note .. I have a solid rod linkage so my pedal moves precisely when the carb accelerator moves.. The suggestion to ensure your Return Spring is Stiff Enough to always return the carb accelerator is a geat suggestion.
Additionally as several already mentioned if you have a Mechanical Advance clean the springs and levers. I just replaced my MSD Disty Cap & Rotor as they were in terrible shape. 21k+ miles on them and never replaced by the prior owner! In the process I cleaned the Mechanical Vacuum springs/arms under the Disty Cap as a preventative measure ....
Good luck and hang in there..
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Many thanks,
Mark
Superformance: SPO2454 , Titanium w/Black Stripes
Engine: Roush 427SR w/770cfm 4-Barrel Holley
Transmission: Tremec TKO-600
Last edited by Moritz55; 06-29-2020 at 04:57 PM..
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