09-05-2022, 09:59 AM
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CC Member/Contributor
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Join Date: Feb 2000
Location: Greenville,
SC
Cobra Make, Engine: 70 Shelby convertible, ERA-289 FIA, ERA 289 roadster hybrid, mystery Ford powered 2dr convertible
Posts: 12,764
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Not Ranked
Quote:
Originally Posted by cobragene
I can blast off in second gear hold the brake lightly and only burn about 30’ then grabs and goes, I hear some can just jab it in 3rd and break them loose, I am lucky to jab it in 1st and break loose if it’s cooler out. FE 428 10:1 780 Holley vac sec open 3/4-7/8 with the lightest spring ,tall oval air cleaner, RPM performer, edelbrock heads, 36 total timing, hyd. Cam .539 280 ,at .050 230 lobe sep 110. 350 gears 29” x12” MT S/R tire, WR toploader. Runs great I just feel I am leaving some on the table, may try to get some Dyno and tune time. The tubes in side pipes are rather small, I guess that would be a good and cheap place to start? Any feed back would be much appreciated.
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Remove 780cfm Holley Vac Sec carb
Replace with 650CFM Holley double pumper-04777C
Try it fresh out of the box, do not adjust carb, do not adjust timing just yet.
In addition, maybe check tire pressure in rear tires, want to burn out more, add additional pressure 
Bill S.
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