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Old 09-08-2008, 02:59 PM
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wtm442 wtm442 is offline
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Location: Squantum (part of Quincy), MA
Cobra Make, Engine: SPF1049 Titanium w/black stripes, 351W with Trick Flow Heads, Tremec 3550
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Ron
I looked at that Summit part and it looks like the right one. You want to use the new one in place of the one with idle screws and no provision for power valve. I'd leave the 71's in the primaries, unless you have any smaller ones (65 - 68's maybe). I assume you have not started the engine yet and need to break it in. I'd also install a 65 power valve.

If you have not run the motor yet, I would not go full throttle until at least 30 minutes at about 2800 - 3000 RPM to break in the cam, unless you have instructions for a different type of break in period.

I would also put in some smaller jets (around 74 to 76) in the secondaries during initial start up. You do not want to be too rich on initial start up.

The 800 cfm carb is a little big for your cubes, but it will work.
Good Luck
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