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  #61  
Old 06-20-2021, 08:13 PM
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67gtospud 67gtospud is offline
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Originally Posted by AG View Post
Heat range looks good but they look like you are rich.
Would that be from the extended idle time? Otherwise I considered going down a jet size and up a rod size to lower the effective surface area in cruise by .003". I'm hoping this helps my cruise issue where I have to give the ever slightest throttle to keep a happy afr

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1967 GTO, 432 (428+.030), 4-bolt mains, factory Nodular crank, scat rods, icon dished pistons, Lunati HR 243/251@.050, .618/.622 lift, Edelbrock 72cc round port heads, 10.5:1, offy 2-4 intake, Edelbrock 650cfm carbs, Super T10 trans (2.64 first), BOP 10 bolt w/ Eaton posi and 3.36 gears
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  #62  
Old 06-20-2021, 09:32 PM
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It could be, or it just shows the state of your idle tune. For my street car I have it tuned for a 14.4 AFR at steady cruise with a Qjet and I got the best ET for my racecar at an AFR of 13.0 at WOT. I would try what you want to do and see how it responds, cruise can be quite lean and run well.

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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
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