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Discussion Starter #1
I'm putting an edelbrock 500 CFM carb on my 289 cat, and was wondering if it would be wise to use a carb spacer. From various mustang forums I've heard that 500's are tuned just rich enough for a 289, and I've also heard that installing a spacer requires jetting up your carb for effectively the same tuning. Anyone have experience with this? Would a 500 with a spacer require tuning?
 

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I would always run a phenolic spacer since it help isolate the carb from the heat source......shouldn't make a hill of beans on jetting or anything - that is controlled by what the engine requires due to the airflow and other factors, most carbs are pretty closely tuned to stock out of the box without big changes. If the engine has some big changes you may need to tweak it a tad.
 

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Discussion Starter #3
Thanks! I actually found some time to call Edelbrock today and they told me basically the same thing. Cougar owners are so much smarter than Mustang owners :toung:
 
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