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Originally Posted by
Jeff Kleiner
Jay,
Your current Performer RPM Air Gap #7581 has a carb pad height of 5.75" and RPM range of 1,500-6,500.
The Performer RPM #7181 has a pad height of 4.8" and the same 1,500-6,500 RPM range
The Performer #2181 has a pad height of 4.120" and RPM range of idle to 5,500. Given your intended use of the car, complaints concerning low speed drivability as well as the hood clearance issue I think this is the direction I'd go.
Talk to you soon!
Jeff
Jeff - You are THE MAN!!
I have the same setup as Jay with a very tight fit under the Hood and the Body. I also had the really severe bucking at low RPM's with the 7581 and the Holley EFI.
I swapped out the 7581 for the 2181 plus a 1" spacer to get over the top of the distributor and everything is soooo much better.
The car will now cruise along at 5 mph/900 RPM without touching the gas with only very mild surges. Before I would need to speed up and coast to go that slow.
I also don't notice any difference in the top end as the tires still give well before the HP does.
There will be a few dozen tokens of my appreciation in the trunk when my car comes to you for paint.
Thanks!
Richard
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