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Old 04-11-2010, 05:43 PM
red65mustang red65mustang is offline
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eric,
you did mount a 4 hole 1" spacer right???

rpm intake is a dual plane,,,that means each piston intake stroke sucks from only half the total intake volume area and pulls fuel from only one primary venturi for max Hg...

a 4 hole spacer maintains the dual plane design because the intake divider wall seperation under the carb is kept intack,,,usually won't cause a sputter condition....

a open (one big hole) spacer creates a huge air vacuum leak right under the carb so that now each piston on intake stroke is trying to pull from the entire intake area volume and is trying to pull a vacuum from both venturis=half the Hg pulse signal to each...

a open one hole spacer can cause sputter at idle...

the rpm intake is already a high rise/long runners design,,,you don't really want/need to make the runners longer and add more area volume with a spacer...
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