Stock Rochester 220 and the "bored out" modifications
TBIThrottle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.
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Stock Rochester 220 and the "bored out" modifications
...just out of interest.
A guy at CFM Tech told me that the stock Rochester 220 flows 490 cfm with the injectors in place. He also said that the modified 220s, with 1 13/16" bores, flow 600 cfm and 620 cfm with an injector pod spacer. That's at 1.5 inHg.
Sounds reasonable, since the 1 13/16" bores have a 15 percent greater area than stock and the ridge at the top of the bores are machined down.
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