06-29-2006, 11:45 PM
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Join Date: Jun 2006 Location: Troy, MI
Posts: 238
Car: 1988 IROC-Z TBI Engine: L04.3 = 305-310-334 Transmission: TH-700R4 Axle/Gears: 10-bolt, 3.42 posi | 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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