L.A. Built 70 Z28/Smog

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TDW · #1 03-07-2006, 06:57 PM

1970 Z28 Carburetor (780 cfm Holley) A/T List 4490 GM # 3972120
4 Spd List 4555 GM # 3972121
A/T w/NB2 List 4554 GM # 3972122
4 Spd w/NB2 List 4489 GM # 3972123

This is from www.nastyz28.com

I spent a lot of time trying to figure all this out about the CA emissions. The 4489 has a different front bowl than the 4455.

70 Forest Green Zee · #2 03-08-2006, 02:19 AM

My Calf built 70 Z has the M21 4 speed and the carb # is 4489. part # is 3972123

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