PONTIAC1953 Posted December 26, 2022 Share Posted December 26, 2022 Hi, which vacuum source was used for distributor vacuum advance on the Rochester 4gc aka 4jet ?, on the rear of the throttle plate or the right front corner of the throttle plate ?, thank you in advance. Link to comment Share on other sites More sharing options...
joe_padavano Posted December 26, 2022 Share Posted December 26, 2022 The front goes to the distributor. The back goes to the PCV valve. 1 Link to comment Share on other sites More sharing options...
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