Hi all,
I run a chevy 355ci all old school in an 85 transam with stock th700r4 tranny and stock converter. I'm getting now 25l/100kms in city driving being very gentle. I wanna try to tune the holley 750 4160 vacuum secondaries I have on this engine to get a better gas mileage so here is what I was thinking to do if you could tell me if that would help or be worse etc...:
-Move the distributor vacuum advance from ported to manifold vacuum ( should I then back the distributor to avoid to much advance??
-Put a spring in the vacuum secondaries housing that opens at the highest rpm ( maybe the black spring)
-Put a wire in the IFR (Idle feed restrictors)to limit the opening.
-Leave the 67 actual main jets.
-Tune then the carb with a vacuum gauge to get the highest RPM.
Thanks guys!
I run a chevy 355ci all old school in an 85 transam with stock th700r4 tranny and stock converter. I'm getting now 25l/100kms in city driving being very gentle. I wanna try to tune the holley 750 4160 vacuum secondaries I have on this engine to get a better gas mileage so here is what I was thinking to do if you could tell me if that would help or be worse etc...:
-Move the distributor vacuum advance from ported to manifold vacuum ( should I then back the distributor to avoid to much advance??
-Put a spring in the vacuum secondaries housing that opens at the highest rpm ( maybe the black spring)
-Put a wire in the IFR (Idle feed restrictors)to limit the opening.
-Leave the 67 actual main jets.
-Tune then the carb with a vacuum gauge to get the highest RPM.
Thanks guys!