77Matt
Member
- Joined
- Mar 21, 2024
- Posts
- 46
- Reaction score
- 19
- Location
- TO, CA
- First Name
- Matt
- Truck Year
- 1977
- Truck Model
- C15
- Engine Size
- 5.7L 350 V8
1977 GMC C1500 Heavy Duty 350 V8 failed smog due to extremely high HCs
I am swapping out the the 4MV Qjet for the Edelbrock 1400 and need help with th vacuum lines. Pic 1 is what the set up should look like. Pic 2 is the current setup with the Qjet. The PCV and canister have dedicate connections to the carb. There are two remaining ports available on the Edelbrock, 1 manifold and 1 times/ported. If I keep the current configuration, what goes where? I color coated and numbered the vacuum lines I’m unsure of. Number one goal is to pass smog test. I will address power and fuel efficiency once smog is taken care of. I’m adding a 3rd pic of what I believe is the ‘spark control switch’ (red arrow) and ‘control valve’ (blue arrow) in case I am wrong (maybe it’s EFE?). What is the best configuration to pass smog? Note- heavy duty did not have EGR systems or Cats. If it doesn’t smog after this, I will take the advice in a different thread and put on a couple cats (dual exhaust) - the truck needs headers anyways. Thanks in advance
I am swapping out the the 4MV Qjet for the Edelbrock 1400 and need help with th vacuum lines. Pic 1 is what the set up should look like. Pic 2 is the current setup with the Qjet. The PCV and canister have dedicate connections to the carb. There are two remaining ports available on the Edelbrock, 1 manifold and 1 times/ported. If I keep the current configuration, what goes where? I color coated and numbered the vacuum lines I’m unsure of. Number one goal is to pass smog test. I will address power and fuel efficiency once smog is taken care of. I’m adding a 3rd pic of what I believe is the ‘spark control switch’ (red arrow) and ‘control valve’ (blue arrow) in case I am wrong (maybe it’s EFE?). What is the best configuration to pass smog? Note- heavy duty did not have EGR systems or Cats. If it doesn’t smog after this, I will take the advice in a different thread and put on a couple cats (dual exhaust) - the truck needs headers anyways. Thanks in advance