Intake and Vacuum Concerns
#1
Intake and Vacuum Concerns
Hi All,
Tracked down a vacuum leak to the intake manifold and the carb base gasket so tonight I removed them, cleaned all mating surfaces and put new gaskets and sealant. For the valley pan gasket, the dimple locators were really pissing me off but I had them where I wanted and I placed the intake on after putting sealant around the ports. My OCD is worrying that maybe one of those dimples popped out a bit but all of my bolts went in smooth with no obstructions. Is it safe to put my mind at ease that as all the bolts went in smooth that the dimples held and my pan didn't shift at all?
As to the vacuum portion, I wanted to get an idea as to what others are set up like. It's a stock 350 automatic with AC, points dist and stock cam. Valve train setup was changed to Comp Cams and the intake is an Edelbrock Performer with a QJet 4 bbl. I bypassed my TCS solenoid and am running dist advance directly to the ported vacuum port on the front of the carb. However, currently it's removed all together and capped as I'm in the process of setting/adjusting timing. Other than that, I have the trans line running to a tee fitting which is then going to the TVS tree at the front passenger side of the manifold and the other side of the tee is going to a port on the intake runner of the manifold. Everything else is either capped or plugged. I don't have a brake booster yet and there are no other connections. It's fairly minimalistic at this point and I want to make sure I'm not missing something or routing something incorrectly. Thoughts?
Tracked down a vacuum leak to the intake manifold and the carb base gasket so tonight I removed them, cleaned all mating surfaces and put new gaskets and sealant. For the valley pan gasket, the dimple locators were really pissing me off but I had them where I wanted and I placed the intake on after putting sealant around the ports. My OCD is worrying that maybe one of those dimples popped out a bit but all of my bolts went in smooth with no obstructions. Is it safe to put my mind at ease that as all the bolts went in smooth that the dimples held and my pan didn't shift at all?
As to the vacuum portion, I wanted to get an idea as to what others are set up like. It's a stock 350 automatic with AC, points dist and stock cam. Valve train setup was changed to Comp Cams and the intake is an Edelbrock Performer with a QJet 4 bbl. I bypassed my TCS solenoid and am running dist advance directly to the ported vacuum port on the front of the carb. However, currently it's removed all together and capped as I'm in the process of setting/adjusting timing. Other than that, I have the trans line running to a tee fitting which is then going to the TVS tree at the front passenger side of the manifold and the other side of the tee is going to a port on the intake runner of the manifold. Everything else is either capped or plugged. I don't have a brake booster yet and there are no other connections. It's fairly minimalistic at this point and I want to make sure I'm not missing something or routing something incorrectly. Thoughts?
#2
You can remove the TVS and run you trans vacuum direct to the manifold port. Also you can run your vacuum advance to the manifold vacuum port on the carb and then readjust your idle speed down to what it needs to be. You won't know about your intake until you start the engine and you have no coolant, oil, or vacuum leaks.
#3
You can remove the TVS and run you trans vacuum direct to the manifold port. Also you can run your vacuum advance to the manifold vacuum port on the carb and then readjust your idle speed down to what it needs to be. You won't know about your intake until you start the engine and you have no coolant, oil, or vacuum leaks.
#4
One fitting is considered manifold vacuum and should have vacuum at all times. The other is ported and should have next to or nothing at idle. If your raise the rpm with the throttle as soon as you are out of the idle circuit you should have the same as the other port.
#5
One fitting is considered manifold vacuum and should have vacuum at all times. The other is ported and should have next to or nothing at idle. If your raise the rpm with the throttle as soon as you are out of the idle circuit you should have the same as the other port.
#7
Thanks again for the help. Turned out to be the gasket. I took it off and did a small amount of surgery to it to prevent it from blocking the inlet at the bottom of the baseplate. Now I'm pulling a steady 12 inches at that port.
#9
You had to burst that bubble huh?...kidding.
Ok so if I only have a couple of vacuum connections and those are not leaking, I've sprayed starting fluid around the intake and base gasket (both just replaced) and found no leaks, what other things should I check for?
Ok so if I only have a couple of vacuum connections and those are not leaking, I've sprayed starting fluid around the intake and base gasket (both just replaced) and found no leaks, what other things should I check for?
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