Hi all - I've got a 67 Skylark convertible with a (assumed) 1969 350/350 combo. I'm putting MSD Atomic EFI in it, and need a temp sensor install location. There are two on the intake manifold near the upper radiator hose. One has an aftermarket temp gauge sender, the other has a square head plug. Of course that plug is seized and is pretty well stripping when I try to remove it with a 3/8 extension. Are there any other easy places to install a 1/2" (just a guess) temp sensor?
Apply heat to the plug, not red hot, just hot. Take a candle & let it melt on the plug. Let it sit & cool. What happens is the wax will wick it's way down the threads & once it cools should just about come out with your fingers. IF it's still tight do it again. On a stubborn plug it may take a couple times heating/cooling but it WILL come out.
Thanks guys, will try those suggestions. I've chewed the fitting up pretty well already, so I may weld a socket to it for better grip. I'm a little suspicious that heat/wax will work on something that's been merrily rusting in place for fifty years, but stranger things have happened... Where does the OEM idiot light get its signal?
Should be a another sender in intake coolant passage by thermostat housing . But having an aftermarket gauge I would say that the light is inactive
Thanks team - another quick question - turns out I don't have a PCV valve, just the breather hose from the driver's side valve cover. There's a bold plugging the PCV grommet at the rear of the intake. I suspect this was done because the Edelbrock carb (and MSD TBI as well) only have one 1/4" hose fitting (for the brakes), so the yahoo PO just removed it. Can I use a 1/8" NPT fitting (with 1/4" hose barb) for the PCV valve? Or should I put a T in the brake booster line?
There should be a spot on intake for brake booster. Use the carb fitting for pcv. Keep them separate. You want to avoid any oil seepage into booster. And it’s alittle too much load at one port .
