Cleaned Manifold, Re man Quadrajet

[joemadrum]

So on this unusually beautiful day in south Florida my father and i went to pick up my 1976 Rochester Quadrajet carb and the, now very clean, original intake manifold for my 1986 regal, which i still think is pretty cool how they used an aluminum intake opposed to steel.

I do have a question with the manifold, why is there a hole in the bottom of it (which I removed a screw out plug from) and when i go to re plug it, should i put sealer on the threads?

Anyways, all is going well with my build and have a great one forum!

-joe

 

[joemadrum]

pic of the carb on the manifold, cant wait for the block comin in next week!

 

[67rstbkt]

Looks real nice My only guess on the hole, and this is a total guess is that maybe it's part of the casting process. I would use some type of sealant on the threads, but once again, just a personal opinion. Maybe someone else will chime in with something a bit more definitive.

 

[joemadrum]

yeah either way a plug came out, and a plug is goin back in, dont really want to mess with anything unless some tells me it will give me more horsepower or something lol.

 

[Minion1186]

That older carb/distributor should make the 307 run like a top, but if you're looking for an improvement on power, something i'm doing is removing the egr discharge passages inside the primary side of the intake where the carb bolts up too, look inside there and you'll see two plug like towers attached to bolts (since your intake was cleaned, there should be holes where the plugs sit. Anyhow, cut the tubes down to the bolt flat so they look like bolts with holes in them, make the top surface flat, what this does to add more of a charge to the front 4 cylinders, adding more midrange power to that 307. Its not the biggest improvement and definitely nothing to brag about power wise but its a cheap way for a little power improvement. This is only if you're still running egr which you should on a stock-ish 307.

 

[olds307 and 403]

Why the chebby style carb? A 76 carb tuned for a 350 should run great on a 307. My 5A 307 ran much better than the way too lean carb it, put on a 403 spec Holley reman. The carb is on the lean side for my 403(car still flies) but ran near perfect on my 307.

 

[Peter]

for yoru answer about whether anything on the threads of the plug on the bottom, i believe you dont put anything on it, just put the plug in

 

[joemadrum]

That older carb/distributor should make the 307 run like a top, but if you're looking for an improvement on power, something i'm doing is removing the egr discharge passages inside the primary side of the intake where the carb bolts up too, look inside there and you'll see two plug like towers attached to bolts (since your intake was cleaned, there should be holes where the plugs sit. Anyhow, cut the tubes down to the bolt flat so they look like bolts with holes in them, make the top surface flat, what this does to add more of a charge to the front 4 cylinders, adding more midrange power to that 307. Its not the biggest improvement and definitely nothing to brag about power wise but its a cheap way for a little power improvement. This is only if you're still running egr which you should on a stock-ish 307.

i know which bolts you are referring to, and as for keeping egr, well no i am removing all emissions/egr stuff off the car and a non computer controlled carb and distributor will be used. so would you still recommend this mod, and why not just get rid of the bolts all together?

thanks
-Joe

 

[joemadrum]

Why the chebby style carb? A 76 carb tuned for a 350 should run great on a 307. My 5A 307 ran much better than the way too lean carb it, put on a 403 spec Holley reman. The carb is on the lean side for my 403(car still flies) but ran near perfect on my 307.

kinda confused with your wording :? but as for a carburetor i am set on the Rochester because it is a better street carb whereas Holley are more performance oriented and Rochester are multi use street/strip, especially a 76 Q-J which was one of the best years for this carb. and i only paid $170 for it so im happy 🙂

 

[olds307 and 403]

Side fuel inlet Q Jet's were used mostly on chevy motors. The Olds used the front inlet, mostly. I have used the side inlet and the fuel line was a pain to run around the thermostat. I only have really run Q Jet's, I have modified a few for my 403. The carb's in the post above were Q Jet's. The TBI on my 4x4 is also very nice.