Is this a smog set up?

66 Racer · 10-08-2001, 04:32 PM

Hey guys,

I was looking at my car the other day, it had the smog junk taken off but i was wondering about this hose coming out of the carb spacer into the valve covers on the engines right side(passenger).

I was wondering if i could plug the carb spacer up and then put a breather cap in the covers and get more performance. Will this make a bit more flow into the engine or will it basically do nothing different.

Also, do i really need the vacum line going into the distributor? I have seen some cars that dont have one. What is the difference?

I guess a quick question that hopefully you guys can save me the expense of a mechanic. Latly the car has smelt like gas inside the car. I dont have the rubber fitting that hugs the throttle linkage going into the car, but its WAY more noticable than before. It doesnt look like the actual fuel lines are leaking, i think it might be in the carb somewhere. Can you guys give me a few prcedure so that i can trouble shoot this. I did notice my intake looking a little wet in front of the car, almost looks like it is leaking fuel from inbetween the spacer/intake. The thing is that it hasnt evaporated though. My assumptions are based on the LITTLE i know about engines. lol, im in my quest of becoming a car guy with my 66, trying to learn off it, and doing as much work on it that i can possibly do w/o going to the shop.

Thanks for any help guys

------------------
Under Construction 66 Coupe
-289 V8 - 600cfm Holley -Tri-Y Headers - Flowmaster 2.5 dual exaust, Centerforce Dual Friction

Rev · 10-08-2001, 07:41 PM

'66, the hose going from the spacer to the valve cover is for the PCV valve (positive crankcase ventilation valve). This needs to stay intact for emission purposes and won't cost you any power. You do need to change the PCV valve occasionally (25,000 miles?). Make sure the hose and connections are good as you don't want any vacuum leaks.

The wetness under the front of the carb is from (1.) the accelerator pump leaking or (2.) the float bowl leaking. Either of these accounts for you smelling gas. It evaporates easily from the hot intake manifold and filters into passenger compartment where you smell it.

If your car has a vacuum line to the distributor, then you need to keep it. Make sure the line and connections are in good shape. Again, you don't want any vacuum leaks. Some performance distributors have only centrifugal advance (my Mallory Unilite is one of these). That costs some mileage as you don't get early vacuum advance when you put your foot in it at lower RPM. If I replace that distributor, I'll definitely get vacuum advance.

Hope this helps with the questions a little.

Rev

------------------
'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.

[This message has been edited by Rev (edited 10-08-2001).]

[This message has been edited by Rev (edited 10-08-2001).]

10-08-2001, 04:32 PM	#1
66 Racer Registered Member Join Date: Jul 2001 Location: West Covina, CA Posts: 77	Is this a smog set up? Hey guys, I was looking at my car the other day, it had the smog junk taken off but i was wondering about this hose coming out of the carb spacer into the valve covers on the engines right side(passenger). I was wondering if i could plug the carb spacer up and then put a breather cap in the covers and get more performance. Will this make a bit more flow into the engine or will it basically do nothing different. Also, do i really need the vacum line going into the distributor? I have seen some cars that dont have one. What is the difference? I guess a quick question that hopefully you guys can save me the expense of a mechanic. Latly the car has smelt like gas inside the car. I dont have the rubber fitting that hugs the throttle linkage going into the car, but its WAY more noticable than before. It doesnt look like the actual fuel lines are leaking, i think it might be in the carb somewhere. Can you guys give me a few prcedure so that i can trouble shoot this. I did notice my intake looking a little wet in front of the car, almost looks like it is leaking fuel from inbetween the spacer/intake. The thing is that it hasnt evaporated though. My assumptions are based on the LITTLE i know about engines. lol, im in my quest of becoming a car guy with my 66, trying to learn off it, and doing as much work on it that i can possibly do w/o going to the shop. Thanks for any help guys ------------------ Under Construction 66 Coupe -289 V8 - 600cfm Holley -Tri-Y Headers - Flowmaster 2.5 dual exaust, Centerforce Dual Friction

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10-08-2001, 07:41 PM	#2
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	'66, the hose going from the spacer to the valve cover is for the PCV valve (positive crankcase ventilation valve). This needs to stay intact for emission purposes and won't cost you any power. You do need to change the PCV valve occasionally (25,000 miles?). Make sure the hose and connections are good as you don't want any vacuum leaks. The wetness under the front of the carb is from (1.) the accelerator pump leaking or (2.) the float bowl leaking. Either of these accounts for you smelling gas. It evaporates easily from the hot intake manifold and filters into passenger compartment where you smell it. If your car has a vacuum line to the distributor, then you need to keep it. Make sure the line and connections are in good shape. Again, you don't want any vacuum leaks. Some performance distributors have only centrifugal advance (my Mallory Unilite is one of these). That costs some mileage as you don't get early vacuum advance when you put your foot in it at lower RPM. If I replace that distributor, I'll definitely get vacuum advance. Hope this helps with the questions a little. Rev ------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi. [This message has been edited by Rev (edited 10-08-2001).] [This message has been edited by Rev (edited 10-08-2001).]