I posted about the 75$ 283 awhile back and got that 283 installed in my cj5 and running great. If I wanted to use the original firepower valve covers Then I would run the pcv valve off the pcv port from the Holley to the road draft tube at the back of the block right? I have a grommet that allows the pcv valve to fit snug in the road draft tube port. Just wanted to make sure that’s how it was done before I changed the covers.
Pressure relief reduces oil seepage and leaks, but Positive crankcase ventilation requires fresh air flowing in, and blow by etc flowing out. Even the road draft system let fresh air in at the other end of the engine, in a separate chamber inside the engine so fresh air would sweep through the engine. Get it wrong, and even a real short oil change schedule will have a hard time keeping the nether regions from sludging up. Some pretty modern engines have gotten it very wrong.
I have the pcv valve ran to the road draft tube at a 90 degree angle after reading a couple threads on here.. now the more serious question. I have a performer intake and valve covers with no holes for a breather.. is there anyway to get around not having the breather without drilling a hole in the valve cover?
You could put an oil fill tube with a breather in the front of the waterneck, like on a factory 283 manifold?
I bored my Performer intake for fill tube/breather cap. To answer your question, your going to need make up air coming in. You can't run it closed.
No breather tube on the intake, and none on the valve covers. How did you plan to put oil in the engine? KK
Get a PCV for a 1965 Impalla with a 283, yes there were PCV's in 65. Go to your local parts store and look for STANDARD MOTOR PRODUCTS V100. I will tread into the base of your carb and you just run a hose to the rear elbow behind the distributor. Works great, you just have to make sure that you have a vented oil fill cap on you fill tube at the front of the intake manifold, since you are using the script valve covers with no holes.
you can pull your intake off and drill the hole for the oil fill tube, I have done that several times on performer intakes. I have one on my 39 right now like that.
Thanks everyone! I have a performer on the 283 now so I can use the Holley. Just gonna pull the intake back off and run an an adapter on the standard 283 intake so I can keep the Holley. Then having the oil fill with a vented cap I can run the pcv to the road draft tube at a 90 like I have it now and use the stock valve covers?
Evidently...you can. @jimmy six shared on another post the other day his Bonneville race engine that has a bely driven vacuum pump sucking out the crankcase with no air intake. Purposely trying to fire the pistons into a vacuum. Interesting and unsure about street application but evidently you can run it closed. Reminds me of a story about a couple yoots standing near a RR track, the elder said to the youngun, "don't stand that close to the rail, the train will suck you off". The younger replied "come on train!". That really wasn't on topic but it is Friday after golf and I have been imbibing.
Like apples to oranges. But if your street motor is so tired that that much cylinder pressure is bleeding by...
Running it closed will cause oil to get sucked up through it at a rather quick rate while street driving.
Nailhead Jason has said above how to install a PCV system on a SBC using the rear the fitting in the rear. The PCV valve screws into the rear of the carb and the hose goes to the fitting at the rear. The air needed to make this work all comes from the oil filler vented cap at he front of the intake. If you look those 62 327 rocker covers a lot of us like have no holes. The funny thing is a 62-64 Ford Y-Block is identical to the Chevrolet. As for running a vacuum pump in an engine, drag racing has been doing it for 20 years. You seal an engine as tight as you can and suck the vapors out thru a pump and hose it to a “catch can” with a breather. Known to those who use this even put the rear main seal in backwards so the vacuum will pull the seal surface against the crank. I say this to tell the vapors still escape because it’s thru the breather on the catch can. In the photo you can see the pump and hose coming to it from the rocker cover and the one from it to the catch can with the filter/breather on the top.
I spent the last three days swapping a 283 for a 283 had it running just cherry.. just wanted to use the valve covers with no vent. Spent all day swapping the intake so I could and now it’s a leaky terrible running pos I quit
From one of a couple dozen similar HAMB threads. Here: https://www.jalopyjournal.com/forum/threads/sbc-road-draft-baffle.969323/ Pretend this is a 283.
Back in my younger days working in the garage, this guy brings in his pickup truck in which he had just swapped in a new crate engine and it was making a really weird noise which no one in the shop had ever experienced before. The engine came with valve covers that had a rubber plug for the filler cap. The noise was a result of no air coming into the crankcase.
That's how the factory did it. On my car I just brazed a hosetail to the Cone. [This method still uses the "tomato can" oil separator inside the manifold valley The PCV valve on the carb was off a 66 Impala 283 2GC Doing this, I kept the staggered pattern "script" valve covers unmolested