Where does the that oil thing between the 3rd and 4th set of rocker arms connect?

The pipe that carries oil to the rocker assembly goes through the block and connects into the oil system at that point.

To an oil line.The line connects to the right (passenger) side of the center oil connector.The line runs down behind the side push rod cover.It passes thru the water jacket between #3 and #4 cylinder and comes out low on the left side of the block .There it connects to the valve body thats bolted to the block.At the point where it enters the water jacket and also where it exits a completely water tight fitting is used.The upper part of the line can be seen on the right side of the engine---------STOP-ALL THEINFO. IS INCORRECT-----thinking you were working on a 216 engine.just remembered that you are working with a 1952 235 engine.

On that engine the line connects behind the side cover way to the rear and bottom of the push rod area.Just behind the last lifter.The rear cam bearing supplies the oil.From there the line runs up to the center connector - going behind the push rods.(it does not pass thru the block.You should find the hole next to the back lifter bore.

Just went out and checked and your right again.looks like a male fitting with a femail on the other end fits into the block, then a flaired tube with a fitting.I've never taken apart a 235 only 216s just wasn't sure where the line came from.

Went to the auto parts store and all they had was steel tubing. Was this copper?

YES

I just received my e-mail order oil line and it came with an 1/2inch fitting to go into the block at the rear main. A 3/8inch bolt with fine thread fits into this hole not a 1/2 inch pipe thread is this common? Do they still make a fitting with this tread?

The fitting that goes into the block at either end of the oil line will have 1/8" pipe thread.That other end of the fitting is for the line.The line end uses a nut and sleve to connect to the fitting - so the other end of the fitting will have the threads to match the nut (and sleve)...this fitting would be called a connector.The line is 22" long and of 3/16" diameter.Steel line can be used as the small diameter line is esy to bend.I would buy a 3/16" brake line and cut the flared ends off.

An alternative would be to use the flared line and use an inverted flare fitting - the type us for the gas line to fuel pump, etc...That fitting would have 1/8" male pipe thread on one end and 3/16" female on the other to match the fitting on the flared end of the line.

This line was never sold by Chevrolet - they expected it to be made up from a piece of line and correct fittings......sounds as if you "found" a line for a 216 engine which has much larger fittings as it goes thru the block.

Thanks again Chevgene. got the oil line hooked up with a 1/8 male pipe thread into 3/16 compression fitting connector. Now my next big question is How do I identify the vibration damper? The book has different casting numbers for 216 and 235 dampers but I don't see any numbers on them. I have 2 sizes, 1 small with a wide pulley and a larger one with a narrow pulley.

First the 235 and 216 used two differently tuned balancers.Actually either one will fit either engine.There is a wide belt and narrow belt version of either one.The 216 version will have casting number 838863 - and is 6 1/32" in diameter.The 235 balancer is 7 1/4" in diameter ( the outter weight area) and no number is shown.The narrow pulley version was used from 1953 and up.OK to use but narrow pully water pump and generator pulley will also need to be used.