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> V8 Question: NARP but related, Hardcore Chevy guys should know
skline
post May 14 2004, 07:39 PM
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I got this 283 engine to put into my 914. It is a fresh motor and I built it with the parts suggested by Rod Simpson and others. I have seen many things on small blocks before but there is a hole in the block for something and I am not quite sure what it is. I was hoping maybe someone with old school Chevy knowledge would step up with an answer. I think it is for an Oil pressure sensor but its so large. That is why I am asking. Its circled in yellow as it doesnt show up well in the picutre. Anyone?


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PatW
post May 14 2004, 07:44 PM
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The little one is for an oil pressure gauge. The Big one is for a freeze plug.

I think.. (IMG:style_emoticons/default/ph34r.gif)
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Levi
post May 14 2004, 07:45 PM
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THe Big hole is the PCV and the small hole is for the oil sending unit
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Levi
post May 14 2004, 07:48 PM
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QUOTE(PatW @ May 14 2004, 05:44 PM)
The little one is for an oil pressure gauge. The Big one is for a freeze plug.

I think.. (IMG:style_emoticons/default/ph34r.gif)

Well the big hole can be filled with a freeze plug But the 283 used it for the PCV system.....
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skline
post May 14 2004, 07:53 PM
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The reason I asked is because I looked in a old book and saw a huge oil pressure sender that looked like it was installed in that hole but I couldnt tell. In any case, I need to fill that hole with something, prefferable something that wont leak.
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Levi
post May 14 2004, 08:06 PM
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QUOTE(skline @ May 14 2004, 05:53 PM)
The reason I asked is because I looked in a old book and saw a huge oil pressure sender that looked like it was installed in that hole but I couldnt tell. In any case, I need to fill that hole with something, prefferable something that wont leak.

If your talking about the big hole, I think a freeze plug is the prefered method. the little hole will be the Best place to put your oil pressure sending unit.
I have 2 283's and 25 years of building Small block Chevy engines, so let me know if you have any questions.


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Levi
post May 14 2004, 08:22 PM
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QUOTE(skline @ May 14 2004, 05:39 PM)
Ihoping maybe someone with old school Chevy knowledge would step up with an answer.

This is a clearer picture of the PCV hole Note inside the block is the inside part of the system. the next picture will show the piece that goes in the hole


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Levi
post May 14 2004, 08:23 PM
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this is the piece that bolts onto the big PCV hole


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Levi
post May 14 2004, 08:29 PM
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If I knew half as much about the 914 T4 engines as I do about Chevy engines I'd be on my 74 2.0L engine like fly's on shit... (IMG:style_emoticons/default/laugh.gif)
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skline
post May 14 2004, 08:36 PM
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Ok, well I will go and try to find a freeze plug to fit in there and the one on the front of the manifold. I will use the hole in the valve cover to put oil in.
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Levi
post May 14 2004, 08:52 PM
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If you use a later intake Manifold it won't have the front hole for the oil tube.
You will also need to put a PCV valve in your valve cover and hook it to the carb.
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skline
post May 14 2004, 08:58 PM
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Actually I found the type 4 to be quite simple in design and very easy to work on.
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J P Stein
post May 14 2004, 09:38 PM
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On a 283 that is the crankcase vent.....right out to the ground. If you plug it you'll need to vent both vlave covers......PVC valve....we doan need no stinkin' valbes (IMG:style_emoticons/default/biggrin.gif)
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Levi
post May 14 2004, 09:42 PM
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QUOTE(J P Stein @ May 14 2004, 07:38 PM)
On a 283 that is the crankcase vent.....right out to the ground. If you plug it you'll need to vent both vlave covers......PVC valve....we doan need no stinkin' valbes (IMG:style_emoticons/default/biggrin.gif)

The tube that comes from the crankcase vent aka PCV= positive crankcase ventalation, runs up to the bottom of the air cleaner....I just removed it from my original 64 283,

I would use 1 PCV in one VC and a breather filler cap in the other as seen on the picture of one of my 327 engines
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tesserra
post May 15 2004, 06:20 AM
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I have a 914 v8. Oil leaks are not uncommon, and I think that crankcase pressure is the reason. Vent the crankcase more than you normally would. You will be driving your car in the 3 to 5k rpm range regularly and the normal vent system is not good enough.
I have had 2 problems with 2 different motors. Front main seals leaked.
I now have a valve cover vent that is conected to the bottom of the air cleaner, throuh a filter first, in addition to the PCV. I am considering even more ventilation.
GET A REV LIMITER. You will need it. Especially if you autox or race. The RPMs build real fast.

Just some advice that would have saved me a cople of bucks.

George
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Levi
post May 15 2004, 10:38 AM
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QUOTE(tesserra @ May 15 2004, 04:20 AM)
I have a 914 v8. Oil leaks are not uncommon, and I think that crankcase pressure is the reason. Vent the crankcase more than you normally would. You will be driving your car in the 3 to 5k rpm range regularly and the normal vent system is not good enough.
I have had 2 problems with 2 different motors. Front main seals leaked.
I now have a valve cover vent that is conected to the bottom of the air cleaner, throuh a filter first, in addition to the PCV. I am considering even more ventilation.
GET A REV LIMITER. You will need it. Especially if you autox or race. The RPMs build real fast.

Just some advice that would have saved me a cople of bucks.

George

I can safely tell you that SBC oil leaks are always due to the assembly process. I can't imagine internal engine pressure causing seal or gasket failure, unless (maybe) the engine was seal up tight with no venting at all.
(IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/beerchug.gif)
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