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Old 07-19-2010, 11:45 AM
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SBC Oil leak Issue

I have just built a 350 SBC, i bought an assembled block from blueprint engines and then built the rest of the motor myself, the problem is I have had a small oil leak in the back of the motor somewhere and can't figure where it is coming from. There is oil all over the flex plate cover and all over my trans pan, also there is some oil on the starter.

Here is the specs on the motor
sbc 350 bored .040" over from blueprint engines
Comp cam Hydraulic Flat Tappet cam, roller rockers
Edelbrock intake, and aluminum heads
7 qt moroso pan with a one piece fel-pro gasket

Thanks,

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Old 07-19-2010, 12:01 PM
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A couple places I would check would be the back side of the intake at the distributor base since it's getting on you starter. Is it a lot of oil or just a little leak?
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Old 07-19-2010, 12:59 PM
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What kind of valve cover(center or perimeter bolt)/valve cover gaskets does it have? I had oil covering the same exact spots on mine with felpro blue rubber re-usable gaskets on a center bolt valve cover. They're supposed to be stretched around the base of the valve cover; this makes them highly likely to slip out of place because they're intentionaly undersized.
I superglued the gaskets with 4 drops, one in each corner of the valve cover; let it sit for a minute; bolted it down; and not a leak since.

Hope you find the leak.
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Old 07-19-2010, 02:05 PM
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My money's on the seal between the intake and block. Did you use a gasket or silicone?
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Old 07-19-2010, 02:43 PM
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oil leak

Also check the oil pressure sending unit on the back top of the block. I Hope it isnt the rear main seal. Did you feel up towards that area?
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Old 07-19-2010, 02:46 PM
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leak

here are just about all the places
1 rear of intake manifold
2 valve cover
3 there is a 1/8 pipe thread hole in very rear of block most often used for an oil pressure sender
4 oil could be coming from rear main seal (doubtful)
or rear cam freeze plug (also doubtful)
5 distributor gasket

if i were to take a guess i would say u slipped the rubber gasket on rear of intake
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Old 07-19-2010, 10:36 PM
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The weird thing is it doesnt leak the same amount all the time, some days it leave a 3" to 4" spot and then other days it will leaves a good 12" to 14" spot, It has been loosing about a qt a week and i drive it a good 150 miles a week. I have perimeter valve cover bolts and it doesnt seem to be leaking from there, the oil pressure sending unit is right above the oil filter so, ill have to look at that again, and the intake, i used blue rtv blue silicone on the front and back, it didnt seem like there was oil back there ill have to check that as well.

Thanks for all the input
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Old 07-20-2010, 02:30 PM
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Buy a leak detector kit with a UV light and dye. It will pinpoint the leak. Kit was <$20 when I bought mine about 5 years ago.
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Old 07-20-2010, 03:09 PM
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glen has a good idea on the dye,I use it on big diesels all the time and it works,remember there is still an oil passage with 1/8 pipe plug in rear top of block by distributor, I personally do not like to use R.T.V. I use welwood cotact cement for all my gaskets and works great for me, yes it comes off easy if you just glue some and not all of the gasket
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