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Old 10-01-2002, 11:07 PM
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Post smokey 348

Hey all! my first post so go easy on me (been watching for a while though). I have a 1960 El Camino with 348 and 3X2's and I have a problem with smoke coming out my oil fill tube, when the previous owner had the motor rebuilt he just had the road draft tube's hole plugged , anyhoo, I finally found a tube to replace it and it helped a little but the thing still spouts pretty badly. Its driving me nuts, my nice pretty motor being coated in an oily mess every time I take it out for a joy ride

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Old 10-02-2002, 05:56 AM
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How old is the motor? My guess would be too much crank case pressure which could be from a plugged breather or PCV valve.
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Old 10-02-2002, 06:18 AM
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I guess that you want to keep this as stock appearing as possible?
  • Is the road draft tube installation correct? Is there more to it than the actual road draft tube (example-early FORD had a mesh filter and baffle). Remember, the oil filler cap must be an open type that the engine will be able to draw fresh air through.
  • You might want to find an older CHEV dealer and ask if they have early parts books (or shop manual) that describes and/or illustrates a later '63 409 PCV System Illustration. If you have an extra rocker arm cover, you might want to holesaw it for a PCV grommet and valve (remember oil baffle under valve) and use a carb spacer for the vacuum inlet. It wouldn't be that difficult then to change it back over for show.

[ October 02, 2002: Message edited by: KULTULZ ]</p>
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Old 10-02-2002, 11:05 AM
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Henricks : the motor is the original 348 with hi/po cam, which makes it about 42.
It has no pcv system just the oil tube and road draft tube, (was made without pcv)...

Kultulz : honestly I'm about to put the 348 on an engine stand and put in a 502 or something of the sort till I'm ready to show it. the road draft tube is on correctly. I know the valve covers aren't original because they are chrome but I cant find any reasonable covers to take a saw to to give it some sort of pcv hole
what I'm really looking for are some later 409 valve covers with pcv system already rigged up
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Old 10-02-2002, 02:05 PM
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I'm not familiar with the "draft Tube", I'm guessing that it would be the same as a breather tube that comes off the valve cover and drops exits at the bottom of the vehicle, if this is it than did you change valve covers, if so did the valve cover have a baffle plate inside the cover?
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Old 10-02-2002, 08:11 PM
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on a 60 348 big block there was no pcv system all that there was were the road draft tube (breater tube) that comes off the rear of the engine, and the breather cap on the oil fill tube thats it. they put pcv on the 409's but as far as I know none of the 348 (at least from 1960) had pcv, also the valve covers weren't chrome, which is why I know my valve covers aren't stock as they are chrome (and the valve cover doesn't have a baffle in em )

[ October 02, 2002: Message edited by: Scuzzy ]</p>
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Old 10-03-2002, 04:59 PM
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If everything is correct with the draft tube, as it suppose to be from the factory, than I would guess you may have too much blow by allowing too much pressure into the crank case, rings.
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Old 10-03-2002, 05:46 PM
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You can install a pcv you need a chevy big block valve cover rubber pcv gromlet , it will fit in to the draft tube hole very nicely, install the pcv and run your hose to a vac sorce.
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Old 10-06-2002, 12:11 PM
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348 is a w motor so the normal big block covers won't work, and the road draft tube isn't connected to the valve covers but to the back of the block, but I think I'm getting some 62 409 valve covers that are already cut for pcv thanks for all the replies (took me a while to read them seeing as my baby boy was born 10/4, I'm the happiest I've ever been in my life
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Old 10-06-2002, 12:31 PM
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[ October 07, 2002: Message edited by: roys63 ]</p>
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Old 10-07-2002, 08:39 AM
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sorry i hadn't slept in like 3 days when I replied thanks thats a good idea
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