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Old 11-03-2003, 04:53 AM
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DraftTube

Hey All,
Does anyone out there know what the purpose was of the drafttube on the early smallblocks? How will it affect the block if I want to modernize the block; do I just close that hole off.
Thanks for your answers in advance. Hawk51

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Old 11-03-2003, 05:00 AM
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The draft tube on early small block Chevies serves the same purpose as a PCV system on todays engines, except it put the crankcase fumes into the atmosphere without first burning them. Yes you can easily convert an early small block to PCV system, just block off the hole at the rear of the block and install a PVC valve and air cleaner vent/filter.

Vince
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Old 11-04-2003, 01:29 AM
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Mid-sixties small-blocks had an adapter in the hole where the draft tube went. I put on on an old 283 about 30 years ago. If I remember correctly, it connected to a hose that went to the back of the carb base where the PCV valve was attached. This allowed the use of the old solid valve covers.
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Old 11-04-2003, 05:38 AM
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Quote:
Originally posted by 302/Z28
The draft tube on early small block Chevies serves the same purpose as a PCV system on todays engines, except it put the crankcase fumes into the atmosphere without first burning them. Yes you can easily convert an early small block to PCV system, just block off the hole at the rear of the block and install a PVC valve and air cleaner vent/filter.


I did what these good people told me about, I put a rubber pcv grommet in the draft hole and ran a 3/4 tube and flex to the bottom of the air cleaner, and then silver soldiered a 3/8 bushing in the fill tube to screw in a PCV valve that goes to the vacuum on the carborator. I like the clean look of the solid valve covers on my 63 vette 327 motor. Ed ke6bnl

Vince
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