A sbc question about breather tubes

54vicky · Oct 17, 2018

actually 2010 revisited in 2016 then now

BJR said: ↑

You guys do realize that this thread is from 2016, right?
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57tailgater · Oct 17, 2018

Still good info to see.

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Blues4U · Oct 17, 2018

xracer40 said: ↑

Actually the front oil fill, breather tube was never designed to be a breather, it was used for fresh air flow into the crankcase. Crankcase vapors would then exit through the road draft tube. In 62 they replaced the road draft tube with a pcv valve in California. In 63 all states used the pcv valve. There have been several different arrangements to getting fresh air in and vapors out. The ones where a pcv valve was plumbed to the oil fill tube, the tube used a sealed cap and fresh air was routed to rear of block where the road draft tube used to be, this resulted in air flow going from the rear of the block to the front of the engine. By 1969 all small blocks used the pcv valve in the valve cover with fresh air entering the opposite valve cover. This gave a side to side airflow through the crankcase.
At any rate which system you use front to rear, rear to front or side to side, you need this airflow to remove vapors, crankcase pressure and probably more important moisture from the crankcase.
Click to expand...

It took 6 years to get good information posted.....

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A sbc question about breather tubes

54vicky
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A sbc question about breather tubes

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54vicky
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from oakville ont. canada

57tailgater
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from Georgia

Blues4U
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from So Cal