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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,030 Posts1,055,428 Members48,422 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Dec 2008 Posts: 1,922 'Bolter | | 'Bolter Joined: Dec 2008 Posts: 1,922 | There are only 3 data points needed to adjust the PCV design to a specific engine (in addition to the fittings).
1. ID of the high vacuum orifice
2. ID of the low vacuum orifice
3. spring tension which determines where 1 or 2 is correct.
The PCV from a similar-sized L6 in mild tune is a good substitute. | | |
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