Because of the recent posts on PCV's, today I went to my shop to look at my '63 (Sept '62) 300 HP engine and couldn't find a PCV. The shop manual suggests that there were two systems used in '63, one using the valve and the other one venting fresh air from the air cleaner via the oil fill tube thru to the rear by the distributor and plumbed to the back of the carb. My question is: was this system only used on low HP engines and the PCV used only SHP engines. I've owned this car since '76 and am very slow on resto so I haven,t gotten to the drivetrain and never studied anything on the engine. THX for any help Frank
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Re: PCV-valves
Look at your AIM. All '63 engines used the same "closed" PCV system architecture. On all carbureted engines clean fresh air is routed from the air cleaner to the oil fill tube - circulates through the crankcase and exits at the back of the block near the distributor. From there it is routed to the valve, which is connected to the back of the carb. by an elbow and an adapter bushing on AFBs.
The '64-'65 system is completely different and doesn't have a valve.
Duke -
Re: PCV-valves
Frank, Since you've owned this car so long untouched I bet you have the original rare PCV tube to block sleeve and grommet. The sleeve and grommet are pressed into the top of your engine block behind the distributor. Typcical restored cars, etc. you see today have the later style fat rubber grommet? If you have this then 1/2 the battle is done. If you look in the repro catalogs and the parts manual the vacuum tube that connects to the PCV via a rubber hose-the vaccum tube is the same for ALL 63's I believe. Readily availiable repro. Someone else asked the same question as you a few days ago but there are so many posts I can see why you missed it. Lot of echos also. Like this one. Big thing for originality is to have your engine builder use kid gloves when pulling the sleeve and grommet out of the block as you want to use it over like we did. When I judge 63-64 mechanical one of my "things" is this part. Seldom do the pretty show cars have it. It has a hole in the center that the vacuum line plugs into. I believe it was used to around May but have to confirm this detail with the guru's. Finding the correct rubber hose is really tough. Hose has a diamond pattern on it. 6 or 7 diamonds to the inch. Tough house to find. JohnComment
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Re: PCV-valves
To aid recognition. the top of the early OE steel sleeve/grommet is flush with the block surface. The top of the later rubber grommet, which became the service part for all '63s is above the block surface and the top OD is larger since it overhangs the block hole.
The service replacement is easy to spot.
DukeComment
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Re: PCV-valves
Hi Duke and others, Anyone know just how late the sleeve and grommet were used in 63??? Thanks, JohnComment
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Re: PCV-valves
The AIM sheet change record shows that the sheet was changed on 5-3-63 to reflect the new part number.
It is very likely that dispostion of the old parts was "use until supply is exhausted", so the actual useage of the new part was probably very late in the production run and there could be some cars in sequence that use one or the other depending on how the new parts were pulled from plant inventory after they arrived. It's also possible that the new part was never used on '63 depending on how many old parts the plant had.
Small parts like this probably arrived at the plant in large lots - say at least 500 which which would support about two weeks of production, but my bet is that the lots were larger - maybe at least a thousand to support a month of production.
"Just in time inventory management" was not practiced back then. When I was a Pontiac production engineer at the Van Nuys plant supporting the '69 Firebird pilot build, I was amazed at the quality of parts laying around. One I remember in particular was a wire mesh metal "basket" about 4 feet by 5 feet and at least three feet deep FULL of K-66 amplifiers. There must have been hundreds of them in that basket, and that was a fairly high value part that didn't have high utilization since K-66 was a relatively low volume option.
Duke
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Re: PCV-valves
Thx All for the responses. I think I understand more about this now. My block bushing is the flush fit one. Regards FrankComment
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