364 Buick question (Old guys, step up.....)
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364 Buick question (Old guys, step up.....)
I'm working on a set of 364 Buick heads (circa 1960). I have disassembled a few sets of these old nail-heads, but I have never seen any valve stem seals and there seems to be no room for them. Yet AERA says they have umbrella seals and the NAPA picture of the head set contents shows valve seals. I really don't think there is room for them, and I don't think all that much oil reaches the valves, especially if the rocker shaft assembly is worn, so I am not inclined to machine the guides for seals.
What do you old fellers with experience on these heads think? (I'm thinking Jack Vines......)
Thanks,
tom
What do you old fellers with experience on these heads think? (I'm thinking Jack Vines......)
Thanks,
tom
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Re: 364 Buick question (Old guys, step up.....)
Tom, try T/A Performance. They still have parts for the old nailheads.
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Re: 364 Buick question (Old guys, step up.....)
having seen them recently they were more of a deflector similar to an older LA Chrysler.
But not like the old cadillac umbrella seal for depth.
But as mentioned T/A performance should have them in stock or diamentions
But not like the old cadillac umbrella seal for depth.
But as mentioned T/A performance should have them in stock or diamentions
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Re: 364 Buick question (Old guys, step up.....)
They must be very small to not interfere with the inner spring. I wonder if they disintegrate like the old Ford umbrellas did. There was absolutely no sign of a seal or any pieces of such in any of the heads I've disassembled.
tom
tom
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We used to speak to tell things , now they tell things to speak.
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Re: 364 Buick question (Old guys, step up.....)
Buick didn't put valve guide seals on the Nailhead until 1966....and then they used them only on the intakes.
jack vines
jack vines
Jack Vines
Studebaker-Packard V8 Limited
Obsolete Engineering
Studebaker-Packard V8 Limited
Obsolete Engineering
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Re: 364 Buick question (Old guys, step up.....)
Thanks, Jack, THAT clears things up big time. I thought I was going crazy. Judging by how bad the guides were in these heads when I disassembled them, I don't think I want to restrict the oil to them. I relined them with phoshpor bronze liners and sized them at .0025" exhaust, .0015"-.002 intake, toward the tight side for both.PackardV8 wrote:Buick didn't put valve guide seals on the Nailhead until 1966....and then they used them only on the intakes.
jack vines
tom
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We used to speak to tell things , now they tell things to speak.
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Re: 364 Buick question (Old guys, step up.....)
IIRC they had a rubber flat seal that sat on top of the spring retainer. Was an old
trick to use them on SBC's that were long in the tooth and the customer wanted a
$5 rebuild for worn out guides. Don't remember what year nail heads...
trick to use them on SBC's that were long in the tooth and the customer wanted a
$5 rebuild for worn out guides. Don't remember what year nail heads...
Re: 364 Buick question (Old guys, step up.....)
IIRC, the lifter centerline is offset to the cam lobe centerline so the cam lobe pushes only on one side of the lifter, the force differential rotating the lifter.
Jack Vines
Studebaker-Packard V8 Limited
Obsolete Engineering
Studebaker-Packard V8 Limited
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Re: 364 Buick question (Old guys, step up.....)
So, I understand the SBC cam is not exactly parallel to the crank center line ? If so, is this common?
Motorcycle land speed racing... wearing animal hides and clinging to vibrating oily machines propelled by fire
Re: 364 Buick question (Old guys, step up.....)
We have a technical terminology problem. AFAIK, the SBC cam tunnel centerline is parallel to the crank center line.
Jack Vines
Studebaker-Packard V8 Limited
Obsolete Engineering
Studebaker-Packard V8 Limited
Obsolete Engineering
Re: 364 Buick question (Old guys, step up.....)
Ok.....Thr old Chevy inline 235-261 and GMC 302 I messed with had the lifters offset to the cam lobes..The cam grinders told me the lobes are also ground to spin the lifters...
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Re: 364 Buick question (Old guys, step up.....)
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Re: 364 Buick question (Old guys, step up.....)
KJ, thanks for the link which explains the design. My IIRC was IFIRIC (in fact,i recalled incorrectly.)
Jack Vines
Studebaker-Packard V8 Limited
Obsolete Engineering
Studebaker-Packard V8 Limited
Obsolete Engineering
Re: 364 Buick question (Old guys, step up.....)
Interesting read....... and seeing them talk about things like pressure recovery in those stock heads...... back in 1953.Kevin Johnson wrote: ↑Tue May 19, 2020 8:23 pmPage 490: Column 2, lines 3-8.
http://wildaboutcarsonline.com/members/ ... _Buick.pdf
I also liked that part about the cam design and the lifter pump up at 5300 for the intake valves, and 5500 for the exhaust........ with the springs set up at 62/144.
I wonder if they continued to use chilled iron lifters and steel camshafts for the entire production run of that engine family.
Somewhat handy with a die grinder.