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Old 04-25-2018, 12:09 PM   #1
1968 baby blue C10
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Intake manifold oil fill neck cap

Can anyone tell me what the correct 710 cap is for the oil fill neck on a 4 barrel manifold and where I can get one? It had a push in cap when I got it and it slightly leaks occasionally.
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68 C10 long-fleet, Long and low is the way to go. factory: 307 sbc, SM465 4-speed, 12 bolt 4.11 rear end. 75,000 original miles.
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Old 04-25-2018, 01:02 PM   #2
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Re: Intake manifold oil fill neck cap

That looks like a common oil fill cap you can get at your local auto parts store.
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Old 04-25-2018, 01:09 PM   #3
1968 baby blue C10
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Re: Intake manifold oil fill neck cap

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Originally Posted by demian5 View Post
That looks like a common oil fill cap you can get at your local auto parts store.
Really? It looks to me like it needs some type of twist in cap almost like a radiator cap. This is the factory caps that LMC has but none look right to me. Dang it picture went sideways .
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68 C10 long-fleet, Long and low is the way to go. factory: 307 sbc, SM465 4-speed, 12 bolt 4.11 rear end. 75,000 original miles.
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Old 04-25-2018, 02:30 PM   #4
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Re: Intake manifold oil fill neck cap

I agree that you need a twist on cap. Probably the LMC # 30-4122. I'm no expert, but I don't recall that type of filler used in the intake after the 283s and 327s and implementation of PCV valves. Prior to PCVs that type of filler (but without the restriction and notches at the top) that I recall seeing used a push on ventilated cap similar to the LMC 43-4350-C. What year and displacement is the engine? Is the intake original to the engine? Does thit have a PCV valve?

EDIT: My original 350 with a hole in the valve cover uses a twist on cap. The diameter of the hole measures 1.20 inches (slightly greater than 1.50" at the notches). If that's what yours measures, I'd again say you should get one like the LMC 30-4122.

Last edited by FirstOwner69; 04-25-2018 at 02:50 PM.
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Old 04-25-2018, 04:23 PM   #5
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Re: Intake manifold oil fill neck cap

Its just a stant 10066 cap man...

https://www.oreillyauto.com/detail/b.../10066/5699121
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Old 04-25-2018, 05:13 PM   #6
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Re: Intake manifold oil fill neck cap

I think the 307s still had that type. If so the valve covers wouldn't have the push in breathers like yours. IIRC
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Old 04-25-2018, 07:30 PM   #7
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Re: Intake manifold oil fill neck cap

My 68,327 has the LMC cap #1.
Mike.
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Old 04-25-2018, 07:36 PM   #8
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Re: Intake manifold oil fill neck cap

Quote:
Originally Posted by FirstOwner69 View Post
I agree that you need a twist on cap. Probably the LMC # 30-4122. I'm no expert, but I don't recall that type of filler used in the intake after the 283s and 327s and implementation of PCV valves. Prior to PCVs that type of filler (but without the restriction and notches at the top) that I recall seeing used a push on ventilated cap similar to the LMC 43-4350-C. What year and displacement is the engine? Is the intake original to the engine? Does thit have a PCV valve?

EDIT: My original 350 with a hole in the valve cover uses a twist on cap. The diameter of the hole measures 1.20 inches (slightly greater than 1.50" at the notches). If that's what yours measures, I'd again say you should get one like the LMC 30-4122.
Sorry I should've listed the specs, it is the original 68 307 but one of the previous owners added a 4 barrel, I don't know what from, I always assumed a later model 327. and it does have a PCV setup. So do you think the valve covers aren't original and the PCV and breather setup was added to it?
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68 C10 long-fleet, Long and low is the way to go. factory: 307 sbc, SM465 4-speed, 12 bolt 4.11 rear end. 75,000 original miles.
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Millennial and can drive stick.
"Too many people have opinions on things they know nothing about. And the more ignorant they are, the more opinions they have." -Thomas Hildern

Last edited by 1968 baby blue C10; 04-25-2018 at 10:04 PM.
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Old 04-25-2018, 07:39 PM   #9
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Re: Intake manifold oil fill neck cap

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Originally Posted by 100%Chevy View Post
My 68,327 has the LMC cap #1.
Mike.
I kind of figured that was the one it is but for some strange reason they have it listed as 250 and 292, weird.
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68 C10 long-fleet, Long and low is the way to go. factory: 307 sbc, SM465 4-speed, 12 bolt 4.11 rear end. 75,000 original miles.
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"Too many people have opinions on things they know nothing about. And the more ignorant they are, the more opinions they have." -Thomas Hildern
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Old 04-25-2018, 07:41 PM   #10
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Re: Intake manifold oil fill neck cap

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Originally Posted by demian5 View Post
Cool, now that I know I don't have to order one I can just get one locally and try it, thanks.
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"Too many people have opinions on things they know nothing about. And the more ignorant they are, the more opinions they have." -Thomas Hildern
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Old 04-25-2018, 08:03 PM   #11
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Re: Intake manifold oil fill neck cap

Quote:
Originally Posted by VetteVet View Post
I think the 307s still had that type. If so the valve covers wouldn't have the push in breathers like yours. IIRC
I checked in my 68 user manual and it lists a PCV and crank case breather. Maybe the oil fill neck is from an older vehicle? Of course it being painted and the manifold not being painted makes me think itís the original oil fill neck.
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68 C10 long-fleet, Long and low is the way to go. factory: 307 sbc, SM465 4-speed, 12 bolt 4.11 rear end. 75,000 original miles.
Build:Ole Blue
Millennial and can drive stick.
"Too many people have opinions on things they know nothing about. And the more ignorant they are, the more opinions they have." -Thomas Hildern
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Old 04-26-2018, 08:06 AM   #12
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Re: Intake manifold oil fill neck cap

if that filler was original it would need to be one with a sealed twist-in cap like yours in order for the pcv system to be functional
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Old 04-26-2018, 09:37 AM   #13
1968 baby blue C10
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Re: Intake manifold oil fill neck cap

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Originally Posted by volksworld View Post
if that filler was original it would need to be one with a sealed twist-in cap like yours in order for the pcv system to be functional
Wow I never even thought about that. Iím going to have to get a new cap soon.
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68 C10 long-fleet, Long and low is the way to go. factory: 307 sbc, SM465 4-speed, 12 bolt 4.11 rear end. 75,000 original miles.
Build:Ole Blue
Millennial and can drive stick.
"Too many people have opinions on things they know nothing about. And the more ignorant they are, the more opinions they have." -Thomas Hildern
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Old 04-26-2018, 10:27 AM   #14
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Re: Intake manifold oil fill neck cap

Maybe you should remove the tube and plug the hole with a core plug.

https://www.google.com/search?tbm=is...HCcMCC0AUtcvM:
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Old 04-26-2018, 10:34 AM   #15
1968 baby blue C10
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Re: Intake manifold oil fill neck cap

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Originally Posted by geezer#99 View Post
Maybe you should remove the tube and plug the hole with a core plug.

https://www.google.com/search?tbm=is...HCcMCC0AUtcvM:
I would hate to do that, I really like the oil fill neck.
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68 C10 long-fleet, Long and low is the way to go. factory: 307 sbc, SM465 4-speed, 12 bolt 4.11 rear end. 75,000 original miles.
Build:Ole Blue
Millennial and can drive stick.
"Too many people have opinions on things they know nothing about. And the more ignorant they are, the more opinions they have." -Thomas Hildern
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Old 04-26-2018, 10:50 AM   #16
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Re: Intake manifold oil fill neck cap

Napa #703-1692 Oil Filler Cap
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Old 04-26-2018, 06:50 PM   #17
1968 baby blue C10
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Re: Intake manifold oil fill neck cap

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Originally Posted by 3757chevy View Post
Napa #703-1692 Oil Filler Cap
Thanks for the part number.
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68 C10 long-fleet, Long and low is the way to go. factory: 307 sbc, SM465 4-speed, 12 bolt 4.11 rear end. 75,000 original miles.
Build:Ole Blue
Millennial and can drive stick.
"Too many people have opinions on things they know nothing about. And the more ignorant they are, the more opinions they have." -Thomas Hildern
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