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Author Topic: 390 still using oil  (Read 11241 times)

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390owner

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Re: 390 still using oil
« Reply #30 on: April 16, 2020, 06:19:15 PM »
Here is the vacuum reading. It is not steady for sureIMG_2849 by Daniel Crymes, on Flickr
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dcm0123

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Re: 390 still using oil
« Reply #31 on: April 16, 2020, 07:25:40 PM »
Do you have a working PCV system?
Mine was doing the same after the rebuild until I installed one.
Pulling a vacuum under the pistons helps keep the oil from going past the rings
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390owner

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Re: 390 still using oil
« Reply #32 on: April 16, 2020, 07:28:57 PM »
Yes
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66FAIRLANE

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Re: 390 still using oil
« Reply #33 on: April 16, 2020, 07:38:02 PM »
What inlet manifold is it? I am just screwing together my 390 and dummied up the heads & manifold (RPM) last night to check the gaps. I noticed something holding the manifold up slightly. The port flanges are very very deep & hitting the head/block intersection area. This will be enough so as not to get full compression on the gaskets. I will be removing quite a bit of material (probably around .100 or so) from the bottom of this flange area to let the manifold sit down properly.
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machoneman

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Re: 390 still using oil
« Reply #34 on: April 16, 2020, 07:59:26 PM »
Quote from: 390owner on April 16, 2020, 06:19:15 PM
Here is the vacuum reading. It is not steady for sureIMG_2849 by Daniel Crymes, on Flickr

Not good. Yeah, the low reading and bouncing needle means something is amiss. As noted, perhaps the intake was hanging up on the OEM Ford aligment dowel pin on the china wall, the head gasket tabs that some gaskets have to hold up the intake gaskets in the correct position or (generally non-OEM intakes) the casting on the valley side is preventing the intake gaskets from fully sealing. That's why a careful inspection of the intake gaskets sometimes reveals that at the perimeter (thin: valley side) the gaskets aren't equally compressed, hence a valley gasket leak and smoke.
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Bob Maag

My427stang

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Re: 390 still using oil
« Reply #35 on: April 16, 2020, 08:06:46 PM »
Which intake, which heads, which gasket?     :)

I can't promise an answer, but there are a lot of potential mismatches of those three parts the many of us would know right off the bat
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Ross
Bullock's Power Service, LLC
- 70 Fastback Mustang, 489 cid FE, Victor, SEFI, Erson SFT cam, TKO-600 5 speed, 4.11 9 inch.
- 71 F100 shortbed 4x4, 461 cid FE, headers, Victor Pro-flo EFI, Comp Custom HFT cam, 3.50 9 inch

390owner

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Re: 390 still using oil
« Reply #36 on: April 16, 2020, 08:19:36 PM »
Stock heads stock four barrel intake. Good gaskets but I will have to look for the brand the machine shop used I think it was fel pro gaskets but I will check
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My427stang

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Re: 390 still using oil
« Reply #37 on: April 16, 2020, 08:52:24 PM »
Casting numbers on each would help more but ask if he used the all blue Felpro or the Printoseal
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Ross
Bullock's Power Service, LLC
- 70 Fastback Mustang, 489 cid FE, Victor, SEFI, Erson SFT cam, TKO-600 5 speed, 4.11 9 inch.
- 71 F100 shortbed 4x4, 461 cid FE, headers, Victor Pro-flo EFI, Comp Custom HFT cam, 3.50 9 inch

mkopmani

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Re: 390 still using oil
« Reply #38 on: April 19, 2020, 06:24:32 AM »
Have someone follow you again to watch exhaust while you get on it hard and let off the throttle entirely. If it smoked while on the throttle hard, it's rings, if it smokes off the throttle or heavy downshift deceleration, it's the guides. Just because they're new valve guides doesn't mean that they are clearances right. Sounds dumb, but check that valve seals are installed properly or that they weren't forgotten entirely.
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fryedaddy

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Re: 390 still using oil
« Reply #39 on: April 19, 2020, 03:37:08 PM »
Quote from: fryedaddy on March 09, 2020, 06:38:16 PM
intake gasket,i sealed mine up good this last time and it no longer uses a quart of oil every few days like it did.
when i switched from a pi intake to a rpm,my engine done the same thing yours is doing.i took the intake off twice and both times it smoked and used oil when i put it back on,the third time i put it on i used a very healthy amount of sealer on it.it no longer smokes or uses oil.
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1966 comet caliente 428 4 speed owned since 1983                                                 1973 f250 ranger xlt 360 4 speed papaw bought new

390owner

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Re: 390 still using oil
« Reply #40 on: April 19, 2020, 04:54:50 PM »
Here are a couple of plugs. My stupid phone would not focus but you can see they are black. If I lean my carb any more than it is now the engine surges.https://flic.kr/p/https://flic.kr/p/https://flic.kr/p/2iSagjC
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390owner

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Re: 390 still using oil
« Reply #41 on: April 19, 2020, 04:58:34 PM »
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390owner

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Re: 390 still using oil
« Reply #42 on: April 19, 2020, 05:00:02 PM »
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390owner

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Re: 390 still using oil
« Reply #43 on: April 19, 2020, 05:01:22 PM »
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390owner

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Re: 390 still using oil
« Reply #44 on: April 19, 2020, 05:02:08 PM »
The plugs have 2500 miles on them
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