C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

406 SBC Problems to Resolve This Winter

Thread Tools
 
Search this Thread
 
Old Dec 7, 2021 | 08:57 PM
  #41  
Shovels and Vettes's Avatar
Shovels and Vettes
Thread Starter
Le Mans Master
 
Joined: May 2008
Posts: 9,063
Likes: 2,736
2022 C3 of the Year Finalist - Modified
Default

Originally Posted by OldCarBum
This is what I do when installing a new pan and dipstick or trying to determine the proper oil level on an old one,
If you have a new 6 quart pan or one with all the oil drained and a new filter installed.
Pour in 6 quarts of oil and 1 quart for a standard size filter, so 7 quarts,
Start the engine, let it warm up and drive it around the block,
Turn off the engine and check the level of the oil on the dipstick,
File a small line into the dipstick where the oil just showed as full.
That's it.
If you are running twin oil filters and remote oil coolers, this will change and you need to compensate for the additional oil in the system.
An 8 quart pan would take 8 quarts and 1 quart for the filter and so on...
I basically did as you detailed with this six quart pan, and filter. With this fancy Lokar dipstick I got, I was lucky to be able to see 1/16 of oil on the end of the dipstick.....BEFORE the leaking began.
Old Dec 7, 2021 | 09:12 PM
  #42  
calwldlife's Avatar
calwldlife
Team Owner
15 Year Member
Loved
Community Favorite
Top Answer: 1
 
Joined: Jan 2007
Posts: 53,648
Likes: 878
From: Southern Cal Ca
St. Jude Donor '22
Default

I though dipstick was to keep from getting an oil level that the crank can hit and aerate causing foam instead of oil.

If that is the case, a stock oil stick will show the level keeping it below the crank because it is mounted at the pan line which shows the relationship of oil height in the pan?

Old Dec 7, 2021 | 10:26 PM
  #43  
ebbnflow's Avatar
ebbnflow
Pro
 
Joined: Jul 2021
Posts: 719
Likes: 156
Default

Originally Posted by Flyboy1958
Well.....my builder is 2000 miles away, and its now on me to get this all right. I did not order a Blem block and was not notified otherwise. It was ordered through Summit. As for oil pans, I understand the technology, but I also live in my real world. If someone is going to tell me that I can FEEL the difference in acceleration from an oil pan with all the "race" features versus a stock pan,.....well, I have doubts.

Old Dec 7, 2021 | 11:57 PM
  #44  
gkull's Avatar
gkull
Team Owner
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Default

Originally Posted by Flyboy1958
So, another "stupid question".....is the oil level measured from the bottom of the engine mounting surface down to the top of the oil level.....and therefore it does not matter how many quarts an oil pan is, the oil needs added till the level rises up to the mark on the dipstick.......if it is a six quart pan, six quarts will put the level at the same place on the diptstick as a five quart pan with five quarts. Is that correct?
Yes, My Morroso 7 quart is 8 1/2 inches deep and I use the stock dip stick. Yes the full high mark is just below the stock L-82 main cap studs windage tray.
Old Dec 8, 2021 | 08:11 AM
  #45  
Jebbysan's Avatar
Jebbysan
Dr. Detroit
Supporting Member
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
Default

Originally Posted by gkull
Yes, My Moroso 7 quart is 8 1/2 inches deep and I use the stock dip stick. Yes the full high mark is just below the stock L-82 main cap studs windage tray.
This is the case on a lot of pans but not all......the correct oil level for any pan is just below the sump baffle.....so oil doesn't slosh around. A couple of quick measurements with the engine on a stand will let you know what is going on. But it should always be checked......it is good practice.

Windages trays do work BTW...and I have built many engines with them.....but they are 100% unnecessary on the street and reap zero benefits unless you spend a lot of time above 5000rpm.......
The down side to windage trays is the lack of oil they spray upwards to the lifters.......if using a windage tray for flat tappet application.....one should run the lifters with he EDM hole at the bottom to help lube the heel of the lifter.......I will not build a customer an engine with a windage tray for the street....and I know that L-82's and LT--1's came with but I wonder why.....especially the L-82....
I like the Moroso oil pump rear baffle for hard launching cars with a stockish style pan......cheap effective oil control there.

Jebby
Old Dec 8, 2021 | 11:34 AM
  #46  
OldCarBum's Avatar
OldCarBum
Race Director
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2016
Posts: 14,428
Likes: 8,231
From: Napa Valley California
Default

When you purchased this engine did you get an itemized parts list showing part numbers and a build sheet itemizing all labor and machining?
I'm just wondering if you actually have a 6 quart pan or maybe a mismatched or wrong dipstick for your setup?
I purchased one crate engine from a major supplier.
After all the problems I had, I said never again.
I used a local, well respected builder this time around.
Old Dec 8, 2021 | 12:28 PM
  #47  
diehrd's Avatar
diehrd
Safety Car
 
Joined: Jan 2009
Posts: 4,000
Likes: 299
From: New York
Default

The bubbling of the coolant only when he turns on the heat is pretty indicative of a heater core issue. The rear main seal is also unlikely. And after 3 pan gaskets I would bet money the pan is fine and the timing cover is his issue, As far as the rear main I bet its the china wall. Also even a valve cover leak can drip from the bell housing. Because the motor is nose up and oil will run to the lowest point and drip.

Another issue no one ever asks , how is the crank case ventilated. That in and of itself on a built motor. Will cause leaks from blow by. Something the best of the best motors have. And why performance motors use vac pumps to clear the crankcase. I have seen small amounts of oil pushed out of a dip stick tube only under heavy loads b/c the crank case is Un-ventilated. And make it look like a pan leak. I have also seen Chevy's only after a hard pull leak out of the china wall. While daily driving results in zero leaks.

Its not always easy to find an issue. But its even harder to find what caused it to begin with. And a well done repair should cover both topics.



Old Dec 11, 2021 | 12:18 PM
  #48  
Shovels and Vettes's Avatar
Shovels and Vettes
Thread Starter
Le Mans Master
 
Joined: May 2008
Posts: 9,063
Likes: 2,736
2022 C3 of the Year Finalist - Modified
Default

I borrowed borescope from work and looked up in the bell housing, and the oil galley plugs on the back of the engine have wet oil on the bottom. Could be sprayed up from the leaking rear seal I suppose. I could not be more pissed off. I am pulling the damn engine. Between leaking seals on a brand new engine and unknown coolant leak,....I should have built the engine myself. While it is possible to change the rear main seal from the bottom of the car,....now that these galley plugs look wet, and oil is everywhere, for me, its just better to get the engine out of the car, check out all the plugs, have it upside down where I can get good access to the seal, and the oil pan. I have a lot of cleaning to do.

I will borescope the intake manifold, check the head bolt torque....and if necessary pull it apart. I have this winter to get it fixed and back in the car.....and the last thing I want is all these problems next spring.

Last edited by Shovels and Vettes; Dec 11, 2021 at 12:56 PM.
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

5 Best & 5 Most Overrated Corvette Track Packages of All Time!

 Joe Kucinski
story-1

Every 2027 Corvette Engine Explained

 Joe Kucinski
story-2

Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

 Verdad Gallardo
story-3

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-4

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-5

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-6

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-7

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-8

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-9

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
Old Dec 11, 2021 | 12:49 PM
  #49  
Shovels and Vettes's Avatar
Shovels and Vettes
Thread Starter
Le Mans Master
 
Joined: May 2008
Posts: 9,063
Likes: 2,736
2022 C3 of the Year Finalist - Modified
Default

Originally Posted by diehrd
The bubbling of the coolant only when he turns on the heat is pretty indicative of a heater core issue. The rear main seal is also unlikely. And after 3 pan gaskets I would bet money the pan is fine and the timing cover is his issue, As far as the rear main I bet its the china wall. Also even a valve cover leak can drip from the bell housing. Because the motor is nose up and oil will run to the lowest point and drip.

Another issue no one ever asks , how is the crank case ventilated. That in and of itself on a built motor. Will cause leaks from blow by. Something the best of the best motors have. And why performance motors use vac pumps to clear the crankcase. I have seen small amounts of oil pushed out of a dip stick tube only under heavy loads b/c the crank case is Un-ventilated. And make it look like a pan leak. I have also seen Chevy's only after a hard pull leak out of the china wall. While daily driving results in zero leaks.

Its not always easy to find an issue. But its even harder to find what caused it to begin with. And a well done repair should cover both topics.
Responses - you say bubbling is a "heater core issue"......what exactly does that mean? Are you saying the heater core is leaking? I have no coolant on the floor. Or are you saying its allowing air into the system? How? What exactly do you mean?

As for the oil leak...yes the front seal is leaking. But its not the cause of all the leaks INSIDE the bell housing. There is oil all over the INSIDE of the bell housing. And its not the china wall, or anything else on top of the engine....I have checked it many many times.

As for ventilation, I have the Wagner adjustable PCV valve, adjusted as instructed, on the left valve cover, and on the right, I have a K&N air breather. There is no oil being pushed out of the dipstick.

So, now what?

Pulling the damn engine and starting over.

Last edited by Shovels and Vettes; Dec 12, 2021 at 06:04 AM.
Old Dec 11, 2021 | 10:53 PM
  #50  
OldCarBum's Avatar
OldCarBum
Race Director
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2016
Posts: 14,428
Likes: 8,231
From: Napa Valley California
Default

Stay positive, it could be worse and at least you have the winter to get it done.
Keep us updated.
Old Dec 12, 2021 | 10:18 AM
  #51  
diehrd's Avatar
diehrd
Safety Car
 
Joined: Jan 2009
Posts: 4,000
Likes: 299
From: New York
Default

Originally Posted by Flyboy1958
Responses - you say bubbling is a "heater core issue"......what exactly does that mean? Are you saying the heater core is leaking? I have no coolant on the floor. Or are you saying its allowing air into the system? How? What exactly do you mean?

As for the oil leak...yes the front seal is leaking. But its not the cause of all the leaks INSIDE the bell housing. There is oil all over the INSIDE of the bell housing. And its not the china wall, or anything else on top of the engine....I have checked it many many times.


As for ventilation, I have the Wagner adjustable PCV valve, adjusted as instructed, on the left valve cover, and on the right, I have a K&N air breather. There is no oil being pushed out of the dipstick.
.
So, now what?

Pulling the damn engine and starting over.

Leaking into the interior is only one possible consequence of a bad heater core it can also get plugged up with ****.. And Inside the bell housing is were all oil ends up from leaks on the back of the engine. It in and of itself is not a indicator of the source.

Vent the crank case with something more then a PCV valve no matter who its made by or how fancy it may be.

Old Dec 12, 2021 | 10:50 AM
  #52  
C3TPI's Avatar
C3TPI
Instructor
 
Joined: Nov 2019
Posts: 221
Likes: 71
From: Kalispell, MT
Default

And after you are all done with that, go to the county courthouse and file a small claims action against the builder. I don't care if Keith Black built the engine, he did a shitty job for sure!

Last edited by C3TPI; Dec 12, 2021 at 03:27 PM.
Old Dec 12, 2021 | 12:15 PM
  #53  
Shovels and Vettes's Avatar
Shovels and Vettes
Thread Starter
Le Mans Master
 
Joined: May 2008
Posts: 9,063
Likes: 2,736
2022 C3 of the Year Finalist - Modified
Default Better Words

Originally Posted by diehrd
Leaking into the interior is only one possible consequence of a bad heater core it can also get plugged up with ****.. And Inside the bell housing is were all oil ends up from leaks on the back of the engine. It in and of itself is not a indicator of the source.

Vent the crank case with something more then a PCV valve no matter who its made by or how fancy it may be.
You keep commenting, but its not making sense to me or is it giving me any information on what is the cause. I have a snapping/cracking/popping noise, noticeable at idle, ONLY when the heater is turned on. The noise occurs at exactly the same time as the heater hose going into the intake manifold pulses....you can see it, and feel it. I also have a situation where I am constantly loosing coolant. I have pressure tested the system with Stant pressure tester, both engine hot and cold.....and it holds test pressure for 30 minutes. The instructions in the tester says this is enough time to show a tight system. I have replaced the thermostat and the noise stopped for awhile,....but its back again.

What I do know is this. There is NO smell of coolant inside the car. There is no coolant in the carpet. There is no coolant draining out of the hole in bottom of heater core housing. The heater is very effective and can roast me out of the car. SO.....I don't think it is plugged, and I don't think it is leaking. So.....now what? There is also no other visible evidence of coolant leaks anywhere externally. The car was NOT blowing white smoke, and it was running great, with absolutely no symptoms of any coolant leaks internally.

I will say I pulled all the plugs out today....and they have a brown tint to them. All the same....and the headers have the same brown tint inside.

As for the oil leak, I find it hard to believe oil coming from the front of the engine, or from the china wall, or the heads, or anywhere else would migrate the whole way to the top INSIDE of the bell housing, as well as leaking from the seam between the bell housing and the Borg T10 transmission. There is wet oil on the pipe plugs in the back of the motor, above the cam freeze plug. But there is now oil everywhere....a huge f***** mess.

I have TWO problems here.....and I am looking for answers. The engine is almost out of the car. Once out I will be looking everywhere for causes of these two issue

As for ventilation.....I have no idea why I would need a vacuum pump. I have an open K&N air filter breather on the right side, and a Wagner PCV valve, which is more effective than a stock PCV, on the left side. Why is this not enough to ventilate a basic Chevy V8 that has 8000 miles on it. Why? And what type of ventilation system is available that would be better? Answers. Another point is that these 8000 miles of driving have been at normal street speeds, I have only taken the engine to 6000 RPM once, most of the time I don't exceed 4000 RPM....and that is rare. With this engine, there is so much torque, I have no need to push it any harder....I am going 70 mph without pushing it. Why does this engine need a vaccuum pump?

Last edited by Shovels and Vettes; Dec 12, 2021 at 12:22 PM.
Old Dec 12, 2021 | 01:01 PM
  #54  
OldCarBum's Avatar
OldCarBum
Race Director
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2016
Posts: 14,428
Likes: 8,231
From: Napa Valley California
Default

If you want to take out any doubt of it being the heater core or anything related to the thermostat, pull the thermostat and bypass the heater core and see if the pulsing stops.
Do one at a time so you can pinpoint which may be the issue.
Another thing you could check is to see if the lower radiator hose is collapsing under pressure.
Old Dec 13, 2021 | 12:48 AM
  #55  
68post's Avatar
68post
Burning Brakes
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Nov 2012
Posts: 788
Likes: 100
From: Indianapolis IN
Default

Your crankcase venting is fine, especially if you're not dripping oil out of the K&N. If that happens after any high rpm runs you'd need more vent capacity or a catch can. I prefer just 2 vents and no pcv.
Old Dec 13, 2021 | 09:19 AM
  #56  
ebbnflow's Avatar
ebbnflow
Pro
 
Joined: Jul 2021
Posts: 719
Likes: 156
Default

perhaps hand the assembled motor over to a local, genuine pro for the autopsy ?
Old Dec 13, 2021 | 09:31 AM
  #57  
Shovels and Vettes's Avatar
Shovels and Vettes
Thread Starter
Le Mans Master
 
Joined: May 2008
Posts: 9,063
Likes: 2,736
2022 C3 of the Year Finalist - Modified
Default

Originally Posted by ebbnflow
perhaps hand the assembled motor over to a local, genuine pro for the autopsy ?
Yeah.....I have had it with "pro's". I trust myself. I have respect for those that earned respect....otherwise, being a pro means very little to me. It means you got paid for the job.

Get notified of new replies

To 406 SBC Problems to Resolve This Winter

Old Dec 14, 2021 | 09:27 AM
  #58  
Shovels and Vettes's Avatar
Shovels and Vettes
Thread Starter
Le Mans Master
 
Joined: May 2008
Posts: 9,063
Likes: 2,736
2022 C3 of the Year Finalist - Modified
Default

Now this…..oil drain plug



Old Dec 14, 2021 | 12:46 PM
  #59  
calwldlife's Avatar
calwldlife
Team Owner
15 Year Member
Loved
Community Favorite
Top Answer: 1
 
Joined: Jan 2007
Posts: 53,648
Likes: 878
From: Southern Cal Ca
St. Jude Donor '22
Default

damn.
hard to see what those coils of metal are,
regardless, they should not be there.
Old Dec 14, 2021 | 01:22 PM
  #60  
OldCarBum's Avatar
OldCarBum
Race Director
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2016
Posts: 14,428
Likes: 8,231
From: Napa Valley California
Default

Could be old shavings from cleaning or tapping threads.
Someone didn't do a thorough enough job of cleaning things up before assembly.
You should take the time to open the oil filter and see what you find inside.



All times are GMT -4. The time now is 07:32 PM.

story-0
5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Slideshow: The 5 best and 5 most overrated Corvette track packages ever.

By Joe Kucinski | 2026-06-09 12:46:45


VIEW MORE
story-1
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

By Joe Kucinski | 2026-06-09 12:16:31


VIEW MORE
story-2
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.

By Verdad Gallardo | 2026-06-08 19:53:43


VIEW MORE
story-3
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-4
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-5
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-6
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-7
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-8
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-9
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE