[Terracan]

Hi,
My engine is recently rebuilded and after startup all went fine. I ran her for about 20 minutes at 2000 rpm and no problems occured.
Today I was starting her up again and all went fine for about 5 minutes then a very od sound comes from left bank of my engine. It is not a knocking or something like that. It sounds like when a fan belt is not tight enough but I dont have any belts mounted!
I did a check with ignition of and cranked her a few rounds and no sound, then I removed valve covers to se that oil was coming up when I was priming her with the right type of primer and a power drill. I started her again whitout covers and it was not much oil that reached the rockers but a little. The oil pressure is about 70.
(The preassure gauges range is 0-100)
I use pennzoil 20-50 and she doesnt smoke any and sounds great.

Some facts about the engine
I have recently changed pistonrings, mainbearings and three pushrods casue they were bent a little and so on in my BB 468"!
The engine has High perf heads and a holly 700dp, headers and electric waterpump. The alternator is not installed yet!

I dont know what to do and I am afraid of starting her up.
I have to say that the sound is following the rpm!
Please I know that you guys are helpful very good at engines. By the way the car is a camaro 67 pro-touring and I love her
regards jimmy, sweden

[camcojb]

Did you figure out (and fix!) what caused the pushrods to bend?

Jody

[Terracan]

Hi
These three were the only that wasnt crome moly.
I have got stiffer springs mounted, maybe this was the cause.
jimmy

[camcojb]

The stock steel pushrods still shouldn't bend unless there was an interference problem of some sort; coil spring bind, retainer to guide, etc.

One thing I have had happen on big blocks is to not have enough oil up top and it burns up the rockers. Squeeks like a squeeling fan belt. You ought to take a look at them and see if there's any that are dry, turning blue, etc. Also re-check the things above to figure out why the pushrods bent.

Jody

[oger]

I agree with Jody. A galled rocker arm and ball make the most godawfull screech you will ever hear.

[Terracan]

Hi,
This could be it! I will check this tomorrow!
Regards jimmy

[Terracan]

Hi again!
Today I removed my rockers and pushrods and all look fine except the exhaust rocker cylinder 1. It was total dry but whitout any od colour or damage. I decided that it was fine to lube it and try to prime the engine to se if oil reaches the rocker and it does. Then I ran her for about 20 minutes at diferent rpm´s and it was fine.
No sound at all

I had a friend to remove the cover and look a few times and it was ok.

This rocker cyl 1 and exhaust rocker on cyl 2 dont get so much oil compare to the others but ther is oil!!! Is this a common problem on big block?
I use a melling Hv pump and the oil pressure gauge when the engine is hot never goes under 50psi.
Is this to much?
I have to say that my rebuild of this engine woke her up again and that is fun
Thank you again!
regards jimmy

[phel69]

If you just rebuilt this engine then why are you running 20w-50 ? You should be running 10w-30 or 10w-40 unless you have a bearing clearance issue. It might even get you a little more oil up to the top.

[Terracan]

Hi,
I have always ran her on 20-50 and I have ever looked on the other oils cause I had a major bearing issue before. Now my crank journals are .010 with new bearings so you are totaly right. I will change oil very soon and then I will test 10-40.
Thank you for the tip
jimmy