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Old 07-28-2022, 06:57 PM   #1
Bridgeman57
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1969 sbc 302 oil

Picked up a 61’ longbed last week and motor looks pretty much stock. Odometer says 77k but more like 177k. Motor runs good. Frame has been swapped as well the engine with a 1969 302. Still has the good ol trusty quadrajet. Little build up of milky sludge on top of valve covers. Previous owner says he ran SHELL T TRIPLE PROTECTION 15w-40. Kind of smells like a little gas on the dip stick, might be my nose. I’m thinking a carb might have a little leak. Previous owner also didn’t drive it as much. Valve covers also need to be replaced. Please let me know your thoughts.
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Old 07-28-2022, 07:22 PM   #2
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Re: 1969 sbc 302 oil

302... kinda rare. You sure?

A lot of cats ran Shell Rotella diesel oil for a while as it had more zinc in it. Not the case anymore. I would run an oil intended for a flat tappet engine with zinc additives already in it.

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My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread.

The Rebuild of Creeping Death after the wreck

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I would never rebuild a 305.
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I love using vacuum gauges as part of the carb tuning process. I hook the gauge to the inside of my garbage can and leave it there.
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Remember Murphys 2nd law of mechanical relationships... "OPPOSING COMPONENTS ATTEMPTING TO OCCUPY THE SAME SPACE, AT THE SAME TIME, GENERALLY END UP OCCUPYING ADJOINING SPACE AT THE BOTTOM OF THE OIL PAN"
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Old 07-28-2022, 08:11 PM   #3
Bridgeman57
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Re: 1969 sbc 302 oil

Numbers in back are 3970010
Behind alternator are V0599800
Cannot find anymore
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Old 07-28-2022, 08:40 PM   #4
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Re: 1969 sbc 302 oil

More likely a newer 350.
Pop a valve cover off and check the head casting number.

One triangle on the front of the head might indicate this:
I Large triangle over rectangle 882 Large chamber (76cc), hardened exhaust valve
M One triangle 882 Alternative marking for 882; see I, above
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Old 07-28-2022, 08:50 PM   #5
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Re: 1969 sbc 302 oil

Diesel oil still works fine. I run it in a motor that sees 8k RPM and the cam is atleast 5 years old.

An original 302 chevy would have a 780cfm holley carb.
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Old 07-28-2022, 10:28 PM   #6
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Re: 1969 sbc 302 oil

Gas in the oil smell could be a leaking fuel pump.
Also might be a buildup of blow by and not being driven long enough for the oil to get hot enough to drive out the blow by products.

Not definitive but 60s motors had the alt on the driver's side, at least on AC vehicles. And a different set of support brackets. At least my 68 did.
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Old 07-28-2022, 11:19 PM   #7
truckster
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Re: 1969 sbc 302 oil

If blue is the original engine color it's likely a 77 or newer.
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Old 07-29-2022, 05:15 PM   #8
AussieinNC
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Re: 1969 sbc 302 oil

The bolts holding the rocker covers on...are they closer together on the intake side or spaced the same on both intake and exhaust sides....

3970010 block should be a 350, not a 302....

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Old 07-29-2022, 05:25 PM   #9
geezer#99
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Re: 1969 sbc 302 oil

010 block can be a 302, 327 or 350.


https://www.mortec.com/castnum.htm

The dimensions of the code pad is also a clue to what year.
Info here in suffix codes section.


https://www.crankshaftcoalition.com/..._Chevy_engines

Last edited by geezer#99; 07-29-2022 at 06:40 PM.
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Old 07-31-2022, 01:41 PM   #10
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Re: 1969 sbc 302 oil

Quote:
Originally Posted by geezer#99 View Post
010 block can be a 302, 327 or 350.
Because all three have the same 4 inch bore and main journal diameter. Each has a different stroke.
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Old 08-01-2022, 11:22 AM   #11
GASoline71
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Re: 1969 sbc 302 oil

Quote:
Originally Posted by RustyPile View Post
Because all three have the same 4 inch bore and main journal diameter. Each has a different stroke.
And the chance of it being a 302 from 1969 are pretty slim. I agree with the above that the blue paint is also a giveaway that it is a later engine from the late 70's.

Gary
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My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread.

The Rebuild of Creeping Death after the wreck

Quote:
Originally Posted by LONGHAIR View Post
I would never rebuild a 305.
Quote:
Originally Posted by prostreetC-10 View Post
I love using vacuum gauges as part of the carb tuning process. I hook the gauge to the inside of my garbage can and leave it there.
Quote:
Originally Posted by Marv D View Post
Remember Murphys 2nd law of mechanical relationships... "OPPOSING COMPONENTS ATTEMPTING TO OCCUPY THE SAME SPACE, AT THE SAME TIME, GENERALLY END UP OCCUPYING ADJOINING SPACE AT THE BOTTOM OF THE OIL PAN"
Quote:
Originally Posted by cableguy0 View Post
Its cheaper to listen to advice given when you ask for help than it is to ignore everyone and wait for carnage.
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