The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

**'68OrangeSunshine** · 05-25-2018, 08:31 PM

The right break-in sequence for a Chevy L6 runs something like this:
[Use a lot of Black Moly cam grease on internal parts]
Fill crankcase w/ 6 qts [292 specs] 30 weight Non-Detergent, non-synthetic oil.
Pre-spin oil pump drive with electric drill motor/distributor shaft until nominal oil pressure comes up. Install distributor.
Start engine, run 20 - 30 minutes at variable speeds from 1500 - 3000 RPM.
Run truck 'gently' for 500 miles, staying off freeways, No high RPM runs.
After 500 miles change oil and replace with regular detergent oil. [I like Valvoline VR1 Racing SAE 30.]
Now no restrictions on speed.

As for your low compression on last 3 cylinders -- you torqued the head down as per Engine Overhaul Manual specs? Installed rings so gaps on successive layers are 120* or 180* opposed?

05-25-2018, 08:31 PM	#8
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,064	Re: I did what I was scared of today The right break-in sequence for a Chevy L6 runs something like this: [Use a lot of Black Moly cam grease on internal parts] Fill crankcase w/ 6 qts [292 specs] 30 weight Non-Detergent, non-synthetic oil. Pre-spin oil pump drive with electric drill motor/distributor shaft until nominal oil pressure comes up. Install distributor. Start engine, run 20 - 30 minutes at variable speeds from 1500 - 3000 RPM. Run truck 'gently' for 500 miles, staying off freeways, No high RPM runs. After 500 miles change oil and replace with regular detergent oil. [I like Valvoline VR1 Racing SAE 30.] Now no restrictions on speed. As for your low compression on last 3 cylinders -- you torqued the head down as per Engine Overhaul Manual specs? Installed rings so gaps on successive layers are 120* or 180* opposed? __________________ Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 05-25-2018 at 08:46 PM.