L31 break in - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1966chevyc20 · 02-27-2017, 10:44 PM

I have an L31 crate engine nearly installed and was unsure what oil to use. It has the roller cam so I wasn't sure if I need a high zinc oil or not. Any good oils I can find at a NAPA? Also, any specific oil filter? Break in process?
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**Captainfab** · 02-28-2017, 01:16 AM

Technically you do not need a high zinc oil with a roller cam. However some still prefer to run a breakin additive for the initial breakin. I prefer ti use WIX oil filters. The typical breaking procedure of 2000 rpm for 20-30 minutes is mainly to breakin a flat tappet cam. Since you have a roller cam, that should not be necessary. That's my .02. This post probably should be in the engine and drivetrain section where the engine experts will see it and reply.

**PGSigns** · 02-28-2017, 07:42 AM

When I did mine I just ran it about 20 minutes at 1500 rpm to let get up to temp and give the rings a chance to take a seat. I used a good quality 10-30 in it. Then I let it fully cool and went back and checked everything over and retightened the header bolts. Has 30000 miles on it now.
Jimmy

02-27-2017, 10:44 PM	#1
1966chevyc20 Registered User Join Date: Jan 2017 Location: North Dakota Posts: 37	L31 break in I have an L31 crate engine nearly installed and was unsure what oil to use. It has the roller cam so I wasn't sure if I need a high zinc oil or not. Any good oils I can find at a NAPA? Also, any specific oil filter? Break in process? Posted via Mobile Device

02-28-2017, 01:16 AM	#2
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: L31 break in Technically you do not need a high zinc oil with a roller cam. However some still prefer to run a breakin additive for the initial breakin. I prefer ti use WIX oil filters. The typical breaking procedure of 2000 rpm for 20-30 minutes is mainly to breakin a flat tappet cam. Since you have a roller cam, that should not be necessary. That's my .02. This post probably should be in the engine and drivetrain section where the engine experts will see it and reply. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

02-28-2017, 07:42 AM	#3
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: L31 break in When I did mine I just ran it about 20 minutes at 1500 rpm to let get up to temp and give the rings a chance to take a seat. I used a good quality 10-30 in it. Then I let it fully cool and went back and checked everything over and retightened the header bolts. Has 30000 miles on it now. Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic



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