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Head's spinning from what oil for 1970 chevy LT-1 #3365898 05/08/14 07:00 PM
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Traction Offline OP
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I have a new 1970 Chevy LT-1 solid lifter 350 that I've had since 1989. Currently has 200 miles on it. Ran Northland Superline 7 15w-40 diesel oil so far. Decided after reading endless posts here and on the C3 Corvette forum, that I need to change soon. So many opinions, it is so hard to make a choice. After reading the Mobil 1 info, that recommended 15w-50 for this engine with a SN rating and proper zinc levels. I decided that is heavier that I would like, so I am leaning toward their 0w-40 Euro spec oil that is SN rated with zinc. Good choice for a very rare low mi. engine? Also has to be a "over the counter oil" that I can get anywhere.

Last edited by Traction; 05/08/14 07:07 PM.

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Re: Head's spinning from what oil for 1970 chevy LT-1 [Re: Traction] #3365910 05/08/14 07:06 PM
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eljefino Offline
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How built is this? Eg what are the valve spring pressures like?

Re: Head's spinning from what oil for 1970 chevy LT-1 [Re: eljefino] #3365916 05/08/14 07:13 PM
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Traction Offline OP
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Originally Posted By: eljefino
How built is this? Eg what are the valve spring pressures like?

All stock, engine Chevy sold as a crate engine in the mid 70's. 11 to 1 forged, steel crank, turbo angle plug heads. Awesome engine, runs perfect. Would eventually like to go to a hydraulic roller cam, and E85 fuel, but it runs so good now, I hate to mess with it. It still had assembly lube on the valve train when I bought it for $1000.

Last edited by Traction; 05/08/14 07:15 PM.

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Re: Head's spinning from what oil for 1970 chevy LT-1 [Re: Traction] #3365927 05/08/14 07:22 PM
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Traction Offline OP
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The engine is actually in this 81 Camaro in Popular hotrodding. Muncie 4 speed, with a quick change rear, running a 4.47 to 1 gear.
http://www.popularhotrodding.com/features/1405_hometown_hot_rodding/


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Re: Head's spinning from what oil for 1970 chevy LT-1 [Re: Traction] #3365966 05/08/14 08:00 PM
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I'd run Chevron 20W-50 (for the solid lifters) with a bottle of Justice Brothers ZDDP treatment.

http://www.automedia2000.com/justicebrothers/JB0906.jpg

Re: Head's spinning from what oil for 1970 chevy LT-1 [Re: Traction] #3365973 05/08/14 08:06 PM
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fdcg27 Offline
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An API SN 10W-40 can have higher zinc levels than the same API spec would allow in a 5W-30.
QS Defy 10W-40 might be a good choice.


18 Accord Hybrid 20K HGMO 0W-20
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12 Accord LX 115K SSO 0W-20
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Re: Head's spinning from what oil for 1970 chevy LT-1 [Re: Traction] #3366017 05/08/14 08:44 PM
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il_signore97 Offline
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M1 0W40 would also be an excellent choice. It's a high quality oil that protects many very expensive engines straight from the factory. Should be great for yours.


il_signore97
'09 Mercedes-Benz C300 Sport Calcite White 6-spd M/T
Re: Head's spinning from what oil for 1970 chevy LT-1 [Re: il_signore97] #3366045 05/08/14 09:11 PM
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Lurgi Offline
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Joe Mondello, a well respected man in pushrod circles recommended a product called "Cam Shield." You can add it to whatever modern oil you choose in order to pump up the ZDDP to levels that your LT-1 was intended to run on. Mondello said he was having issues with flat tappet cams in the new engines he was building that STOPPED when he began using Cam Shield. And he didn't sell Cam Shield and apparently didn't receive anything from this small company for the recommendation. I have a bottle in the garage. I've used it in a few things but can't really give a meaningful critique. Search for Mondello and Cam Shield and I'm sure you'll find an article where he recommends it. Joe Mondello was one of the great American hot rod engine masters. A master of engines like your LT-1.

Re: Head's spinning from what oil for 1970 chevy LT-1 [Re: Merkava_4] #3366051 05/08/14 09:15 PM
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aquariuscsm Offline
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Originally Posted By: Merkava_4
I'd run Chevron 20W-50 (for the solid lifters) with a bottle of Justice Brothers ZDDP treatment.

http://www.automedia2000.com/justicebrothers/JB0906.jpg


^^This. A 20W50 of your fave brand.


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Quaker State Ultimate Durability 0W20

Re: Head's spinning from what oil for 1970 chevy LT-1 [Re: aquariuscsm] #3366191 05/09/14 12:06 AM
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Lurgi Offline
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My old man had one of those LT-1 crate engines. He put it in a '68 Camaro with a close ratio 4-speed and 4.10 12 bolt. That was 1977. I was a kid of 5 or 6. That car took my breath away. I refused to ride in it with him.

Re: Head's spinning from what oil for 1970 chevy LT-1 [Re: Traction] #3366279 05/09/14 07:10 AM
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20W50?!?!? That's asinine. All you're going to do is waste power. It's time to drop the old school thinking with today's lubricants.


The 350 in my drag car is based off of your same engine. I have run every oil under the sun in mine (solid lifter, shifting at 6000-6500 RPM), I settled on Mobil 1 5W30 years ago. The last time I changed camshafts for a new profile, the old cam had NO MEASURABLE wear. Break it in correctly with a QUALITY camshaft and you'll be fine.

The M1 5W30 worked great for years, but if I were to change my oil in my Malibu right now, I would use the best oil (IMO) in the XOM lineup, which is 0W40.


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Re: Head's spinning from what oil for 1970 chevy LT-1 [Re: Traction] #3366686 05/09/14 01:18 PM
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ProStreetCamaro Offline
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10W-30 Brad penn, VR1 or amsoil Z Rod. Absolutely no need for 20W-50 at all and with the correct oil no need for any additives either. Heck if you wanted cheaper oil Rotella T6 or standard rotella 15W-40 would work good also with no additives needed. 20W-50 does nothing but add drag to the rotating assembly. I have seen it cause an engine to sheer off a standard non hardened oil pump to distributor shaft.

Last edited by ProStreetCamaro; 05/09/14 01:20 PM.
Re: Head's spinning from what oil for 1970 chevy LT-1 [Re: Traction] #3366692 05/09/14 01:22 PM
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Valvoline VR1 10W30 is readily available and cost effective. I would try that and see how the engine likes it.


Re: Head's spinning from what oil for 1970 chevy LT-1 [Re: Traction] #3366744 05/09/14 02:00 PM
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A_Harman Offline
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Nix on the 20w50. I doubt that GM specified anything thicker than 30 for that engine when it was new.
Valvoline VR1 10w30 conventional.
Or buy a bottle of ZDDPlus and use it to supplement any good SN 5w30 synthetic.


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Re: Head's spinning from what oil for 1970 chevy LT-1 [Re: Traction] #3366904 05/09/14 04:50 PM
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bigt61 Offline
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You can't go wrong with the M1 15W-50 unless you're trying to start it in zero degree weather all the time. I don't think that old LT1 cam was so radical that 0W-40 or even 5W-30 wouldn't work in the M1 flavor. Defy is also a good choice.


92 Suburban 2500 7.4L 58k M1_0w40 5yr OCI
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