Using Lucas 20/50 break in oil all the time

[OVERKILL]

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OK, excellent. So, standard sized bearings, a street-friendly Comp camshaft and a Melling M55 oil pump w/60lb spring (standard volume/standard pressure).

No, that doesn't sound like that engine is built for 20w-50, lol.

436HP with no accessories, to the crank at 4,900RPM, am I reading that right? definitely not a high winder.

 

[brihvac]

 

[brihvac]

OK, excellent. So, standard sized bearings, a street-friendly Comp camshaft and a Melling M55 oil pump w/60lb spring (standard volume/standard pressure).

No, that doesn't sound like that engine is built for 20w-50, lol.

436HP with no accessories, to the crank at 4,900RPM, am I reading that right? definitely not a high winder.

No. Its in a 65 Impala convertible. I wanted a nice driver. Yes on the dyno. There are many more pages I just took a picture of the cover sheet. It also has aluminum heads with the specs you saw. So I will switch to the 10/40. He is a old drag racer so maybe that is why he told me 20/50

 

[brihvac]

Well you kind of need the cam specs to select the correct torque convertor, unless the builder picked one for you.

EDIT: rear end gear ratio would be nice to know also, but i'm guessing at a 3.31:1 or 3.55:1.

Hughs 2000 stall with shift kit and the rear is a factory 12 bolt 3:08 posi

 

[spasm3]

Hughs 2000 stall with shift kit and the rear is a factory 12 bolt 3:08 posi

A bit tall for that cam.

 

[FCD]

Even if that engine is built with loose clearances i wouldn't run Lucas 20w50, i'd run Mobil 1 15W-50, which has 1300ppm of ZDDP which is enough for any flat tappet cam no matter how wild.

 

[ka9mnx]

Can you locate and publish the crankshaft (rods and mains) oil clearances?
Not a wild build by any means.

 

[spasm3]

Don't need break-in oil all the time. I'd look at High Performance Lubricants Bad Ass Racing oil 5w40. Or their CK-4 heavy duty 10w40.

I'm running their passenger car plus in my truck.

@High Performance Lubricants

Bad Ass Racing Oil

Bad Ass Racing Oil is an oil designed for those looking for higher performance and better protection. It is formulated with the best base oils and the highest quality additives to maximize performance and meet the high demands in racing applications. The additive technology in Bad Ass Racing Oil...

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CK-4 Premium Heavy Duty Engine Oil

High Performance Lubricants Premium Heavy Duty CK-4 engine oil is one of 3 multi-synthetic engine oils we offer. Compared to our Heavy Duty CK-4 this group of formulations take advantage of an advanced VI improver that has a superior shear stability index. It is designed for equipment or...

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[brihvac]

Can you locate and publish the crankshaft (rods and mains) oil clearances?
Not a wild build by any means.

I didn’t want a wild build. It’s a 65 Impala boat. I just wanted a cruiser

 

[addyguy]

Sounds like a nice cruiser for sure.
Any quality HDEO 15W-40 off the shelf will be all you ever need.

 

[Thomas Campbell]

Valvoline VR1

 

[Rygrego]

Was not cheap and he builds race motors for local racers. It is not a roller. I am alos questioning if I should be using 20/50

20W-50 is fine except in harsh winters.

 

[BAJA_05]

How about posting some pics of your cruiser....