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07-27-2022, 11:16 AM
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#1 |
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Registered User
Join Date: Apr 2022
Location: Moorpark, CA
Posts: 774
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72 250 6 cyl cam?
Is the stock cam flat tappet hydraulic or full roller hydraulic??
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07-27-2022, 11:40 AM
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#2 |
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State of Confusion!
  
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,216
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Re: 72 250 6 cyl cam?
Flat tappet. I honestly don't know of any roller cam setups. Well at least I didn't when I built mine 3 years ago.
__________________
Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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07-27-2022, 05:41 PM
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#3 | |
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Moderator
 
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,204
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Re: 72 250 6 cyl cam?
Quote:
https://www.12bolt.com/store/p196/Bi...292_Chevy.html Most "stock" flat cams are perfect for street use....just remember the Zinc additive unless you are using Valvoline VR oil.... 
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox 
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07-27-2022, 12:23 PM
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#4 |
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Registered User
Join Date: Apr 2022
Location: Moorpark, CA
Posts: 774
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Re: 72 250 6 cyl cam?
yeah I assumed since IIRC 88?? was when GM went to full roller
Given the low zinc content in todays conventional oil, I may add some Rislone zinc additive. Not sure what was used by PO's. Motor has about 116k mi on it but runs quiet as a mouse with that said I used conventional 10-30 in my flat tapped hydraulic 327 motor without issues |
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07-27-2022, 03:36 PM
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#5 |
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State of Confusion!
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,216
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Re: 72 250 6 cyl cam?
For a new cam I would definitely run high zinc oil (Valvoline Racing) plus additive ( I used GM breakin additive or Lucas oil brand) . That is what I do on all mine for breakin. It might be an overkill, but It stinks to loose a cam on break in for a few dollars extra on lubricants. Then I normally end up using the Rotella T4 diesel oil after the initial break in period
__________________
Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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07-27-2022, 03:49 PM
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#6 |
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Registered User
Join Date: Apr 2022
Location: Moorpark, CA
Posts: 774
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Re: 72 250 6 cyl cam?
I use break in oil even on full roller cam motors (Valvoline VR1) on first start and 500 mi
While I have not had issues on motors with just flat tappet hydraulic cams using todays conventional 10-30 oils (read motors that have a good deal of milage on them)....I am going to add zinc additive to conventional oil in the 72 250. Its the original motor, I assume untouched, but todays oils just don't have the zinc content they did pre CAT motors |
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