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10-01-2022, 11:53 AM
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#1 |
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Registered User
 Join Date: Nov 2018
Location: Sarasota Florida
Posts: 282
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Duntvo 30 30 cam
Hello
I run across this 097 GM cam. I was wondering what these numbers mean on the back. Anybody know what they mean? Thanks Pete http://67-72chevytrucks.com/vboard/a...1&d=1664639518 |
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10-01-2022, 12:40 PM
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#2 |
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Registered User
Join Date: Feb 2012
Location: Beautiful BC, Canada, eh?!
Posts: 2,273
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Re: Duntvo 30 30 cam
Schneider has a grind they call a 295H, could be theirs. Likely the 295 is duration at the seat. H for Hydraulic. I'd suspect the 8 might be 108° lobe separation, but I'm talking out of my bum.
__________________
1961 Apache: "Grabber Orange" Shortboxed, pancake, step-notch, air-ride, turbo, LS 1977 Silverado: Shortboxed & dropped, potato-potato V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag Lotus Super 7 Replica: Scratch-built street-legal rollerskate |
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10-01-2022, 01:53 PM
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#3 |
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Registered User
Join Date: Nov 2018
Location: Sarasota Florida
Posts: 282
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Re: Duntvo 30 30 cam
Hello
I thought so too. But this is a GM camshaft 30 30 Duntvo number on the camshaft is GM # 3736098 I don’t think GM made a Duntvo camshaft for hydraulic lifters. I’m not 100% sure. If they did I never seen one. Pete |
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10-01-2022, 02:52 PM
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#4 |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,724
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Re: Duntvo 30 30 cam
Duntov 30-30 is nick-named that because that was the valve lash setting, iirc. That would solid lifters, there was never a hydraulic 30-30 cam.
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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10-02-2022, 12:10 PM
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#5 |
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Registered User
Join Date: Mar 2014
Location: Tacoma Wa
Posts: 146
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Re: Duntvo 30 30 cam
Yeah , that is not a Duntov 30/30 with a marking like that. Like others said, mechanical lifters and big valve lash. Rumpty Tumpty too but will idle a lot better than that 295 cam on a 108 separation 2 degrees advanced so set to 110 degree intake lobe centerline
. That Cam will idle at 1500rpm to stay running, all wrong for a truck and street vehicle.
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1953 3100 261cu in, sm420, 3.55 torque tube, omaha orange 1964 GMC 1000 series,custom, 305E, sm420 |
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10-02-2022, 04:06 PM
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#6 |
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Registered User
Join Date: Feb 2012
Location: Beautiful BC, Canada, eh?!
Posts: 2,273
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Re: Duntvo 30 30 cam
Well....
My '77 C10 350 has a flat tappet, 296° seat duration, 108°LSA camshaft that idles (choppy) in drive at 650rpm, at 8inHg, and pulls in 10mpg. It's been my daily driver for nine years, until gas here started pushing $10/gallon. It can be very driveable, if you know how to make it work..... Totally not a truck cam, though.
__________________
1961 Apache: "Grabber Orange" Shortboxed, pancake, step-notch, air-ride, turbo, LS 1977 Silverado: Shortboxed & dropped, potato-potato V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag Lotus Super 7 Replica: Scratch-built street-legal rollerskate |
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10-02-2022, 04:07 PM
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#7 |
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Registered User
Join Date: Feb 2012
Location: Beautiful BC, Canada, eh?!
Posts: 2,273
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Re: Duntvo 30 30 cam
Could be that cam WAS a Duntov, but got re-ground....
__________________
1961 Apache: "Grabber Orange" Shortboxed, pancake, step-notch, air-ride, turbo, LS 1977 Silverado: Shortboxed & dropped, potato-potato V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag Lotus Super 7 Replica: Scratch-built street-legal rollerskate |
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10-03-2022, 12:01 AM
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#8 |
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Registered User
Join Date: Nov 2018
Location: Sarasota Florida
Posts: 282
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Re: Duntvo 30 30 cam
Hello
Thanks for the response. This is going into the engine M building for my 1963 Corvette. I have a 327 bored over 60. I have 1963 Corvette X fuelie head with the big valves. Also have a Muncie M 21 4 spd. I don’t plan on driving everyday. Just being a little more than stock drive train. This is a nos cam. I was wondering if there had been work done on this cam. Sounds like there might have been. |
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10-04-2022, 10:03 AM
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#9 |
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Registered User
Join Date: Oct 2007
Location: Marietta, GA
Posts: 806
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Re: Duntvo 30 30 cam
I'd be cautious of using an unknown flat tappet cam in a new build. Maybe a better plan would be finding a new copy of the GM 30-30 cam.
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10-04-2022, 02:05 PM
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#10 | |
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Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,071
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Re: Duntvo 30 30 cam
Quote:
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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10-04-2022, 02:28 PM
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#11 |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,637
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Re: Duntvo 30 30 cam
Look into a roller cam these days. Unless you plan to run amsoil or zddp additive all the time.
I will never run a flat tappet again due to concerns. Plus after about 20 oil changes you can pay for a roller with the savings. |
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