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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: 2,267
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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: 10,693
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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: 2,267
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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: 2,267
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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: 805
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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: 22,066
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Re: Duntvo 30 30 cam
Quote:
__________________
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: 3,628
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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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10-04-2022, 03:35 PM
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#12 | |
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Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,066
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Re: Duntvo 30 30 cam
Quote:
__________________
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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10-10-2022, 05:59 PM
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#13 |
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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 put the Duntvo cam in my 327. Holy Shiet this thing has a lot of top end. High rpm’s pulls very hard and happy at 7 thousand to 8 thousand rpm shifts. This reminds me of my friends 1971 Hemi Cuda he built in the 90’s. I got to drive it once and that the only other car that scared the shiet out of me. Cuda had what seemed unlimited top end. The Vette has factory drum brakes and no power nothing. I have mixed emotions of excitement and pure terror. Maybe too much cam for me at my age. Pete |
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