350 cam options - ClassicOldsmobile.com


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Old November 13th, 2017, 09:19 AM   #1
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350 cam options

Hi guys I looked around and didn't see what I was looking for but I have a 1970 olds cutlas it's about 90 percent original it has the rocket 350 in it and originally had a 2 barrel carb which I swapped out. I'm looking at doing a rebuild and I'd like to squeeze a little more power out and thought a cam might do it. Do any of y'all know what size cam I could go with and not have to change anything else or damage the car?
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Old November 13th, 2017, 01:22 PM   #2
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If all you have changed is 2bbl for 4bbl and everything else is factory, I would say use an "RV" type camshaft with under 210º duration at .050" lift and around 260º advertised duration. That should provide a significant power increase without needing a higher stall converter, lower rear gears, etc.

http://www.jegs.com/i/Crane-Cams/271/803901/10002/-1

http://www.lunatipower.com/Product.aspx?id=1720&gid=287

http://www.lunatipower.com/Product.aspx?id=1703&gid=258

Last edited by Fun71; November 13th, 2017 at 01:30 PM.
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Old November 13th, 2017, 02:10 PM   #3
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[QUOTE=Fun71;1055684]If all you have changed is 2bbl for 4bbl and everything else is factory, I would say use an "RV" type camshaft with under 210º duration at .050" lift and around 260º advertised duration. That should provide a significant power increase without needing a higher stall converter, lower rear gears, etc.

http://www.jegs.com/i/Crane-Cams/271/803901/10002/-1

http://www.lunatipower.com/Product.aspx?id=1720&gid=287

http://www.lunatipower.com/Product.aspx?id=1703&gid=258[/QUOTE

i did this, and it got old really quick. With 2:73 gears and a slightly higher than stock stall it was kind of a dog out of the hole and only kinda set you back in the seat. It was an improvement over stock, but still wasn’t as ‘fun’ as we wanted it. So, the answer for us was a comp 280, comp stud mounted roller rockers, 3:73 gears, and 750 carb. Now she puts a smile on your face. If you do the work yourself, gears, a posi, and new axles was about $1200 with an install kit. The valve train is about $300, and the cam lifters and new springs about with a few other parts. With the gears you can go to a 2600-2800 stall and really get a nice launch out of the hole. Much more fun on the street, respectable at the track, and not too much out of pocket. Took us two years to make the changes but it was worth it

Last edited by Redrider; November 13th, 2017 at 02:28 PM.
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Old November 13th, 2017, 02:25 PM   #4
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If all you have changed is 2bbl for 4bbl and everything else is factory, I would say use an "RV" type camshaft with under 210º duration at .050" lift and around 260º advertised duration. That should provide a significant power increase without needing a higher stall converter, lower rear gears, etc.

http://www.jegs.com/i/Crane-Cams/271/803901/10002/-1

http://www.lunatipower.com/Product.aspx?id=1720&gid=287

http://www.lunatipower.com/Product.aspx?id=1703&gid=258
thank you for the help. It's greatly appreciated
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Old November 13th, 2017, 02:29 PM   #5
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[QUOTE=Redrider;1055694]
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Originally Posted by Fun71 View Post
If all you have changed is 2bbl for 4bbl and everything else is factory, I would say use an "RV" type camshaft with under 210º duration at .050" lift and around 260º advertised duration. That should provide a significant power increase without needing a higher stall converter, lower rear gears, etc.

http://www.jegs.com/i/Crane-Cams/271/803901/10002/-1

http://www.lunatipower.com/Product.aspx?id=1720&gid=287

http://www.lunatipower.com/Product.aspx?id=1703&gid=258[/QUOTE

i did this, and it got old really quick. With 2:73 it lower gears and a slightly higher than stock stall it was kind of a dog out of the hole and only kinda set you back in the seat. It was an improvement over stock, but still wasn’t as ‘fun’ as we wanted it. So, the answer for us was a comp 280, comp stud mounted roller rockers, 3:73 gears, and 750 carb. Now she puts a smile on your face. If you do the work yourself, gears, a posi, and new axles was about $1200 with an install kit. The valve train is about $300, and the cam lifters and new springs about with a few other parts. With the gears you can go to a 2600-2800 stall and really get a nice launch out of the hole. Much more fun on the street, respectable at the track, and not too much out of pocket. Took us two years to make the changes but it was worth it
after doing that work what did it endup running at the track? My plan is to just get it right and a little quicker than it is now. I've had it for years and after sinking money into it for a while I had to take a break for a while
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Old November 13th, 2017, 04:42 PM   #6
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I also want to ad a new cam to my 77 / 350/350
I have headers and 3.42 gears. In the spring i'll be adding the 200-r4 and may got to a 3.73 rear gear at that time. I really want to utilize the best of both world for torque and mid range power. Here in Boulder we like to take our cars into the windy steep mountain roads. Ideas on basic cam improvements for my car would be greatly appreciated.
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Old November 13th, 2017, 04:47 PM   #7
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Keep in mind that a 1970 350-2bbl engine has around 9:1 compression ratio and a 1977 350 engine has around 8.5:1 compression ratio (possibly less) so you can't put a cam with much duration or you will overcam the engine and totally kill low end power and overall driveability. This is why I recommended staying below 210º duration @ .050" lift.

Last edited by Fun71; November 13th, 2017 at 04:52 PM.
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Old November 13th, 2017, 05:19 PM   #8
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I am looking for the perfect RV cam for my set up.
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Old November 13th, 2017, 07:37 PM   #9
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Hopefully Cutlassefi will chime in. He did a 214/214 .472/.472 custom cam on a 110 lsa for my 9 to 1 350. For the 77 350 something like the 207/207 .461/.461 on a 112 lsa Lunatì high efficiency series cam might be better. I know Cutlassefi has done a couple cams for lower compression 350's. They are similar specs above except ground on a 106 or 108 lsa which helps bottom end torque.
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Old November 13th, 2017, 08:14 PM   #10
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[QUOTE=06turbosilverado;1055696]
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after doing that work what did it endup running at the track? My plan is to just get it right and a little quicker than it is now. I've had it for years and after sinking money into it for a while I had to take a break for a while
totally undwrstand. Mild cam might be a good choice then.

I forgot to add that she has headers and an edelbrock 7111. We still have some tweaks to make but at the last test and tune she was getting in the mid to low 13s if I could keep it from spinning. I might change the front shocks to a 90/10 and take off the front sway bar. We will see. If momma lets she spend the cash I’ll get a set of DOT slicks. That’s the best bang for the buck when it comes to traction...usually.

It’s all just fun and a great excuse to chew the fat with other gear heads at the track.
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Old November 13th, 2017, 08:47 PM   #11
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Fwiw I ran a 260h comp cams on a 350 with 9 to 1 compression. It was a 73 short blocks with 72 7A heads, performer intake, 600 cfm carb, 3.73 gears with a 2400 stall ran 13.8's

Current combo runs 12.20's on pump gas and iron heads. still street driven and totally streetable. Some might not like the 3.90's and 3500 stall lol. With suspension work hopefully an 11.99 next spring.
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Old November 13th, 2017, 10:00 PM   #12
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I neglected to post the factory 350 cam specs so you can have a baseline for comparing cams. Below are some factory Olds cam specs

350 cam
.400"/.400" lift, 186º/204º duration @ .050" lift, 250º/264º advertised duration

307 VIN 9 cam
0.440"/0.440" lift, 196º/208º @ .050" lift, 256º/270º advertised duration

455 4bbl cam (except Police, Toro, hi-perf.) 365 hp version?
.435"/.435" lift, 194º/207º at .050" lift, 258º/272º advertised duration

455 4bbl cam (Toronado) 400 hp version
0.440"/0.440" lift, 196º/208º @ .050" lift, 262º/274º advertised duration

As you can see, the factory 350 cam is very conservative and you can get a bump in power just by swapping to a mild aftermarket cam.
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Old November 14th, 2017, 11:20 AM   #13
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He's probably gonna say Erson TQ40 for street...
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Old November 14th, 2017, 11:30 AM   #14
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284/296 adv., 220/[email protected] with .504 lift
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Old November 14th, 2017, 12:38 PM   #15
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He's probably gonna say Erson TQ40 for street...
Nope;-).
Either the one I did for Christian or maaaaybe a Hi flow AH. 220/[email protected].
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Old November 14th, 2017, 02:44 PM   #16
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Nope;-).
Either the one I did for Christian or maaaaybe a Hi flow AH. 220/[email protected].
what is the best EFI package for my 350?
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Old November 14th, 2017, 04:28 PM   #17
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what is the best EFI package for my 350?
I'm guessing you mean a throttle body type system?
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Old November 14th, 2017, 04:35 PM   #18
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Something a long the lines of a Holley Sniper set up
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Old November 15th, 2017, 05:30 AM   #19
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Something a long the lines of a Holley Sniper set up
Then get the Sniper if that's what you're looking at. That wouldn't be my choice, my choice would be the Terminator but very few people seem to want to step up to that.
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