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72 Monte Carlo

Camshaft choice

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I just bought a 70 Chevelle 402 350 HP 2 bolt main complete motor. It has cylinder heads # 3964290 - 69-70 oval port, closed chamber 101cc, and 10.25:1 compression pistons in it.

I'm wanting to put a new cam, lifters, valve springs, and roller tip rockers in it.

My 72 Monte Carlo currently has a 396 SBC Stroker motor with only cam break-in time and 1/4 of road trip on it. It has a turbo 350 trans, 28" tall rear tires, and a 12 bolt posi with 2.73 gears. I plan on getting either 3.31 or 3.55 gears for it later on.

I've got Hooker Competition long tube headers, an Edelbrock Performer 2-0 intake, and a Holley 3310 780 cfm carb for it.

I've been looking at the Lunati Voodoo 60201 and 60202 cams. The lunati tech said that I should go with the 60201 cam because of it being a heavy car, and the rpm of that cam is 1000 - 5500 rpm. 

I want it to be a good street driver with a slight lope at idle, but it needs to have some great torque too.

Does any fellow Monte owners have any sound bites of these cams, and real world experience with them?

The last big block 402 I had was in a 74 Chevy Cheyenne Super 4x4 lifted shortbox pickup, with 3.73 gears, 4" lift, and 35" tires. I had a Crane 272-H10 cam in it and it was a torque beast.

Any other camshafts that I should look at?

Thanks for any advice that you can provide.

Doug

 

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  I'd stick to whatever the cam makers  recommend, but spend the extra coin on a roller.  

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Unfortunately I cannot afford to spend twice the money on a roller cam when compared to a hydraulic or mechanical flat tappet cam.

 

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Posted (edited)

I ' ve seen a good cam for these BBC heavy cars .540" lift with a 218/224 Deg. Hydraulic Comp.cams would work great for your car.Lots of bottom end torque and good mid range 5500rpm (shift points).. I'd run a 2200-2400 stall converter, 3:55 rear gear ratio . The turbo 350 trans is a good choice, for the 1st gear launch. I'm going with this cam in a 427 with same heads. very nice lope it too!! I wanting to find a roller like this. I'm contacting Bullet racing cams about this in a roller. Lunati is a very good choice for cams , and if you do the ground work you will not loose a cam lobe. Attention is in the details!! ( i.e. ,Comp.Cams Beehive Springs,10 deg.locks, rollertip stamped rockers are a must on these BBC cylinder heads)...  post-259-0-61935100-1474727657_thumb.jpg   Also good pushrods. And don't forget Stellite exhaust inserts and stainless valves. Just my 2 cents........

Edited by 420ponies
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I think the 201 is too small for a muscle car. Might be good in a boat, or a motorhome.

I ran the 202 in my otherwise stock 454 and even with it's low compression I got decent vacuum, mileage, and a sound from the tailpipe that gave the impression something might be lurking under the hood. I had a comp xtreme 286 before the voodoo and i liked the voodoo better. A big block engine has enough torque that you will never notice any loss in low speed grunt with the larger cam vs the smaller one, but you very well might notice a difference at higher rpms.

Funny, I tried to look them up at Summit, and the part numbers are different, or have changed. Both the voodoo cams have good descriptions with them. I think with the higher compression you are running, the larger cam will be more pump gas friendly.

Summit numbers: Voodoo 10110701, and Voodoo 10110702. Both of these are hydraulic flat tappet cams.

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The Lunati Voodoo cams are as follows;

10110701

Int 256*/Exh 262*

@.050 Int 213/Exh 219

Gross lift Int .515/Exh .530

LSA/ICL 112/108

1000-5500 rpm range

 

10110702

Int 262*/Exh 268*

@.050 Int 219/Exh 227

Gross lift Int .530/Exh .542

LSA/ICL 112/108

1400-5800 rpm range

 

10110703

Int 268*/Exh 276*

@.050 Int 227/Exh 233

Gross lift Int .542/Exh .554

LSA/ICL 110/106

1800-6200 rpm range

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that's them.

Once you get into the 110 LSA cams, you loose vacuum and brakes can be an issue, Sadly, they also give that rotten idle that sounds good to the ear.

The bigger the engine, the more cam it will take. A 454 might be happy with the 703, but the 396/402 engine might find it a bit much for a daily driver.

It;s always better to error on the small side...that's probably why the cam guy recommended the 701,

No matter what cam you choose, it's bound to be better than the stock cam because of the added lift the aftermarket cams give. Stock cams are around 480 max lift I think...to go bigger you will need long slot rockers and matching springs, as the stock pieces won't handle larger lift.

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The Erson E119816 roller cam in my 350 installed by Quinlan Automotive in INDY on the tube it cam in has

510/510

218/226

112 degree

I do not under stand all of this but thought I'd share anyhow.

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camshaft selection is a tough decision. It determines the behavior of your engine like no other ad-on piece.

Mechanical and roller cams are hard to compare. Rollers get the job done with much less duration, so a roller cam with good specs ends up having a decent idle, while the mechanical (flat) cam ends up with a rough idle...doing the same job. 

and small block engines have different needs than big block engines. Comparing cam specs between the two only causes confusion.

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Call Chris at Straub Technologies (straubtechnologies.com). He specializes in roller cams but will recommend and sell flat tappet cams as well. Be ready to answer a bunch of questions about your engine and car, but I promise he'll set you up and you won't be disappointed.

or Mike Lewis Racing Engines (lewisracingengines.com) is closer to you. He can do the same thing. Don't let the "racing engines" scare you, he won't recommend something you won't be happy with.

Both are very reasonable and good at what they do.

Trust the experts, not the hype. I'll never buy another catalog cam again. 

Scott

 

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