Cam Selection Help - Team Camaro Tech
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post #1 of 16 (permalink) Old Feb 6th, 07, 05:52 PM Thread Starter
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Cam Selection Help

Hi:
Need some help selecting a cam for my engine re-build.
What I have:
350 CI 0.060 over
10.5:1 pistons
Dart SS Iron heads 2.02/1.60
Edlebrock air gap manifold
4-Speed
4:11 axle ratio
manual brakes
1 5/8 primary tube headers

Car is driven on Saturday nights...

I was thinking of the old 30-30 cam remake from Comp Cams or their 294 series solid lifter.
Thoughts?
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post #2 of 16 (permalink) Old Feb 6th, 07, 06:18 PM
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Don
 
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Re: Cam Selection Help

How bout something in the H268 range. This is a good all round workhorse cam. Don't have a lot of overlap.

Don
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post #3 of 16 (permalink) Old Feb 6th, 07, 07:15 PM
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Talking Re: Cam Selection Help

Quote:
Originally Posted by zdld17 View Post
How bout something in the H268 range. This is a good all round workhorse cam. Don't have a lot of overlap.
I second that, however, Same motor with a XM274 from Comp was ALOT of fun!

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post #4 of 16 (permalink) Old Feb 6th, 07, 08:09 PM
 
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You want a mild Thumper then please consider either the old Isky Z-25 or Z-27 solid cams!! HECK, I will also say the Z-30 too, even tho you are below 11 to 1!!

Sucker should run AND rpm GREAT with any of them!!!!!!! Smaller, more grunt, bigger more top-end sorta deal.......

You got the reg and the compression so use it..

pdq67

PS., and I do figure in a 360" SB, the old GM 30-30 solid cam will do fine at 10.5 to 1 vs 11 to 1 CR. in the smaller 327's due to it's longer stroke....................



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post #5 of 16 (permalink) Old Feb 7th, 07, 07:51 AM
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Re: Cam Selection Help

i agree with pdq...

with your compression, you'll want a tad more overlap.

the 30-30 is a great choice, and still hard to beat.

A
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post #6 of 16 (permalink) Old Feb 7th, 07, 08:18 AM
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Re: Cam Selection Help

Quote:
Originally Posted by 69z28boy View Post
i agree with pdq...

with your compression, you'll want a tad more overlap.

the 30-30 is a great choice, and still hard to beat.

A
Why would he want more overlap? What does that have to do with the compression?
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post #7 of 16 (permalink) Old Feb 7th, 07, 12:31 PM
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Re: Cam Selection Help

I like my old-school brethren touting the old stuff! Yeah, the 30-30 would rip with your 4.11's and 4-speed.

Or, Comp's 280H if you're in to flat-tap hydraulic. The 268H is great but may ping some with your 10.5:1 CR.

No secret, with headers, good heads, and good flowing exhaust, I like a good single pattern cam.

My opinion,..worth what you paid.
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post #8 of 16 (permalink) Old Feb 7th, 07, 01:01 PM
 
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Re: Cam Selection Help

Comp XS282S.
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post #9 of 16 (permalink) Old Feb 7th, 07, 03:44 PM
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Re: Cam Selection Help

Quote:
Originally Posted by onovakind67 View Post
Why would he want more overlap? What does that have to do with the compression?
if he doesn't want too run 110 octane all the time,

the additional overlap of the 30-30 (as compared to a smaller camshaft will bleed off some compression.

plus he has the gearing and tranny to run the 30-30 properly.

the new cams with faster ramps have less seat to seat duration, and thus have less overlap... resulting in higher cylendar pressure and higher octane requirement.

so a small modern cam might make a ton of torque, but he'll blow the tires off the car and have to keep race fuel in the tank... hardly a street car.

thats what I was getting at.
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post #10 of 16 (permalink) Old Feb 7th, 07, 05:09 PM
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Re: Cam Selection Help

Quote:
Originally Posted by 69z28boy View Post
if he doesn't want too run 110 octane all the time,

the additional overlap of the 30-30 (as compared to a smaller camshaft will bleed off some compression.

plus he has the gearing and tranny to run the 30-30 properly.

the new cams with faster ramps have less seat to seat duration, and thus have less overlap... resulting in higher cylendar pressure and higher octane requirement.

so a small modern cam might make a ton of torque, but he'll blow the tires off the car and have to keep race fuel in the tank... hardly a street car.

thats what I was getting at.
What I'm getting at is that overlap has nothing to do with compression. The overlap period occurs at the end of the exhaust stroke. The event that controls cylinder pressure is the intake closing point.
I wouldn't worry too much about blowing the tires off with a mild 355" motor, you won't get the torque multiplication with the 4-speed you get with an automatic. For a good street car you want 'a ton of torque', fumbling around trying to find some horsepower in the rpm range you spend most of your time in isn't productive.
If you take your time and do things right you can run quite a bit of compression using 91-92 octane pump gas. We have a 10.8:1 331" small block street car with a 'modern' 240/240 cam in it that runs very well on California 91 octane. I have a 10.3:1 406 daily driver with a 224/224 cam that runs on the same gas.
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post #11 of 16 (permalink) Old Feb 7th, 07, 10:27 PM
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Re: Cam Selection Help

yes... my point was simply that a larger cam, especially an old school cam with slower ramps will bleed of compression and allow use of lower octane..

i had an old Comp Hyd 292h in a 350 that was 11 to 1... it would ping on anything but a mixture of race gas..... i went to a 30-30 solid and it ran everybit as good, but could run all day on Sunoco 94 (unless i floored it in 4th gear at about 15 mph) LOL
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post #12 of 16 (permalink) Old Feb 8th, 07, 05:37 AM Thread Starter
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Re: Cam Selection Help

Thanks to everyone for the input.
I am leaning towards the 30-30. Silly question... does anyone have any information on the new Comp Cams "thumpr" series??? Just curious.
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post #13 of 16 (permalink) Old Feb 8th, 07, 07:18 AM
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post #14 of 16 (permalink) Old Feb 8th, 07, 08:05 AM
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Re: Cam Selection Help

There was recently a VERY long post on Team Chevelle regarding the thumper series





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post #15 of 16 (permalink) Old Feb 8th, 07, 05:41 PM
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Re: Cam Selection Help

I have the 401A6Lun in my 9.5-1 350. It is ground on 112lsa, and runs like a scalded dog with the 180cc AFR's on there. Real fun to see the jaws drop on my mustang victims in my heavy short bed truck. LOL...

Solid; Fair idle. Excellent Pro Street cam for 355–400 cubic inch motors. Needs 2500–3000 RPM stall converter, headers, 10:1 compression ratio, and 3.73 or better gearing.


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