another cam suggestion question - Chevelle Tech
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post #1 of 12 (permalink) Old Mar 6th, 20, 2:10 PM Thread Starter
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Paul
 
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another cam suggestion question

I have a 396, 9:1 CR, 148 heads, Edelbrock Performer2 intake/750 carb, Hooker super comp headers, 3.07 differential in a 69 El Camino. Currently has a hydraulic cam with specs close to the one used in a 350 hp 396. It's a weekend driver only. Motor does fine but like everyone else I wonder "what if". That being said, are there any suggestion on a more aggressive hydraulic cam that could perk this motor a little more? Yes, I know I could replace it with a 454, and that may happen sometime, but there aren't many miles on this current build.



Thanks

Paul J
'69 El Camino SS
396 CI,Hooker Super Comps
TH400, HEI, Performer Intake, 750 cfm
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post #2 of 12 (permalink) Old Mar 6th, 20, 2:19 PM
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The cam world is yours,
once you get rid of that 3.07 !
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post #3 of 12 (permalink) Old Mar 6th, 20, 3:08 PM Thread Starter
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Paul
 
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Re: another cam suggestion question

Forgot to mention, TH400 trans.

Paul J
'69 El Camino SS
396 CI,Hooker Super Comps
TH400, HEI, Performer Intake, 750 cfm
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post #4 of 12 (permalink) Old Mar 6th, 20, 3:09 PM Thread Starter
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Re: another cam suggestion question

My highway driving is much nicer than my buddy with his 3.73's.
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Paul J
'69 El Camino SS
396 CI,Hooker Super Comps
TH400, HEI, Performer Intake, 750 cfm
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post #5 of 12 (permalink) Old Mar 6th, 20, 3:20 PM
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Re: another cam suggestion question

Paul, I think a cam like this would work perfect for your application:
https://www.competitionproducts.com/.../#.XmKwR6hKiUk
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post #6 of 12 (permalink) Old Mar 6th, 20, 3:52 PM
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Re: another cam suggestion question

I think those 148 heads were the open chamber style for the 265 hp 396 engines.
Have they been worked over or are they stock?
Either way do you know the flow numbers on them?
If you have that, it will be fairly easy to pick a cam that will work well with your combo.

67 SS BBC
4.11's
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post #7 of 12 (permalink) Old Mar 6th, 20, 4:05 PM Thread Starter
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Paul
 
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Re: another cam suggestion question

They are stock. From searching the site, The heads are basically the same as the 325 and 350 hp versions but with a larger combustion chamber for the 9.0-1 compression ratio, 112cc-122cc chambers.

Paul J
'69 El Camino SS
396 CI,Hooker Super Comps
TH400, HEI, Performer Intake, 750 cfm
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post #8 of 12 (permalink) Old Mar 6th, 20, 5:47 PM
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Gerry
 
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Re: another cam suggestion question

Quote:
Originally Posted by Paul J View Post
They are stock. From searching the site, The heads are basically the same as the 325 and 350 hp versions but with a larger combustion chamber for the 9.0-1 compression ratio, 112cc-122cc chambers.
Can you get the flow numbers @ 28 hg? - .100Ē thru .550Ē lift?
Mark @ Vortecpro might know.

67 SS BBC
4.11's
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post #9 of 12 (permalink) Old Mar 6th, 20, 11:15 PM
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Re: another cam suggestion question

hi
compression 9:1cr very limiting
diff gear 3.07 go 3.3 3.4
convertor stall ? easily fixed any thing over stock would be an improvement
head design and flow ??
The above are limiting factors

Use an Edelbrock RPM package as a guide
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post #10 of 12 (permalink) Old Mar 7th, 20, 7:32 AM
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Re: another cam suggestion question

Don't forget about matching valve springs if you go much more than stock lift


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post #11 of 12 (permalink) Old Mar 7th, 20, 9:20 AM
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Jeff
 
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Re: another cam suggestion question

I would keep what you have and play with the timing. Try advancing the initial to 20 and the mechanical to 14 all in by 2400, since you have a 3:08..

That is a perfect street set up. Don't fall for that lumpy cam nonsense and give up bottom end performance and power brakes..
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post #12 of 12 (permalink) Old Mar 8th, 20, 9:20 AM
p40
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butch
 
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Re: another cam suggestion question

stan weiss has a web site with head flow at 28 hg
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