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350 /300hp cam upgrade

 
wally0143
My first time was in a Chevy
Posts: 186
Joined: 07/09
Posted: 07/09/09 05:15 PM

i have a 70 chevelle with a stock 350/300 hp in it. the compression ratio on this engine is 10.25 to 1. i would like to give it some more power but i dont want to get too crazy. i cant find factory specs for the cam that is in it. im thinking of staying around 220/220 450/450 any help or suggestions would be appreciated  
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D327
I love my Chevy Chevette!
Posts: 6
Joined: 07/09
Posted: 07/09/09 06:05 PM

Check out this link for the factory specs. You can also contact Comp Cams or Crane Cams to get direction on a good cam for your application. Hope this helps.

http://www.kendrick-auto.com/chevrolet_factory_cam_spec.htm  

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wally0143
My first time was in a Chevy
Posts: 186
Joined: 07/09
Posted: 08/13/09 06:18 PM

i didnt find my engine on kendricks list. im hoping someone that understands cams and what durations/ lifts are well mannered but make good power better than i do can help? im not too trusting of calling a cam manufacturer, and would really like to know the stock specs before i proceed. what about springs? how much lift can stock small block springs handle? help!!!!  
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Pontiacman2
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Posts: 891
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Posted: 08/14/09 04:41 AM

If memory serves me right the 350/300hp cam had a .390/.410 lift.
I would recommend a lunati P#LUN-00016LK it has a .458 lift and a RPM range of 1500-5200.  
Pontiacman2
Pontiacman2

Professional Hi-performance engine builder

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chevelle83
I have an SS396 tatoo
Posts: 442
Joined: 10/08
Posted: 08/17/09 05:51 PM

The cam mentioned above is an excellent everyday driver cam with a mild lopey idle I have one in my 70 chevelle 4 speed car and would take nothing for it. It does have just enough vacuum to operate the accessories at about 700 rpms. My car gets 15 mpg with Q-jet carb.  

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wally0143
My first time was in a Chevy
Posts: 186
Joined: 07/09
Posted: 08/20/09 06:41 PM

thanks a lot guys. im closer to making a purchase. two things i need to know: can stock springs handle a cam like this, and, will it require a stall converter?? my car has a th 350 and 3:31 gears.  
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Pontiacman2
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Posted: 08/21/09 04:54 AM

I always recommend using the proper springs.
No the .458lift lunati cam does not require a stall converter.  
Pontiacman2
Pontiacman2

Professional Hi-performance engine builder

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wally0143
My first time was in a Chevy
Posts: 186
Joined: 07/09
Posted: 08/21/09 06:07 PM

are stock springs "proper"?????????? is there anyone that can tell me what the limits of stock springs are? thanks for the help!  
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Pontiacman2
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Posted: 08/22/09 04:43 AM

No, by proper springs I mean the matching springs that lunati recommends for that cam.  
Pontiacman2
Pontiacman2

Professional Hi-performance engine builder

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Pontiacman2
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Posted: 08/23/09 01:35 PM

The reason know one can tell you the limits of stock springs is not all stock springs spec out the same.
Some stock springs will work with that cam well others wont you would have to know what the specs of the stock springs that you have are like how much seat pressure they provide coil bind open spring pressure ETC.  
Pontiacman2
Pontiacman2

Professional Hi-performance engine builder

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tworls350
I love my Chevy Chevette!
Posts: 7
Joined: 08/09
Posted: 08/26/09 07:48 PM

look up summit cams. i have one and its not to eratic just a nice cam its 224/234 duration and 465/488 lift and it was cheap.  

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