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Trying to mix and match here......help?


Guest Anonymous

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Guest Anonymous

I have a 350 now with the stock bottom end. Im gonna be using the stock heads and was wondering whats the best way to get a lil more extra hp/torque out of them. I plan on running a cam with a long duration and a high lift, complimented by a victor jr. along with some 600 or 650 carb (havent decided). Im looking for my powerband to be a lil higher in the revs. I cant get any information oh the heads right now, but they are off a SBC from a early 70's ride. For compression, I plan on keeping around 9:5. Im new to the world of Mixing and Matching Small blocks so, you fellas are gonna seeing alot of my dumb questions. Viva La Vg30det's!!

Thanks a bunch.

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the victor jr intake works best after reaching about 3000rpm to about 6500rpm, a long duration cam like 240@.050 or above is designed for the 3500-7000rpm range so those parts match ok, but most stock chevy iron heads are meant to run from idle to about 4500rpm thats going to kill the big hp numbers your hopeing to get with that intake and cam, twak.gif and without a good set of headers its almost hopeless cry2.gif to try and get big hp at high rpms, and if you start with a 9.5 compression ratio and add a long duration cam the dynamic compression will be so low youll have a terrible torque curve, look here and fill in the program blanks (you need about 8.0 -/1 cpr btw)

 

http://cochise.uia.net/pkelley2/DynamicCR.html

 

if your staying with stock heads get a smaller cam and a dual plane intake like a performer rpm, if you want better hp, get headers,higher compression and better flowing heads. the secret to a good combo is getting every part to work in the rpm range you want the most power in. 2thumbs.gif

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I agree with Grumpy all the way. Go with an Energizer 272 cam and a Performer intake and you should be good to a strong 5000 rpm. If you plan on building a stronger motor later, go with the RPM intake. You really don't want to run any more than that with a passenger car oil pump and stock rod bolts IMO.

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