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post #1 of 8 (permalink) Old Jul 11th, 00, 01:36 AM Thread Starter
Join Date: Jul 2000
Posts: 2

Hello, I think this site is great. Im looking for help with a street driven 350. Its a standard goodwrench 350 with headers, 700r4 trans. Ive deduced that the edelbrock carb and performer intake are good choices, my question is can I do better than the performer cam? I am uninterested in emissions as it is not a worry, so can I run something with a tighter lobe separation than the 112lsa of the performer. I was wondering if an RV cam with a 108 lsa would be a good choice like Comp cams 206/212 .425 .440 108 LSA or should I go for the 260H 212/212 .444 .444 110 LSA
I dont have a tach, dont know my axle ratio but I do know that Im looking for street 0-70 performance and not much else. Will I be revving past 4200 rpms given these conditions? Any input will be appreciated. Thanks in advance.
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post #2 of 8 (permalink) Old Jul 11th, 00, 03:14 AM
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Call Comp Cams and talk to them. They will be able to advise a good cam.

68 RS, Ash Gold,pwr windows,Hounds tooth
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post #3 of 8 (permalink) Old Jul 11th, 00, 06:44 AM
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Location: Racine WI
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You should check your gear ratio first though.One of the first things a Tech line will ask is your axle ratio.This can make a big difference when picking a cam.A cam that works well with a 4.11 might not be so hot if you are running 2.73's.A little extra homework done now,will pay off later.Just my .02.

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post #4 of 8 (permalink) Old Jul 11th, 00, 07:07 AM
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Axle ratio, compression and converter are all important. Don't mismatch your cam and converter, or you'll be unhappy.

My advice, unless you are willing to take some big steps, leave well enough alone until you are.

For a motor like that I would be inclined to run with an L79 cam(2200-5500 rpm)(Its my favorite mild sbc cam), a 2800 converter, some 3.42's and your all set. As you can see though, you are going to open up every piece of your driveline. You may already have gear though.

Check your glovebox for the rpo codes...look for these
G80(posi) and anything else with G...this will be your gear designation.

"A days pay on the wild side"
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used to have 84' z28 with all the goodies
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post #5 of 8 (permalink) Old Jul 11th, 00, 03:04 PM
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Location: Las Vegas, NV
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I hope you don't mind if I piggyback this discussion, but I'm having an engine assembled as we speak and the camshaft is a point of contention.

I'm talking a daily-driven convertible with Turbo 400 and 3.08 rear. I'm having the engine built with 9:1 CR (that's not TOO much right?). The builder wants to sell me an RV Cam (.422/.440), I'd considered the L79 (.447/.447?), but I'm thinking an L82 (.450/.460). I'm looking for streetable with some cajones but don't want to play king of the dragstrip/boy racer. Suggestions/Input?
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post #6 of 8 (permalink) Old Jul 11th, 00, 03:45 PM
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Location: Crofton, MD
Posts: 126

One thing all you guys need to think about is your heads. Your cam and heads should really complement each other. If your heads flow better on the intake than the exhaust side (many heads do) then make sure you have a dual pattern camshaft (one with more duration on the exhaust side than the intake side. Call Comp Cams, Crower, or Crane. Any will give you a good idea of what you need to match your setup. Steve Laabs
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post #7 of 8 (permalink) Old Jul 11th, 00, 06:00 PM Thread Starter
Join Date: Jul 2000
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Thanks to all, I spoke with comp Cams and they suggested the XE256.Anyone have experience with this type of grind either positive or negative. Thanx again
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post #8 of 8 (permalink) Old Jul 12th, 00, 11:14 AM
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Location: Dallas, Texas
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The lobe separation angle (LSA) does not determine peak power, but where in the RPM range power will peak.

All other cam specs being equal, a narrow or tight (108*) LSA moves the power range down in RPM and produces a narrow powerband. Cams with a tight LSA tend to have a lot overlap and idle poorly.

Again, all other specs being equal, a wide LSA (114*) produces a wider powerband. A wider LSA provides less overlap so idle quality is improved.

The point is that you can't necessarily look at LSA by itself to determine the cam you want.

POP D TOP - the specs you provided were for lift. You can't just look at lift to determine performance potential BUT, in general, increased lift generates increased power assuming all other cam specs are the same.
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