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Old 02-26-2008, 11:20 AM
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So.I.bought.this.cam...

comp.274H
.490/.490

it's.already.in:

385CI
10.44:1
Forged/balanced.everything.
alum.heads.(2.02/1.60)190cc.runners/64cc.combustion.chambers.
summit.racing.intake.(dual.plane)
holley.750
i.think.i'm.going.for.a.700r4.
4.08rear.
2200stall
total.car.weight.of.2400-2700.lbs.

anything.you.guys.wanna.warn.me.about?
or.tell.me.if.the.cam.is.right?
or.if.i.should.go.up.in.stall?
i.wanna.be.able.to.drive.to.jersey.on.the.thruway. to.smoke.my.brothers.new.
corvette.without.the.tranny.burning.up.

also...do.you.think.the.stock.700r4.will.handle.th is.power.without.blowing.up.
the.gearbox?

thanks.guys.

(and.yes.my.space.bar.is.broken.)

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Old 02-26-2008, 01:08 PM
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I think I have a spare keyboard I can send ya!! LOL

The stock 700 is marginal behind a wheezer engine, let alone a built one. First thing that usually goes is the sun shell, then the 3-4 clutch pack. If it's not been built up well, it's lifespan will be minimal.

Mark
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Old 02-26-2008, 03:17 PM
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do.you.think.the.cam.was.a.good.choice?

and.what.tranny.would.you.recommend?

i.don't.wanna.spend.a.butt.load.on.a.super.built.o ne.
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Old 02-26-2008, 03:27 PM
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Cam's too short.
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Old 02-26-2008, 03:35 PM
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I think the cam'll be good to get you to Jersey on the thruway. Even in loads of traffic, it'll be fine. And, it'll wake the motor up pretty well. What are the heads? How large a shot are you gonna put on it? What does the car weigh? And, are you really serious about smoking the Vette? Which Vette?

Pat
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Old 02-26-2008, 04:23 PM
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Cam's too short.
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Old 02-26-2008, 10:30 PM
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pro.comp.heads.sadly...

the.car.weighs.like...2400-2700lbs.fully.dressed.

only.an.01.vette.

and...what.cam.do.you.recommend.then.if.mine.is.to o.short?
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Old 02-26-2008, 10:31 PM
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and.probably.no.laughing.gas.i.want.an.NA.beast.
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Old 02-27-2008, 12:40 PM
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12-14 additional degrees on the duration and more stall on the converter. Call up your favorite cam grinder and get a recommendation. I suspect you'll discover that the cam you plan to use will make too much cylinder pressure with 10.44:1 static compression ratio. It all depends on the fuel you plan to use. 10.44 with the short cam is too much for pump gas in my opinion.
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Old 02-28-2008, 12:53 PM
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more stall? and what if i put 1.6 rockers on it? and raised up the lift? the only thing is i haven't decided what tranny to use. either the 700r4 or the turbo400 but i want a fourth gear overdrive... i'm also broke though. haha. and wont the cam company want to know this?
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Old 02-28-2008, 01:49 PM
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tech guy is right.

You need a 292H with a 3000 stall.
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Old 02-28-2008, 04:25 PM
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I looked up the 292H and I saw this...

This Magnum Hydraulic Comp Cam fits the B/B Chevy 396-454 ci. The advertised duration is 292/292 and the duration @ .050 is 244/244. The gross valve lift is .550/.550 with a lobe separation of 110. The 292H series cam is for the serious street / strip type car. An aftermarket torque converter should be used as well as headers, intake manifold, and an increase in compression. The 292H series cam will have a radical / rough idle. Magnum Cams are designed to be very aggressive and are specifically designed for the street enthusiast looking for more power with that pro street sound. These cams are intended for performance oriented vehicles the will see little street use. The idle characteristics of your engine will change due to the increased duration and overlap of the Magnum Cam Series.

that doesn't sound like what i'll want. are you sure? and why would i want that much stall? wouldn't my tranny burn up if my converter isnt locking until that late? i really didn't want a lot of slippage.
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Old 02-28-2008, 05:02 PM
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actually i just called the comp cams guy and I told him my setup and he actually recommended the cam that I have. (274H) he said that it will give me a perfect torque curve, give me enough vacuum to run power brakes, and it will tolerate my compression ratio, and work well with my rear end being 4.08 and can use 2200-2500 stall. and i did most of the research on my own. so i'm pretty happy that the cam i already paid for didn't end up being a waste of money.

now i just need to know about timing... i'll search in the forum before i ask though.
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Old 02-28-2008, 05:13 PM
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I also think you need more cam unless you like racing fuel.
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Old 02-28-2008, 05:50 PM
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I run the 292H on the street. it isn't nearly as bad as the description says. sure it idles rough, but runs good right off idle and very good going down the highway. 3000 rpm is the start of it power band which will be at your highway rpms when doing 80.

10.5:1 cr is pushing it with that cam. I would not go any smaller than a 280H.

they make 3000 rpm stall converters that lock up. I ran a 3000 non stall with a 3.90 gear and it was ok going down the highway. What is the weight of your car?

what make of rear end comes in a 4.08??

As for timing. start with 30 degrees total and go up from there. Listen for detonation very closely. Around 36 to 38 degrees total would be ideal, if the engine doesn't ping. 18 to 20 initial (at idle) will help the throttle response and stop the headers from glowing red.

I still think compcam is wrong for recommending such a small cam with that much compression, but that is just my opinion. Hope it works out.
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