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Old 10-31-2003, 12:24 PM   #1 (permalink)
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Best SBC cam?

I was wondering if anybody had any experience with aftermarket cams for what we do? I know almost nothing about cams, but am interested in trying a different one in my Jeep. I want to up power in the (obviously) off-idle RPM's.

Which brands and/or intake/exhaust lift cams are good for this? Engine is a stock 1988 TBI 305.
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Old 10-31-2003, 12:50 PM   #2 (permalink)
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YOUR BEST BET IS TO CALL THERE TECH LINE THEY DO A GREAT JOB ON PICKING A CAM. I HAVE BUILT MANY RACE AND FACTORY ENGINES AND HAVE A GOOD GRASP ON CAM SELECTION. I HAVE CALLED THEM TO COMPARE JUST FOR FUN. THEY GOT IT ALMOST PERFECT EVERY TIME
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Old 10-31-2003, 03:03 PM   #3 (permalink)
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Call the tech lines of the major companies. The only people who could help you here is someone with the same motor, type of transmission, gearing, tire size, and weight. The cam really is the brains of the motor and getting a more modern design can really wake up an older motor if the rest of the engine is up to the increased output.
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Old 10-31-2003, 04:01 PM   #4 (permalink)
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comp cams....Summit part number cca-12-388-4.
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Old 10-31-2003, 04:08 PM   #5 (permalink)
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Hopefully with an 88 block you've got a hydraulic roller cam which can be very potent. Even though you've got a smaller displacement you will still gain a lot of mid power from a cam with a longer duration on both ports. Check the crane and comp cam catalogs, they probably already have cams designed for your motor.
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Old 10-31-2003, 04:13 PM   #6 (permalink)
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Just stay away from cams that have less than 112* of lobe seperation, keep the overlap down. TBI motors are controlled by vacuum, they dont like large overlaps.
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Old 10-31-2003, 06:28 PM   #7 (permalink)
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Call the Comp Cams cam tech line... Probably nothing bigger than a High Energy 262 and probably the HE 252 might be better since you only have the 305. I like the 268 line in 350, 383's and 400. They are pull well down low in the 400's with high compression.

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Old 10-31-2003, 10:36 PM   #8 (permalink)
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If that TBI is the factory system you need a cam for your computer. Comp cams has them call them.
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Old 10-31-2003, 11:15 PM   #9 (permalink)
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The TBI system doesn't work well with performance mods. I am kind of thinking that you may be better off going with 1.6 ratio rockers instead of a different cam. That may work pretty good with the factory fuel injection.
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Old 10-31-2003, 11:58 PM   #10 (permalink)
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I run the Edelbrock cam for the 305/350 TBI motor, it works great with my stock TBI setup.
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Old 11-01-2003, 12:56 AM   #11 (permalink)
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Quote:
Originally posted by Brutpwr
Call the Comp Cams cam tech line... Probably nothing bigger than a High Energy 262 and probably the HE 252 might be better since you only have the 305. I like the 268 line in 350, 383's and 400. They are pull well down low in the 400's with high compression.

Jason

Just comparing the specs on the Chevy cams to what works well on my 5.0 (very close displacement to the 305). The 268 series is very similar to the Ford racing E303 Cam. When I was running the E 303 cam, the engine ran like a raped ape,...provided I was above 1100 rpms, when I asked it to get it awn, and it didnt even notice that there was a range between 1100 and 1700(wanted to past 1700 with the slightest throttle or drop below with the slightest ease of the throttle) . It was very impressive on the street provided I didnt miss a gear shift,(not easy to do with an NP435). Not so good on the trail as it would fall flat on its face, from a low RPM (500rpm), to full throttle transition.
When I went to the B303 Cam (along with some mild induction, and computer mods to compliment the longer duration and less lift) I lost some rocket launch high rev power, but the usable power band was outrageousley widened, and is awsome in the very low to upper mid range.
The B303 Cam is a .224* duration, with a .480" lift.
That would be a closer equivelant of probaly the 280H series or maybe the 270H.
These smaller displacement engines seem to really bennefit from the longer duration and shorter lift, for off road applications,(provided the fuel regulator and computer programming, doesnt load up the engine, comming off idle).
My engine is extremely strong from as low as 400 rpm, under load, (such as 3rd gear very slow transitions) to, instant(less than a second) 2700 to 3000 rpm launches, without even thinking about having to side step the clutch. And I never really go full pedal.
It was still very strong on the street also, when I was using it for street driving.
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