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Old 02-18-2010, 02:24 AM
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Camshaft Advice for 396 BBC ?

Hello Fellow Hot-Rodders
I Have 408 Cid BBC. (396)
10.5 compression.
GM Rect. port 990 heads, heavily ported with 2.19"/1.88" valves.
Solid roller camshaft. - 292 ADV, 254 @.050" lift and .644" lift,
Edelbrock Performer RPM dual plane manifold.
Quick Fuel 850 CFM Race Carb.
Comp 1.7 Roller Rocker arms.
MSD 6 ignition w. Pro-Billet distributor.

The engine is Jeep CJ5 that's on 36" tires.
I have TH-350 with 2500 Rpm stall converter and 4.10:1 gears.

I wan't to go to a smaller Solid roller cam, I want to keep the rpm range from 2000-6000. But as is the engine delivers huge's amount of torque and power from ca 3000 rpm and UP.

What would you recommend ?
I want to be in the pump gas zone (93 Oct)

Best regards.
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Old 02-18-2010, 07:10 AM
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I'm in the process of building a 468 right now and i'm gonna be going with a hyd. flat tappet cam. Either Extreme Energy or Extreme 4x4. Both give you good torque from the git go. Leaning toward the Extreme 4x4 part# 11.239-3. It's good from 1600-5800 rpm. Hopefully that helps alittle!!
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Old 03-01-2010, 04:37 AM
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I'm Open for flat tappet camshaft, as long as i can run it on 93 oct pump gas
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Old 03-01-2010, 04:53 AM
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At 10.5-1 in a BBC, you can't go smaller with the cam duration from what you have and expect it to run on pump gas.

Does it even run on pump fuel now at 10.5-1??
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Old 03-01-2010, 05:47 AM
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Yes it run's fine, no ping or anything like that.
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Old 03-01-2010, 07:39 AM
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you are correct with wanting a smaller cam (judging by the gears, stall, and tires).

However, the compression ratio would be to high to drop a cam size.

First, double check your compression values. If the cr is correct (10.5:1) then consider dropping the cr down to 9.0 to 9.5 and use a cam in the 218 to 224 degree range with 112 lsa.
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Old 03-01-2010, 12:38 PM
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You might want to think twice about using a flat tappet cam in a BBC. A friend of mine who builds them for a living will not install a flat tappet cam into one without the owner signing a release form that states when the cam goes south, it is not the shop's fault. He says the BBC is the worst motor out there for eating flat tappet cams.

Think about it. No amount of money saved by using a flat tappet over a roller is worth the hassle of completely disassembling the motor to clean out the shrapnel from every nook and cranny, then having to buy a roller cam ANYWAY, along with all the gaskets, seals and time required to reassemble the motor.

Buy a roller cam and be done with it.
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Old 03-02-2010, 02:01 AM
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Comp cams PN 11-691-9 CB 280A-R10

You can look up the specs here www.compcams.com
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Old 03-02-2010, 10:39 AM
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You can find it on page 221 here....
http://www.compcams.com/products/212-225.pdf
11-691-9 will not show up in the Spec Card Search.
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