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Old 01-11-2010, 05:54 PM
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BBC Ignition timing ?

Hello guys i Have a 396 BBC and i'm wondering about what i should run my timing, I have a locked out MSD distributor.

I Have 408 Cid BBC. (396)
10.5 compression.
GM Rect. port 990 heads, worked with 2.19"/1.88" valves.
Solid roller camshaft. - 254/254 @50" lift, .644"/.644" lift
Edelbrock Performer RPM dual plane manifold.
Quick Fuel 850 CFM
Crane Gold 1.7 Roller Rocker arms.

What would be best Jetting for the carb and Ign timing and spark plug gap for my setup ?

I don't have start retard box in the car, is that a must ?
I have a mini starter that is supposed to have low gear ratio..

Best regards

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Old 01-11-2010, 08:20 PM
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Big blocks like to have around 36-38 degrees total timing.Start your plug gap around 0.035,thats a pretty good starting point.To check your jetting,go for a couple of WOT runs and check the plugs,dont let it get too lean.Sounds like a potent combo,whats it in ??
Guy
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Old 01-12-2010, 12:54 PM
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Thank you for the advice's
The engine is in an old Jeep CJ-5

Do you think it would be OK to run without retard box with locked out timing ?

Best regards.
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Old 01-12-2010, 02:26 PM
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I have never run my big block with the timing locked out so I'm not sure,but I think that it will be hard to start with the timing locked out.Can you "unlock" your distributor ??
What are you doing with the Jeep ??
Guy
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Old 01-12-2010, 04:10 PM
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A lot of crate motors don't use vacuum advance. Medium weight Accel springs are supposed to be 12-13 degrees advance at the cam. 12 degrees static at the crank you have 36-38 degrees total. And the thing starts great.
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Old 01-12-2010, 04:16 PM
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I know the Jeep is not your typical thing you would stuff a BBC in but... the Jeep is just a toy, i might go sand drag racing with it, hoping the engine might be 350+ hp

Denunger by saying the timing is locket there's no advance, let say the ign timing would be at 38 at maybe 5000 rpm, (max advance with normal msd dissy) it is also going to be 38 at start/1500 rpm, it just will be at the same timing everywhere.
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Old 01-12-2010, 04:27 PM
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You should have 350 + hp easily enough,maybe more like 450 with the parts you are using.
Guy
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Old 01-13-2010, 06:39 PM
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If the mechanical advance is locked out the timing does not change with rpm.
If the timing is in fact locked out set the timing at 38 deg BTDC at idle.

To aid hot starting install a simple dash mounted SPST toggle switch to interupt the spark power while hot cranking. Get 'er spinning over and them throw the switch and it will fire easily without starter strain.

If you have a MSD spark box the switch goes on the small red power on switching wire that controls the box.
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