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454 bb Timing question


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skipin45
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Oct 8, 2013, 5:55 PM

Post #1 of 11 (1386 views)
454 bb Timing question Sign In

Does anyone know where to find the specs or know what to set the timing for a 1989 454 bb ,40 over it has a steel crank 4 bolt mains 800 edelbrock carb aluminum intake rearend has 308 gears th 350 trans th400 tork converter hurst promatic ratchet shift Hei ignition. This is all the guy gave me when I bought the car.


nickwarner
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Oct 9, 2013, 1:35 AM

Post #2 of 11 (1370 views)
Re: 454 bb Timing question Sign In

Are you using a vacuum advance carb?


skipin45
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Oct 9, 2013, 4:47 AM

Post #3 of 11 (1364 views)
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I don't believe so its a Edelbrock #1412 Carburetor, Performer, Gasoline, Square Bore, 800 cfm, 4-Barrel, Manual Choke, Single Inlet I believe



skipin45
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Oct 9, 2013, 3:07 PM

Post #4 of 11 (1353 views)
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I was wrong it is vacuumed


nickwarner
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Oct 10, 2013, 1:21 AM

Post #5 of 11 (1346 views)
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my bad, I mistyped. Your distributor has a vacuum advance on it right?


skipin45
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Oct 11, 2013, 6:51 AM

Post #6 of 11 (1325 views)
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I believe so


nickwarner
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Oct 12, 2013, 1:08 AM

Post #7 of 11 (1317 views)
Re: 454 bb Timing question Sign In

The 89 would've had a TBI and electronically controlled distributor, so here is the spec for an 86 with a 4 barrel carb.

IGNITION TIMING
1986 Chevrolet Truck C30 1 ton P/U 2WD 7.4L 4BL 8cyl
The Ignition Timing


Application:
With automatic transmission


8 DegreesBefore top dead center*Set at warm idle speed (700 RPM)*Distributor vacuum hose disconnected & plugged*Transmission in drive (parking brake engaged)*All accessories off


skipin45
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Oct 12, 2013, 7:11 AM

Post #8 of 11 (1310 views)
Re: 454 bb Timing question Sign In

Thank you so much. Can I have the timing for the electronically controlled distributor also in case im wrong about it?


nickwarner
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Oct 12, 2013, 3:14 PM

Post #9 of 11 (1305 views)
Re: 454 bb Timing question Sign In

You cannot set the timing on an electronically controlled system. The distributor can only go in one spot. If you are a tooth off, it will alter your timing and make it run badly. However, it would require the PCM for the TBI motor to even run and without having the TBI hooked up to it the PCM would have no idea what to do.


Hammer Time
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Oct 12, 2013, 5:09 PM

Post #10 of 11 (1304 views)
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The base timing is always adjustable if it doesn't use a Crank sensor and an 89 would not use one.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
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Oct 12, 2013, 6:26 PM

Post #11 of 11 (1302 views)
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If this is a EST HEI distributor, you need the computer to be able to control ignition advance. Even then the advance wouldn't be right because the characteristics of the engine have been changed. You really need a mechanical distributor or one that you can change the total advance on if your have completely eliminated the fuel injection system.





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