360 and 390 ignition timing

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Apr 13, 2002 | 06:37 AM

jowilker

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From: Creedmoor, North Carolina

360 and 390 ignition timing

Apr 21, 2002 | 06:36 PM

MAHinton

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From: Kansas

360 and 390 ignition timing

What is the proper igition timing for a 360-turned-into-a-390 in a 1974 F100 two wheel drive. 360 sticker (still on valve cover) says 3 BTDC, but the mark on the balancer is at 6 BTDC, based on my mechanic at the time I rebuilt the engine. Stock engine bored 30 over, 2 barrel, breakerless ignition, C6 auto.

Also, in a 76 F150 4X4 with a 360 and a C6, what would the proper igition timing be? I'm guessing 3 before, based on the sticker in my 74, but want to find out from those who know more than me before I mess with it. No sticker on valve cover, has a 4-barrel intake (390 factory, I believe).

Thanks.

Matt

Apr 21, 2002 | 06:55 PM

Vampiro

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From: Canada

360 and 390 ignition timing

if it's 3 put the timin so the marks lines up roughtly at 1/2 before the 6 line from the last line or beginning

Apr 21, 2002 | 11:07 PM

DrFord

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360 and 390 ignition timing

It has been my experiance that best performance is acceived around 10-12 deg.
on My 390 factory timming calls for it to be set at 6* but I set it back to 11* and that really woke it up. If I'm not mistaken the 6* is really an emissions timming.

Apr 24, 2002 | 02:59 PM

CRJ900

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From: virginia beach

360 and 390 ignition timing

6btc is correct. but like the poster said before you'll run a lot better on 10 or 12. I was running mine on 24 for a while.

Apr 25, 2002 | 01:29 AM

MAHinton

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Joined: Jan 2002

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From: Kansas

360 and 390 ignition timing

A guy in the local Ford service department also said around 10 BTDC. I might try it, but I'm "dieseling" now at 6 (or there abouts). I've just gotten in the habit of shutting it off in Drive or Reverse so it won't sputter. If I'm running at 10 or more, won't that just get worse? Or am I thinking backwards?

Thanks for all the input so far.

Matt