Total Advance for '87 351W
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Freshman User
Joined: May 2004
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Total Advance for '87 351W
Can one of you more experienced gents advise me of the total advance for a '87 351 W 4 BBL carb'd engine? The initial idle advance is set to 6-8* and mechanical is maxed at 36* for a total of 42-44* but the engine still pings and diesels badlyy uphill or with a load. Also, it seems the maechanical advance comes in way too early. I tried heavier springs in the distributor but the improvement was marginal. Thanks for your help.
Lead Driver
Joined: Nov 2002
Posts: 9,557
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From: Concord, NC
That seems like an awful lot of timing to me. EFI mustangs run 40 degrees of total timing, and that is in a high performance car. I would think 35-36 would be sufficient total advance for a truck motor, maybe someone else can tell you the exact specification. I'd time it by ear until the pinging goes away and see how it runs.
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Freshman User
Joined: May 2004
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Thanks for advice. I've tried to time by "ear" but the setting is near zero advance at idle and it starts and runs like a dog. I'm going to limit the max mechanical advance to 26* by changing the stops in the distributor; this will kepp total advance to 26* plus 6-8* at idle = 32-34*.
