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Old 05-31-2014, 07:52 PM
olddog olddog is offline
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Join Date: May 2006
Location: St. Louisville, Oh
Cobra Make, Engine: A&C 67 427 cobra SB
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Default 347 how much mechanical advance at what rpm

Ford factory 5.0 block stroked to 347 cid
10.5 compression
Edle performer rpm heads - port matched to gaskets intake and exhaust
cam 236/242 @0.050" .575" lift at valve LSA 110
intake Edle Vic Jr single plane
Running premium 93 octane pump gas

What would you recommend the total (base + mechanical) advance be and at what rpm would you want it all in buy.

I am puzzled that Ford, on the 89-93 Mustang GT 5.0, the WOT timing table is:
RPM Deg Adv
1000 - 8
1800 - 18.5
2150 - 21.5
2600 - 22.5
3500 - 22
5000 - 26

Talked to a dyno tuner who said a stock 5.0 typically makes best power on premium gas around 28 deg. I didn't get an rpm. Even that seems low to me.
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