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Oct 5, 2010 | 10:55 AM

#61

skyfox10

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Joined: Jun 2003

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From: southwest michigan

Coming back with an update. While I still say I have noticed no power change, gas mileage is another story. 7 tanks of gas prior to to timing advance yielded me 12.5 mpg. I just checked my 6 tanks of gas after the timing advance. And... 15.1 mpg.

Going up more than 20% is not bad at all.

Oct 5, 2010 | 02:54 PM

#62

DIYiT

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Joined: Jul 2008

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Sounds like most of you have SBF engines. What are some of the gains you've seen on the 460? I did my spark plugs, rotor, and cap less than a year ago (maybe 3000 miles on them) and it was PITA to get the plugs nearest the firewall out. Only thing left is to get a new coil and I'd be ready for the 6-liter tune up, but is it worth the hassle since I won't be needing new spark plugs for quite a while (I think they may also be platinum, but I'm not sure)

Oct 5, 2010 | 03:02 PM

#63

skyfox10

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Joined: Jun 2003

Posts: 2,314

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From: southwest michigan

You should have a similar computer setup as the SBF, So i think you'll be fine. I know some older 460 had vacuum advace. Your in a whole different ballgame there.