When you change cams is where you really start to mess up the Speed Density. Get yourself an EEC tuner and you'll never have to worry about mass air. EVER! You can get by with heads and intake because the vacuum from the stock cam will still be within the limits set by the computer. When you change the cam is where things start to mess up. With the EEC tuner you can program and reprogram your computer over and over to your hearts content. Much better/cheaper than getting a chip and having to have it burned over each time you do a mod. That'll add up real quick. That's what the majority of us GEN 1 Lightning owners do (since all the GEN 1s are speeddensity stock). There's a few that converted to mass air and alot of those guys are going back to speed density. Get the EEC tuner. I wouldn't bother with mass air. You don't need it. Then with the EEC tuner you can mod all ya want.
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1967 Mustang Coupe
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