Originally Posted by fantastic88
A stock L67 will DESTROY a stock 5.0.
That'* a very bold, blanket statement to make...lol.
Unless you are referring to a large, heavy Ford car with a 5.0, you are misinformed my friend. A "stock" 5.0 Mustang with nothing but a different set of rear gears will easily run 13'* on regular old radials. I've done it myself in a few different cars. A stock 5.0 Mustang as is, will go low to mid 14'*. The "stock" L67 of the thread poster has a different blower pulley and a cold air setup and barely dips into the 14'*...The only 5.0 car he or anyone else here (that close to stock) would be able to "DESTROY", is one that is 100% stock, with a lame automatic, poor gearing, and in a heavy bodied vehicle, like he described...an OLD Thunderbird...FWIW, I went 14.72 in my old 176,000 mile Lincoln LSC with a 5.0 engine and nothing but basic tuning, a K&N, and a set of better flowing mufflers...
Our Pontiacs are nice running cars, and I love mine, but don't get too caught up in the fantasy that they are unbeatable....
Here'* my old purple "5.0", with about $3000 worth of engine mods, which isn't too far fetched of what our Pontiacs cost to mod, when getting serious...
I also noticed someone above said that the higher ratio rocker arms add duration. That is false. Higher ratio rocker arms only add valve LIFT...they have no bearing on camshaft duration whatsoever.