http://www.hotrod.com/techarticles/...gine_shootout/ford_boss_302_chevy_dz_302.html
Year: 1969
Ford Boss 302 Vs. Chevy DZ 302
The history of the Trans-Am series is well documented. Unfortunately, the actual performance, or at least the real power output, of Chevy's and Ford's sub-5.0L street motors is somewhat less so. It seems that every article ever written about either the Boss 302 or the DZ 302 always mentions the same thing: Though originally rated at 290 hp, these 302s made as much as 400 hp. Checking out the spec box, we see that the DZ 302 was essentially a 302ci version of the 365hp 327, sharing the 11.0:1 compression, Fuelie heads, and even the Duntov 30-30 cam. Also present were the aluminum high-rise intake and Holley 780-cfm carb. As impressive as the specs were on the Chevy 302, Ford's Boss 302 stepped up things with a pair of production four-barrel Cleveland cylinder heads that flowed as well as a fully ported set of Chevy race heads of the period. Compared with the Chevy, the Boss 302 was down slightly in compression (10.5:1 versus 11.0:1) and down in cam duration at 0.050 (228 degrees versus 254 degrees) but up in valve lift (0.514 versus 0.485). Both shared impressive induction systems, but the Boss 302 heads allowed it to not only overcome the deficit in compression and cam timing but also actually outperform the Chevy 302.
Year: 1969
Ford Boss 302 Vs. Chevy DZ 302
The history of the Trans-Am series is well documented. Unfortunately, the actual performance, or at least the real power output, of Chevy's and Ford's sub-5.0L street motors is somewhat less so. It seems that every article ever written about either the Boss 302 or the DZ 302 always mentions the same thing: Though originally rated at 290 hp, these 302s made as much as 400 hp. Checking out the spec box, we see that the DZ 302 was essentially a 302ci version of the 365hp 327, sharing the 11.0:1 compression, Fuelie heads, and even the Duntov 30-30 cam. Also present were the aluminum high-rise intake and Holley 780-cfm carb. As impressive as the specs were on the Chevy 302, Ford's Boss 302 stepped up things with a pair of production four-barrel Cleveland cylinder heads that flowed as well as a fully ported set of Chevy race heads of the period. Compared with the Chevy, the Boss 302 was down slightly in compression (10.5:1 versus 11.0:1) and down in cam duration at 0.050 (228 degrees versus 254 degrees) but up in valve lift (0.514 versus 0.485). Both shared impressive induction systems, but the Boss 302 heads allowed it to not only overcome the deficit in compression and cam timing but also actually outperform the Chevy 302.
