Originally Posted by AndersonRacing44
Ive been steadly modifing my 72 firebird. from the auto turbo 350 trans to a 4-speed muncie.
since its the weak 180hp 350 with the 2 bbl rochester and 7.6 compression ratio, ive found a few parts.
-an edelbrock preformer manafold
-600 holley even bore carb
-and a set of heads off of a 400. the head is 87cc
-and a set of long tube headers.
How much should i gain torque and hp wise with these? i was thinking 50 from the 4bbl and another 70 from the compression ratio increase.
The '74 350, with a 4bbl, #46 heads (86cc, 7.6:1 comp), and an 066 cam made 200 net hp. The 066 cam has 273/282 duration and .406 lift, compared to your 555 cam with 269/277 duration and .374/.406 lift. You cant just add X amount of hp for this, and Y amount for that. Everything has to match everything else.