WisT02ws6

Had my car on a Mustang Dyno just to see where it was at (bought it in March). Mods are:

1973 454 BBC from a truck (3999289 casting) I think its MAYBE 8.0:1 compression
Holley 800 double pumper with mechanical secondaries (spreadbore)
Holley low-rise Street Dominator intake manifold
Unknown hydraulic flat tappet cam (has a decent lope at idle at least..)
049 heads with roller rockers and dual springs
Electric fan
Long tube headers (1-7/8 I believe)
Stalled (unknown size) TH350
12 Bolt rear with 3.73 gears

The first pull (Red) was from 1900-4500 just to make sure the AFR was good and to see what the stall looked like.
Second pull (Green) was from 3500-5500



Seems that it doesn't really make any more power over 3500RPM. Any input on what might be causing that? Cam or intake combo maybe?

WisT02ws6

I'm thinking about switching to a Holley Street Dominator single plane intake. Will this help shift the powerband up?

SoFla01SSLookinstok

Just with the info on the combo it could be several things. The compression seems pretty low. Unknown cam specs. My dads hot rod lopes pretty nice with .4xx" valve lift. As you said also the intake manifold/carb. setup . I hate combos with unknown specs. Playing with a can of worms lol. What is the use of this motor. Race/performance? Just my opinions/thoughts as I'm not really a BBC expert. Good luck man.

WisT02ws6

Yea I know that not having the cam speca really makes this a guessing game. I don't want to tear the car apart this year, so its going to be a mystery. I plan on using the car for weekend street fun and track time. Might drive it to work once or twice a month if its nice.