When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
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?
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.
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.
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.
7 Most Reliable High-Performance Engines GM Has Ever Built
Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.
Interesting Dyno Results - BBC 
