BBF Tuning questions

[gtfiber]

Hello,

I am a newbie here. Also, a newbie to competitive drag racing. I built a 557 stroker 385 series BBF. I built the car and engine for street/strip use. For whatever reason (mostly I like the look), I put an Offy dual quad setup with dual 660 Holley carbs that were tuned for street use. I am new at tuning such an engine. Most of what I have built in the past was mostly "mild" small blocks. So, finally, here is my predicament. I recently had the engine dynoed. It was about 40 hp less then I had hoped. It came in a 718 hp at 5700 rpm with about the same torque on pump gas. I should have tuned it while on the dyno, but time was very limited. So, I figured I would ask around for suggestions as to how to tune it to reach the 750 hp + mark, if that is possible? The car is currently tuned for street. By adjusting timing and increasing jet size would it be possible to get the extra 40 hp? Any suggestions? Thanks!

[Troy Patterson]

Hmm.

The two 660's are real small for the application at that displacement. Did you run @ WOT with a vacuum guage installed by chance?

I'd recommend two 900 or 1000 cfm 4150's for that intake. As I build them, it wouldn't be a stretch and you'd most likely have more low end / throttle response on top of it, or well, in this case, below.

The right a/f ratio is the only calibration you should ever run. 50 cc accelerator pumps on 4150's is generally a bandage for poorly engineered carbs and / or poor calibrations.

Troy Patterson TMPCarbs.net TMP Carbs

[luv737superpro]

what was your A/F ratio on the dyno??? What was your timign set at? Do the carbs have chokes on them??? Your valves?? Do you have dyno sheets you can post on here for us to look at and see where youc an pick it up??? Can you give an idea of the internals also?? If your not too concerned about mileage i would put at least dual 750's on there if not somthin slightly bigger or ever just some modifed 750's.