Originally Posted By: psy4s
Originally Posted By: ProStreetCamaro
That carb is to small.
With that said I would break it in on Rotella and then switch to rotella 5W-40 syn or amsoil ACD.
http://www.amsoil.com/a/Synthetic-Diesel-Motor-Oil-Engine-Oil
BTW welcome to the 383 stroker club! Mine is a bit wilder than yours but then again mine was built for all out drag racing.
I contacted Holley Carbs, Super Street Carbs, and Demon Carbs. They all told me to run a 650cfm carb, and nothing larger. I went with the 750 AV has reduced flow from a 750 due to the Annular Ventury in the passage, but it is supposed to atomize the fuel better with better low end responce. It has reduced air flow at low RPM's but at WOT it is supposed to flow more than the 650. Since I am going to drive it on the street, I compromised. Of course, I can easily swap it out for the track. It wouldn't be a problem to keep a larger carb just for track day.
Best of both worlds. I Hope.
I agree completely and have time slips to prove it. By looking through the old Holley books, or even online you'll see a simple chart and formula that asks for rpm range and cubic inches, then it spits out a carb cfm rating. I run two Pontiac 400's both peak 5800 rpm. 99% of the couch racers at the track tell me it needs at least 800 cfm. I ran a 750 for 6 months, tried every jet combination and ignition setup I could think of, graphed all my changes, saved and compared all the time slips and had a best of 12.9 @ 105 mph, it just wouldn't go faster, and the 60 foot times were horrible. I decided to use the "Correct" carb which is a 650, and immediately dropped to 12.30's. After some jetting we now have 12. 1 to 12.2 consistently....60 ft times are 3/10 faster, and top end increased to 108. Wanting to go fast and actually going fast are two different things, and just slapping a bigger carb is not the way to do it.