Might need some rejetting to make the 4 hole work good. My 4 hole on my old 440 with the single plane SD worked good at low speeds for my combo. Ron

Ron..or anyone who has done this....any idea on which way to go?...up or down? Right now the 950HP is jetted 76/86. THANKS in advance!

Randy, try adjusting just the shooters before messing with jets (I personally like to tune jets by the plugs). My engine had a bad stumble with my new Holley and I was able to tune it out by messing with the shooter size. If you don't have them already, install the hollow shooter screws. Installing them eliminates the possibility of flow being an issue.

Thanks,Ryan! I was thinking of going to a 37 squirter,before messing with the jetting. Sorry I didn't get back to you last night! By the time we got out of Paisano's...it was after 8! That place was packed! Their pizza is TOP NOTCH,though! The waitress didn't even charge us for our pasta fajole'...our pepsi's..and gave us free canole to take home! Well worth the wait!..about 15-20 minutes!

I would just take all the carbs, and all the spacers, haul it all down to Jakes, strap it down, plug in the O2 sensor and let it rip.

Let the best combo win. Done.

That way you'll know if A/F is in the ballpark with the best carb and spacer combo too, so there won't be any need to mess with changing jets at the track anymore unless the temp takes a fairly big swing.

When you get to the track prepare to change squirters, probably go larger but not always. I got tired of changing them and bought a drill set...

I have a 4 hole on now, because I can't bolt my carb down flat to the intake, and I lent out my open spacer....
It makes my 60' performance terrible, then start chasing gremlins,,,
It just needs to come back off.