Need a bigger Holley main body upgrade for a old 950.

[NXBOY]

Heard the proform 950 was a bit bigger in the Venturi but the one I had in past had core shift in bores. Heard the holley true 950 is a poor design. Need to find one that is about 50 cfm bigger then the old 950 cfm, They flow around 830-840 wet CFM. I have a milled ported 9380 will this flow more?? Plate has stainless blades and thinned shafts and butten head screws. Leaving off transbreak with 521 cubes-800ish HP 1/8mile street strip.., Thanks

[Walter R. Malik]

Heard the proform 950 was a bit bigger in the Venturi but the one I had in past had core shift in bores. Heard the holley true 950 is a poor design. Need to find one that is about 50 cfm bigger then the old 950 cfm, They flow around 830-840 wet CFM. I have a milled ported 9380 will this flow more?? Plate has stainless blades and thinned shafts and butten head screws. Leaving off transbreak with 521 cubes-800ish HP 1/8mile street strip.., Thanks

Call BLP as they will CNC a main body venturi to almost any shape you want.

[PRH]

The early zinc Proform bodies I used did indeed have some pretty noticeable core shift in the venturi area.

The recent aluminum QFT bodies I’ve seen more recently seem to be fine in that area.

[BradH]

Just a "brain dump" of my OPINIONS based on the OP's info:
- 500+ cubes and that much HP needs a 4500 (Dominator) carb
- Cheapest proof-of-concept with a main body swap is probably getting a Holley 134-302SA aluminum 850 HP main body (1.56" venturi w/ down leg boosters) for about $150
- QFT/Proform main bodies are good enough now that a number of carb builders use them; even Braswell offers an "economy" (all things being relative) option for 4150s that use them
- The current carb w/ a "bigger" new main body may also need additional mods such as bigger angle channels in the metering blocks, etc.; if you're not an experienced carb tuner, be prepared that it could be more than a simple main body swap to get it dialed in
- My first thought was the same as Mr. Malik's, i.e. get a BLP BX4 main body sized & boostered (is that even a word?) based on their recommendation; their main bodies w/ down leg boosters start at about $300, but that doesn't account for any additional changes required as noted previously

Carry on...

[NXBOY]

I'm not a expert but i don't mind fine tuning passages and such. Done did all I can to the throttle plate , thin blades and button screws on thinned shafts. I will be using a set of quick fuel blocks. got three emulsion ones and I think four and five, but always take some out in the 4 and 5s emus. I have a freind that has like a 1000 or 1050 Quick fuel shiny old one I think with red anullars. How is this carb? I'll look into that aluminum 850 also, Thanks

[BradH]

I'd suggest you join this forum and post this stuff on there, too. Lots of smart carb people on there (I don't consider myself in that group) who can provide feedback & guidance: http://racingfuelsystems.com/viewforum.php?f=5

All I can tell you about the QFT 1050-AN main body is that I built a nice carb around one, but wasn't sure I got it really dialed in before selling it cuz I simply had too many on hand.