Holley 350 rebuild for ~150hp

[wsa111]

Ken, the emulsion bleeds should be .028". One at the top & the other bleed 1 up from the bottom. The bottom should be a blank as well as the second one down from the top.

Your idle orifice should be close to .030". The restriction under the power valve is a guess at .045-.050'

The main jetting will have to be determined with a wideband at cruising speed as well as the pvcr.

I never tested this combo cause the 350 alone starves the engine.

Your other concern is the fuel bleed, if your A/F hooks rich at the top end it will have to be enlarged .002-.004" to lean out the top end.

These #'s are close to what you need cause i never have tested the small annular nozzles on the 7448-350 carb.

The large annular nozzles are for the 4412-500 carb with the venturi enlarged .060" to compensate for the more restrictive nozzle.

On your 350 carb, thinning the throttle shaft will pick up 20 cfm of flow for you. Bill

 

[MPGmustang]

pulled it apart today, this is what I got:

jets: 61H
cam: orange #2 hole (~24cc)
squiter: 31
Power valve: reads 4 8 5 (so don't know if it's a 4.8 with month 5 or a month 4 with 8.5)

New
Jets:58
Cam: orange #1 hole (~19.5cc)
Squirter: 28
Power valve: 6.5

I would like the newer billet metering block and the annular boosters, but not going there yet...

any idea on what cam I should go to? but cleaning it today, then testing it tonight. might have to change timing but hope to pick up a few ponies... hopefully break the 140 barrier...

Edit: I've found the info at lopers on the cam, I know my 24cc was a bit much and the fact that it was always engaged. I have backed off the to about 1/8 inch and now gives the proper squirt, but I have hesitation on easy take off, have to give it more gas, maybe I should put the cam back on #2?