Is a Holley 750 DP too much carb?

[justinp61]

The 750 isn't to big, the tune is off for the op's engine.

 

[justinp61]

No worries I got ya

350 Chev is a terrible performance engine. Look at any similar build ups between 318/340/360 to a 350 the mopars always seem to make 50 plus hp more than the 350. Thats until the aftermarket started making great heads for them.

The 350 isn't a good performance engine? There must be some terrible tuners in your part of the world. There have been some very stout iron headed 350's around here.

 

[318willrun]

We looked at the carb today and my friend agreed that the 750 is too big for this motor. jets in it are 72 and 80. Pouring fuel in. I just ordered a new Holley 650 double pumper and gasket set. He's gonna help me set it up and dial it in. Also on your recommendation we are gonna change the timing. He's been racing for years and definitely know what he's doing. I'll let ya know how it shakes out. Later.

Nice Car! If your carb was "pouring" in the fuel, then you had an issue with your carb. Carbs do not "pour" fuel in, only the accel pumps give the initial hit, then the engine "draws it in". Your buddy that "definitely knows what he's doing because he's been racing for years" should have known this. If he is going to help you set up the 650, he should have set up the 750. I have a 770 on an almost stock 318. Oh, well, the 650 Holley will run it fine.
P.S. - I'd keep an eye on the buddy ;)

 

[273]

The 350 isn't a good performance engine? There must be some terrible tuners in your part of the world. There have been some very stout iron headed 350's around here.

Obviously there's a lot of fast 350 out there I'm just saying it takes more effort and parts (lucky there cheap) to get power out of one.
Im just saying it was a poor design from a performance point of view.

Look at canadian nascar they were still 350 vs 360 and mopar domainated i think there starting to move away from stock based engines haven't paid attention in a while.

 

[AJ/FormS]

I put a big TQ, you know; the 440 sized primaries,lol, on a stock long-block LC 73 teener. It was on there for at least 7 years,probably longer. Chrysler rated those as 850s IIRC. I didn't actually put it on there for it's amazing power making ability,lol, but rather for the tremendous pleasure I get listening to those secondaries howl. I put 2.76s back there for a time,just to make that teener howl near to forever. Put it into first gear and slam the go-pedal down; and here it comes ..... moooHAN, all the way to 50/55.I loved that!
It wouldn't moan on my 367,cuz when I nailed it,everything went up in tirespin, and dual 3 inchers kindof supersede intake howl.
The 340s are only 21 cubes bigger (6.6%) than teeners and they put 6-bbls on those, which were rated at over 1000cfm;13something IIRC
Wasn't there a 289 6bbl once,back in the early 60s?
Point is; it ain't too big until it's too big. And you'll know it when it's too big by the way the gas pedal works.
You'll find 2bbl Carbs with primary bores in the range of 1-7/16 to 1-9/16, on stock SBMs. I think there was a bigger one even than that on 360s. The 750Holley has 1.75s which is just 12% bigger than the typical 1-9/16ers on teeners.No biggie. Time the secondaries right, or cover the transition with a big fat pump-shot and away you go. Does a teener need a 750? No!,but if it's already on there, I would do my best to make it go!

 

[RPMagoo]

I was told, by an Old Hot Rodder, That as a general rule -- 2 X cubic inches is a good starting place for Carb - CFM.

 

[AJ/FormS]

That works for all engines that rev to 6912 and pull 100% VE at that rpm.........according to the formula

 

[273]

Too me it's more about your engines hp than engine size when picking a carb. Eg.. 400 hp needs basically the same amount of fuel and air no matter what the engine size is.
Ballpark 350 hp less 650 cfm, 400 hp or more 750 cfm and in between is a judgment call depends if it more street than strip.