750 holley carb on a 350? [Archive] - Nova Tech

: 750 holley carb on a 350?


1972nova
Dec 14th, 07, 11:25 PM
thats how i bought the car. is this ok to run? do you think i should get a 650 instead?

jays64II
Dec 15th, 07, 02:04 AM
if jetted properly it will be fine. is it a double pumper or a vac. secondary ?

1quik69
Dec 15th, 07, 02:16 AM
Should not be a problem if it is a vacuum secondary carb. Keep in mind that GM put a lot of Quadrajet carbs on their 350 engines. Most q jet carbs are in the vicinity of 750 cfm. If the car is running ok, just leave it. As they say, " If it aint broke, don't fix it".

Doug G
Dec 15th, 07, 08:26 AM
750vs would be fine IMO... hell, they put 780's on lil' 302 Z28's.

1972nova
Dec 15th, 07, 08:41 AM
well. i took it to the shop and the guy workin on it said that the 750 could be 1 of the reasons why it is smoking out of the exaust. someting about too much fuel into the engine?

Big Dave
Dec 15th, 07, 11:49 AM
It may need to be tuned. You can buy a tuning kit for your mechanic friend. But odds are if he did not know that it is time to find a new mechanic (bear in mind most mechanics have never seen a carb.; fuel injection has been the norm for the past twenty years). The booster type is the single most important criteria to look at once you exceed the calculated cfm of a motor (a 350 should not need more than about 530 cfm wide open, but a stock 350 runs best at about 670, and one with improved volumetric efficiency likes upwards of 850 cfm.). Look at the list numbers on the carb air horn. It will tell you if it has straight boosters (standard) down leg boosters (high performance) or annular boosters (the best you can buy). With annular boosters you could run an 850 vacuum secondary all day in traffic and get perfect plug readings (assumes you do not have an oxygen sensor which is how it should be tuned).

Big Dave

1972nova
Dec 15th, 07, 10:30 PM
well screw the carb. now its time for a new fuc#### engine. we found out the 1 of the cylinders was all effed up. and there is no easy fix so we are just going to buy a new crate engine. any ideas where i can pick up a good reliable performance crate engine that will increase the value of the car? somewhere in the 3-6K range?

Big Dave
Dec 16th, 07, 07:53 AM
Scogin-Dickey/Gifford sell GMPP crate engines. They will also customize them as to GM heads and cam and still honor the warranty.

Big Dave

1972nova
Dec 16th, 07, 09:17 AM
where can i find one? do they have a website?

Big Dave
Dec 16th, 07, 10:28 AM
where can i find one? do they have a website?

Yes!
Here is a brand new Vortec 350 with a 36 month warranty. It will need a Vortec intake and use the rest of the parts off of your old engine. Add a Hot ZZ4 cam and enjoy your ride.

http://www.sdparts.com/product/12530282/199602ChevroletGMCCKGL31.aspx

http://www.sdparts.com/product/E21162/IntakeManifoldPerformerVortecSBChevy262400cid4bblP ermastarfinish.aspx

Big Dave

1quik69
Dec 17th, 07, 01:50 AM
www.scoggindickey.com

1972nova
Dec 17th, 07, 04:58 PM
www.scoggindickey.com (http://www.scoggindickey.com)


WTF do you want me to do there?

1972nova
Dec 17th, 07, 04:59 PM
i think im gonna buy the zz4 from GM

1quik69
Dec 18th, 07, 01:05 AM
WTF do you want me to do there?


Well if you had looked there is a place to click for parts. It will take you right to the performance section which lists all their crate engines etc. Maybe you should try a little harder instead of copping an attitude and shooting your mouth off with foul language. We're all just trying to help you.

1972nova
Dec 18th, 07, 05:21 PM
Well if you had looked there is a place to click for parts. It will take you right to the performance section which lists all their crate engines etc. Maybe you should try a little harder instead of copping an attitude and shooting your mouth off with foul language. We're all just trying to help you.

im sorry im just ****ed that i have to buy a new engine. i got robbed buying the car and the previous owner is only giving 700 dollars back.

jim454
Dec 24th, 07, 02:29 PM
The 290 H.P. G.M. crate engine is a good engine for the price . Around 2400.00 or so .It comes complete with carb,intake,dist.,valve covers,kit that you install on the long block.Jegs,Summit.In my opinion the 750 Holley is too big for a smallblock.Unless you are spinning 7500 R.P.M.'s at the track.A 600 is a better choice. 350 C.I.D.X 6000 R.P.M.'s = 2100000 divide by 3456=608 C.F.M.'s X .85 which is the Volumetric Efficiency of a high performance engine=516 c.f.m.'s . A 750 is just too big. Have a great x-mas everyone:beers:

1972nova
Jan 1st, 08, 06:38 PM
how does the LS1 or LS2 sound?? i know it is faster and gets better mileage right? costs a little more but i would get a used one

jays64II
Jan 2nd, 08, 07:10 PM
mileage is better if fuel injected only and just the conversionb to fuel injection and everything else you would need to swap to an LS based motor will double the cost of buying the motor alone.