I've got a 350 engine. I'm wanting to put vortec heads with a .480 lift cam in it and a holley carb. I was thinking about a 750 cfm vacuum secondary carb, but I think that might be too big.
2007-01-30 11:44:03 · 6 answers · asked by Polamalu is God 5 in Cars & Transportation ➔ Maintenance & Repairs
it is to big,i own a repair shop,and right now I'm building a Chevy suburban,and a good edelbrock 650 will be plenty of gas for it,that's about the same set up i got ,and even a 600 will run it good,actually a 600 is the ideal set up for it,they wont run too rich at idle,a 650 will,i may switch and go down to a 600 because they do run a lot smoother with them that an 650,id run an edelbrock on it ,a Holley is a good carb but they like to flood out a lot,edelbrock usually give real good performance,good luck with it,i hope this help,s.
2007-01-30 11:56:42 · answer #1 · answered by dodge man 7 · 0⤊ 0⤋
I learned that you should come pretty close to matching the displacement to the carb size. For example, a Holley 390 cfm would be about right, maybe a bit small for full-on power, but you could probably go with a 485 or even a 600 if you need it. 750 sounds too big.
2007-01-30 11:53:54 · answer #2 · answered by Me again 6 · 0⤊ 0⤋
Don't get any larger than a 600 CFM, first....Second, don't get a Holley. Holley carbs are junk, too much rubber. They used to be OK, but they strayed from the Weber design in the late 70's. Order an Edelbrock and put it on a cast iron intake as aluminum intakes like to crack on cast iron blocks. The only rubber part in a Weber is on the needle. The power valve is metallic and you never have problems with them. Good luck.
2007-01-30 12:30:11 · answer #3 · answered by jeff s 5 · 0⤊ 0⤋
The general rule is twice your cubic inches at 6000 RPM, if you're not going to be operating in that range a 600 or 650 will do just fine.
Vacuum secondaries work well with automatic transmissions, I prefer the Carter type carbs. but they are harder to tune out do to more scarce parts, tuning parts for Holley's are everywhere.
2007-01-31 03:06:52 · answer #4 · answered by Anonymous · 0⤊ 0⤋
750 is too big. (low velocity through the venturies)
I'd go with a 650.
2007-01-30 11:50:47 · answer #5 · answered by Mr. KnowItAll 7 · 0⤊ 0⤋
put one that use electric fuel pump,other wise the gas supply will be work-less.
specified on electric fuel pump manege-able carb
2007-01-30 11:52:24 · answer #6 · answered by Anonymous · 0⤊ 0⤋