Carburator and Intake manifold CFM question
#1
Carburator and Intake manifold CFM question
I'm running the stock intake manifold and stock quadrajet carb on my big block 402. The cam that is in the engine has a basic operating range of 1200-4500 rpm and was made by summit (if that matters). That's all the parts that have been upgraded so far. I'm looking to upgrade the carb and intake manifold but I don't know what cfm to go with. Any help with that or recommendations for carbs/intake manifolds would be great. The engine is a 1972 402 that came out of a chevy caprice.
#2
Do you have headers? I'd consider a good exhaust system a must have first.
You'll get a lot of opinions on different intakes and carbs.
More input on how you plan on using the car would help since there are a lot of different set ups out there,some better suited for racing and some better for daily drivers and some that compromise and work well as a street or strip set up.
Personally on a big block I like a single plane intake like an Edlebrock torquer and a good sized Holley double pumper carb 750 or bigger cfm but then I like to mash the peddle a lot too.
If you like good street manners better you might prefer a dual plane intake like an Edlebrock performer and a 780cfm Holley vacuum secondary carb or a reworked Q-jet maybe.
You'll get a lot of opinions on different intakes and carbs.
More input on how you plan on using the car would help since there are a lot of different set ups out there,some better suited for racing and some better for daily drivers and some that compromise and work well as a street or strip set up.
Personally on a big block I like a single plane intake like an Edlebrock torquer and a good sized Holley double pumper carb 750 or bigger cfm but then I like to mash the peddle a lot too.
If you like good street manners better you might prefer a dual plane intake like an Edlebrock performer and a 780cfm Holley vacuum secondary carb or a reworked Q-jet maybe.
#3
I don't have headers installed. I'm thinking about doing it, but I don't want to have to modify the fender wells and stuff. Eventually I'm gonna throw aluminum heads on the block, so right now I just want to upgrade my carb and intake to get more power. I'm thinking of a dual plane intake because I don't have a lot of hood clearance for a tall single plane intake. I want to be cranking out more hp. Right now I'm at about 260-280 at the wheel. The engine came out of a chevy caprice, so it's got the big block but not much power. I'm new at mechanics, so if my ideas are going the wrong way, just bare with me please.
#4
No need to mod the car for headers,big block headers are readily available for your car.
You'll waste your money putting on a bigger carb and intake on without doing the exhaust first,it's gotta breath or it'll fail to do much other than eat more gas with a bigger carb and stock exhaust.
You'll waste your money putting on a bigger carb and intake on without doing the exhaust first,it's gotta breath or it'll fail to do much other than eat more gas with a bigger carb and stock exhaust.
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