600 vs 750 carb
 

i have a neighbor that tells me that in a ols hot rod magazine they dyno tested 2 carbs on 3 different motors( chevy ford and mopar)(so he says) and tells me that the artical was called over carburating??? any ways acording to him they all had identical set ups_cam ,intake ,headers ,and heads.they 600 made more hp than the 750.does anyone esle recall this artical or think this is true? all motors were 350-351-360 cid.

Re: 600 vs 750 carb
 

I don't know about the article, but it wouldn't surprise me a bit so long as the engines weren't heavily modified. Bigger is not always better, and a 600cfm carb setup is more than enough for most smallblocks.

Re: 600 vs 750 carb
 

Oh how true. Just for a point of comparison, my Warrior motor is 315ci with a 263/281 solid roller cam spinning to more than 9000 on the shifts. I use a 650cfm Holley 4150hp carb.

Re: 600 vs 750 carb
 

Agreed. A big carb is usually used to hide mistakes made when matching engine components during the build. A well built engine is often more powerful with a smaller carb.

Re: 600 vs 750 carb
 

Put me on the "agree" list as well!

Horsepower TV just installed an engine dyno, and tried MANY different combinations on the same engine, even if it was a "brand X" small block.

Bigger is NOT always better. They actually lost power with a bigger carb. Lost power with a set of HUGE tube headers.

Honestly it was one of their better shows I've seen! ;)

Re: 600 vs 750 carb
 

I reccommend you go buy the book Holley; Carburetors, manifolds and Fuel Injection. A good book with lots of useful information. I got mine used (looks brand new though) through amazon.com for like $5, $9 total including shipping. Well worth it.

Re: 600 vs 750 carb
 

Are you sure it wasn't just that "Brand X" smallblock engine wearing out getting ready for it's next overhaul? You know they only go for 4 dyno pulls before the valve seals are shot and the piston slap kicks in.

Re: 600 vs 750 carb
 

I am sure yall are correct about over carbing an engine. I never see anything smaller than a 750 on the carbed 302's at the track. I tell them that sure is alot of carb for a 14 second car.

They all say the same thing every damn time.

"You cant have too big of a carb, the engine only takes in as much air as it needs."

With all of the carb questions I have seen lately it makes me glad i stayed fuel injection.

Re: 600 vs 750 carb
 

thats cool that everyone has the same basic thing to say. so w/ that i will be looking for a 650dp this weekend at the fun ford classic.

Re: 600 vs 750 carb
 

I think it was Harvey Crane who once said that "It always seems like the owner wants a bigger cam and carb than the engine does", LOL.

Rev

Re: 600 vs 750 carb
 

now too big of a header will lose power also- learned that years ago first hand- the onlything i could find for a 351 is 1 3/4. i should be ok w/ that.
the rest of my set up is a
extreme comp cam xe284h
performer rpm air gap
1.6 roller rockers
keith black flat top w/ 2 valve releifs
pro comp 190cc aluminum heads
bbk 1 3/4 long tube headers
350 dp holley or maybe a demon if i find a deal.
anything anyone would change?