600 vs 750 carb

1979bruiser · 10-15-2006, 07:13 PM

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.

Unit 5302 · 10-15-2006, 07:48 PM

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.

Jeff Chambers · 10-16-2006, 07:01 AM

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.

PKRWUD · 10-17-2006, 03:07 PM

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.

~The Jester~ · 10-18-2006, 07:12 AM

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!

bmxmon · 10-19-2006, 02:10 AM

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.

Unit 5302 · 10-19-2006, 06:34 PM

Quote:

Originally Posted by ~The Jester~

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!

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.

Dark_5.0 · 10-19-2006, 10:12 PM

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.

1979bruiser · 10-20-2006, 03:54 PM

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.

Rev · 10-25-2006, 07:41 PM

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

1979bruiser · 10-29-2006, 08:03 AM

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?

10-15-2006, 07:13 PM	#1
1979bruiser Registered Member Join Date: Aug 2006 Location: budds creek md Posts: 100	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.

10-15-2006, 07:48 PM	#2
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	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.

10-16-2006, 07:01 AM	#3
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	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. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

10-17-2006, 03:07 PM	#4
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	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. __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

10-18-2006, 07:12 AM	#5
~The Jester~ Rat Killer Join Date: Aug 2002 Location: Cold ass Ohio Posts: 1,143	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! __________________ d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply.....

10-19-2006, 02:10 AM	#6
bmxmon Registered Member Join Date: Mar 2004 Location: Minnesota Posts: 950	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. __________________ Alex

10-19-2006, 10:12 PM	#8
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	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. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

10-20-2006, 03:54 PM	#9
1979bruiser Registered Member Join Date: Aug 2006 Location: budds creek md Posts: 100	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.

10-25-2006, 07:41 PM	#10
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	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 __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe

10-29-2006, 08:03 AM	#11
1979bruiser Registered Member Join Date: Aug 2006 Location: budds creek md Posts: 100	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?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Should I Run a Carb or EFI Setup? Please Help	BlackFireN2O	Windsor Power	1	08-07-2002 03:16 PM
to carb, or not to carb...this is my question.	black86notch	Windsor Power	4	08-06-2002 08:24 PM
Carb Woahs	RoadWarrior	Classic Mustangs	4	07-27-2002 11:06 AM
efi to carb. /?	WADS56	Windsor Power	0	09-26-2001 12:45 AM
new carb..but how much cfm??	69PonyRider	Classic Mustangs	4	09-13-2001 07:59 AM