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02-22-2017, 03:22 PM | #26 |
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Re: Why all the hype about horse power and torque?
Yeah, and if you read my post (#3), that's what I told him and I even gave him a part/casting number for it. Then people chimed in with the theory that they don't need to run well because they're old. It's up there.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
02-22-2017, 10:11 PM | #27 |
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Re: Why all the hype about horse power and torque?
Wow! What a response! 1st off, THANK YOU all for your input, I wasn't expecting a wealth of information like this.
What I have going on was a transplant, where I removed a straight 6 three on the tree and installed a big block 396/402 from a 70 Chevelle. I did not have a carburetor when the engine was built, so I bought a Holley 0-3310S 750CFM 4bbl Carburetor brand new. It ran like crap, so I sent the carburetor to a NASCAR guy to tune and dyno for me. What I got back was way over the top, though I paid him the $400.00 and happily brought the carburetor home and mounted it to the intake. I do not plan on drag racing and I have yet to run the modified carb, but I think this is way, way too much carburetor for my needs. I am thinking the ROCHESTER QUADRAJET 7040206 is more in line with my plans and I will put my new Williams Built Holley in a glass case to be viewed by my buddies..... Last edited by 396C-10; 02-22-2017 at 10:20 PM. |
02-22-2017, 10:18 PM | #28 |
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Re: Why all the hype about horse power and torque?
It looks great, and I am sure it will be great for the 1/4 mile, but I'm not planning on racing it... I will test it out to see how it runs, but I still think this is way too much carb.
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02-22-2017, 10:24 PM | #29 | |
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Re: Why all the hype about horse power and torque?
Quote:
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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02-22-2017, 10:33 PM | #30 | |
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Re: Why all the hype about horse power and torque?
Quote:
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02-22-2017, 11:38 PM | #31 | |
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Re: Why all the hype about horse power and torque?
Quote:
Don't matter what you run for a carb, your intake choice and likely a lack of timing will make it run like crap. JMHO. |
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02-22-2017, 11:41 PM | #32 |
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Re: Why all the hype about horse power and torque?
The mechanic is an old gent, but he's somewhat a hustler. To think I got a new carb. when all I needed was a (*^()^ electronic choke for a legit Rochester. I won't use that guy again, except.........
His shop is SPOTLESS and I know one of the mechanics. About 100 years experience between the two. They work on top restorations all the time, and have a board to hover over engine bays. It's a VERY cool cart. At any rate, once this project is ready to fire, the first key will be in his shop.
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
02-22-2017, 11:50 PM | #33 | |
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Re: Why all the hype about horse power and torque?
Quote:
The correct model is 4MV 1971 402: 7041209 1972 402: 7042206
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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02-23-2017, 07:50 AM | #34 | |
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Re: Why all the hype about horse power and torque?
Quote:
Last edited by James the III; 02-23-2017 at 08:01 AM. |
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02-23-2017, 08:00 AM | #35 | |
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Re: Why all the hype about horse power and torque?
Quote:
the time it take him to rebuild it, and it still have a vacuum leak at the throttle shaft that he didn't fix would make a customer mad.. bonus is the part mark up on the new 300.00 carb.. the shop got for 30 minutes of work.. In and out and most customers will not care as long as it stars and runs correctly.. If he is an older guy he also had had to deal with the plugs in the base leaking and having to fix, and all the other issues that would take time to fix before he sent it out the door with his name on the work.. better for him to pop on a new carb and call it good.. Same reason shops don't rebuild starters,alt,water pumps, ect they make more just replacing them.. |
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02-23-2017, 10:09 AM | #36 |
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Re: Why all the hype about horse power and torque?
This is almost as good what brand of oil is best. When it comes to horsepower and torque measurements, one is no good without the other. |
02-23-2017, 12:00 PM | #37 |
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Re: Why all the hype about horse power and torque?
WOW! thats a far cry from a big block sewing machine that was posted in your 1st thread..
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02-23-2017, 12:55 PM | #38 |
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Re: Why all the hype about horse power and torque?
This thread was sure not what I expected when I read the title "Why all the hype about horsepower and torque." Lots of good information on carbs here, but some guys really do want a vehicle that has lots and lots of acceleration, and they are prepared to live with hard starting, lumpy idle, etc. etc. etc.
My 350 on the 69 has the stock Q-Jet, and despite the potential in the design of that carb (small primaries), the truck gets really lousy gas mileage. I don't think anybody cared back in the 60s. So, for the OP, getting the factory stock, smooth idling, easy starting, sewing machine carb might mean poor mileage, when it doesn't have to be that way. Things have improved since the 60s.
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02-23-2017, 04:24 PM | #39 | |
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Re: Why all the hype about horse power and torque?
Quote:
but today you can build a mild mannered just as powerful turbo'd v8 that is smooth but goes like stink.. Asking a carb designed for mileage to work on a hipo v8 and still do that without getting into it.. is well.. um.. not going to happen.. the q-jet unlike the holley you can't just unscrew and change air bleeds, etc. it takes knowing what it needs/wants and getting it right the 1st time.. Many don't have that skill.. but everyone at any show thinks they do with a holley.. key word think.. The best thing to come along is the a/f meter and data logging.. so you can see what it's doing and adjust it with data to back up it, not just a guess.. |
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02-23-2017, 11:27 PM | #40 |
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Re: Why all the hype about horse power and torque?
It is possible to set up the Q-Jet to get good mileage if you set it up to keep from opening the secondaries till you need 'em. To many q-Jets go down the road with the secondaries partly open.
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02-24-2017, 01:35 PM | #41 |
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Re: Why all the hype about horse power and torque?
I would agree
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A husband can be right...or...A husband can be happy. 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! |
02-24-2017, 02:00 PM | #42 | |
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Re: Why all the hype about horse power and torque?
Does this sound like someone concerned with cold start driveability:
Quote:
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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02-24-2017, 11:19 PM | #43 |
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Re: Why all the hype about horse power and torque?
The writing on the wall on that carb was "had a Nascar guy build my carb". If all you did was drive wide open down the interstate I'd say he's your man for a carb tweak. But that ain't reality. The key is what you need through the range.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
02-25-2017, 09:32 AM | #44 | |
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Re: Why all the hype about horse power and torque?
Quote:
but their rpm range is much higher than any thing on the street.. |
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02-25-2017, 09:50 AM | #45 |
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Re: Why all the hype about horse power and torque?
They don't stop or shift much
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
02-25-2017, 12:22 PM | #46 | |
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Re: Why all the hype about horse power and torque?
Quote:
But it might not transfer to carbs, as you say, because they're basically wide open all the time! You know who you really want? That unnamed grey-bearded old tech who worked at the corner Texaco for 40 years. That dude can fix anything. But avoid his brother, he's terrible. Unfortunately they look identical...
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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02-25-2017, 03:50 PM | #47 |
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Re: Why all the hype about horse power and torque?
If a guy can tune a carb for each track and it's gearing and rpm and shifting..
He can tune a street carb.. but you have to be honest on what it's going on and it's use.. most fib. here and with cams, and converters then wonder why it's ruff, coughing mess.. that is junk till 3000 rpm than it's like you hit a light switch.. |
02-26-2017, 01:38 AM | #48 |
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Re: Why all the hype about horse power and torque?
That aint no sewing machine! Thats a 396 Big Block Chevy motor. You make snide remarks about horsepower and torque and then go buy a Holly? Quit messin around and put a Quadrajet on that Chevy motor! Leave the Camrey's (whatever that is) and the sewing machines to grandma. Dont you have a spreadbore intake? NO other 4bbl carb will get the mileage a Quadrajet can get. And consequently no other carb has 2-1/4" secondaries to make your sewing machine set your hair on fire! Learn your carb, welcome to the performance world...~Ghostrider~
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American" |
02-26-2017, 02:55 AM | #49 |
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Re: Why all the hype about horse power and torque?
FWIW...
I am running a 7043207 on my basically stock 73 C/20 454, .060 over, low cast iron intake, small valve non ported 049 heads, & Thorley Tri-Y's. This Quadrajet was a simple recolor & rebuild. Doing some detailed assembly and THOROUGHLY inspecting everything, done right, it works just fine. My only issue is that I need to change the needles as it runs just a little bit to rich. Otherwise, no complaints
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02-26-2017, 12:21 PM | #50 |
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Re: Why all the hype about horse power and torque?
As to answer the OP's question. It's all about marketing and selling stuff. The factory did their work to make people like you happy. What are your expectations for fuel mileage? The BBC is notorious for poor fuel mileage.
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