The sound of that engine makes me miss my 1970 Buick Electra 225 they had the 370 horse 455 with 510 ft-lb torque... It was nicknamed the silver bullet because of its color
That's the exact car year and model this engine came from. It's been heavily modified over the years. It was a quick scoot stock in that 1970 lead sled!
@@NoTop442 with the right highway gears(2.41 or 2.56) those cars could get decent fuel mileage and still be able to smoke the tires because of the amount of torque the 455 made. If I still had the car, I would put dual three inch exhaust with quiet flow stainless mufflers and an x-pipe.
For sure. That '70 duece and a guarter would just float down the highway at 80 mph. Would make a good sleeper. Mine was a four door. Don't recall if they had two door 225s.
I have never adjusted the APT on one of those carbs. I always got my Rochester carbs to behave without it. Now that I have an exhaust analyzer, I may look into that for a deeper dive on my carbs. I suppose there may have been some APTs froze up over the years and I'm compensating in other ways.
NoTop442, Man...you are speaking my language here, thanks for a really informative video. I have a 74 Century GS that had been built to 70 Hi compression specs, with Poston Buick Pistons, 490 lift cam, Edelbrock Spredbore intake, MSD, Headers. Edelbrock 750CFM on it now, but I did invest in an NOS Rochester Carb from a 72 GS. I was hesitating on changing because it is running pretty strong now, but IMO< the Rochester gives more full throttle wallup than the square bore Edelbrock, though the throttle response from the Edlebrock is better then the Rochester...you have to EASE your foot into the Rochester, then Yee-ha....I think I need to set up my Rochester with a light spring like you did an try it out...LOVE your car NoTOP! damn..I have lots of great memories with GS455s from the 80s til now...rock on.
Above the secondaries on the Quadrajet there's a spring loaded flapper thing similar to the Edelbrock , but it can be adjusted. I suspect yours is out of adjustment. You shouldn't have to ease into it nor finesse it. There's a happy spectrum, just adjust to your liking. Watch "How to adjust Quadrajet secondary air doors" on TH-cam th-cam.com/video/QhNYMftwNUo/w-d-xo.html Try this. 3/32 Allen + small flathead screw driver
I've got 3 - '72 Monte Carlos I only drive/own. One is a Big Block... Use points dist on them all. All stock, so nice auto. Bench seats are quite a bit more comfy than what cars have today. I really like your wheels on your car too! Always admired those wheels. Wish I could afford a house like you, then my cars would look as good as yours. But fine gentlemen trying to steal them when they look pristine, and people backing up into them, and then their personal body guy spraying clear on the repairs, which is peeling off, really sux being poor. Mobil mechanics not knowing how to do things, and I notice I am more capable than they are, and I am 67 right now. But only owned/driven 1st gen Montes since 1974.
Beautiful car! I have a 72 GS convertible. Buick's can run a ton of duration and sound real nasty at idle then they smooth right out and have a ton of torque. The most underrated muscle car ever! My 10 year old son would sneak the keys from me when I wasn't home just to hear it idle. I will admit it was the baddest sounding street car I've ever heard.
One of my buddies in the 80s (we were 19 year old pukes), bought a 70 GS convertible from another buddies neighbor. Turned out it used to be the parade car from some local douchebag politician. Anyhow, someone had installed a 800 CFM holley, and a 8 QT oil pan. It had an OPEN 3.08 (or 2.93?) but the damned thing once off the line was a goddamn bomb from Hell! We had 4 guys in this car (Keg of beer in trunk with nozzle thru seat..lol) and buried the 120 speedo by a ridiculous amount. We used to race motor cycles with that car...pissed off allot of people...(bikes were not as fast back then).
@@gt-37guy6 My dad had a Buick Wildcat and one of my friends dad was a mechanic at the Buick dealership and he dragged a stock but highly tuned GS to hi 12's. Very impressive. I bought this car from the Dupont family. I had some rust and someone dropped something on the top so it had to be straightened. I did a frame off resto. It's close to stock except for the leather seats. Motor has aluminum heads, moderate cam and manifold with headers. It's a sleeper for sure but always gets a lot of looks at car shows since there aren't many of them. Thanks for the comment. Your car is beautiful!
Having an issue maybe someone can help with rebuilt 454 with original Rochester carb rebuilt the carb and engine and has a mild cam in it now with done pistons and .30 over bore when I start it I runs and the minute you give it fuel from the throttle it stalls seems loaded up rich now however when you go and choke the carb manually after it warms up and the choke pulloff drops the idle increases almost giving me an indication of lean I’ve worked on these carbs since I was 16 an I love them but I’m not sure how to lean it out!? Everything on carb is original but gaskets and fuel mixture screws are still unmolested and not cut or replaced with adjustable jets however the carb ran decently rich before I spun a rod journal and cracked the crank that cause the rebuild any idea how to lean the engine out machine shop has everything set up for 93 octane and I’ve seen to found where it likes around 15-20 degrees initial timing just trying to dial in my total timing but I can’t rev the engine and it stalls I’m stumped besides replacing the carb but like I said the carb ran decently rich before where the engine had good power and it ran after we rebuilt the carb even better so I’m just a little baffled
We understand! These carbs can be difficult when they act up. We've had that happen. The carb works sweet and then takes a dive. Usually after sitting. Many times, we had to just do a complete rebuild to cure it. The Q-Jet is all about vacuum signals. We've had to run a small wire through all the passages sometimes to be sure nothing is clogged. Also check and make sure the carb isn't warped causing air leaks around the gasket areas. This can be caused by overtightening the 4 outer intake manifold bolts. We've actually seen the main carb body twisted or warped. Check the flat gasket surfaces with an accurate straight edge.
Thanks for sharing. Good info!!
Damn, that’s a beautiful car!
Thank you!
The sound of that engine makes me miss my 1970 Buick Electra 225 they had the 370 horse 455 with 510 ft-lb torque... It was nicknamed the silver bullet because of its color
That's the exact car year and model this engine came from. It's been heavily modified over the years. It was a quick scoot stock in that 1970 lead sled!
@@NoTop442 with the right highway gears(2.41 or 2.56) those cars could get decent fuel mileage and still be able to smoke the tires because of the amount of torque the 455 made. If I still had the car, I would put dual three inch exhaust with quiet flow stainless mufflers and an x-pipe.
For sure. That '70 duece and a guarter would just float down the highway at 80 mph. Would make a good sleeper. Mine was a four door. Don't recall if they had two door 225s.
Is your apt adjustment in the throttle plate froze up
I have never adjusted the APT on one of those carbs. I always got my Rochester carbs to behave without it. Now that I have an exhaust analyzer, I may look into that for a deeper dive on my carbs. I suppose there may have been some APTs froze up over the years and I'm compensating in other ways.
You should have showed us the straw being sucked downward after replacing the power piston spring!
We have an Olds 442 acting up with a similar issue. We'll include the straw action on the next video!
@@NoTop442 Hot straw action, stay tuned!!!
NoTop442, Man...you are speaking my language here, thanks for a really informative video. I have a 74 Century GS that had been built to 70 Hi compression specs, with Poston Buick Pistons, 490 lift cam, Edelbrock Spredbore intake, MSD, Headers. Edelbrock 750CFM on it now, but I did invest in an NOS Rochester Carb from a 72 GS. I was hesitating on changing because it is running pretty strong now, but IMO< the Rochester gives more full throttle wallup than the square bore Edelbrock, though the throttle response from the Edlebrock is better then the Rochester...you have to EASE your foot into the Rochester, then Yee-ha....I think I need to set up my Rochester with a light spring like you did an try it out...LOVE your car NoTOP! damn..I have lots of great memories with GS455s from the 80s til now...rock on.
Above the secondaries on the Quadrajet there's a spring loaded flapper thing similar to the Edelbrock , but it can be adjusted. I suspect yours is out of adjustment. You shouldn't have to ease into it nor finesse it. There's a happy spectrum, just adjust to your liking.
Watch "How to adjust Quadrajet secondary air doors" on TH-cam
th-cam.com/video/QhNYMftwNUo/w-d-xo.html
Try this.
3/32 Allen + small flathead screw driver
I've got 3 - '72 Monte Carlos I only drive/own. One is a Big Block... Use points dist on them all. All stock, so nice auto. Bench seats are quite a bit more comfy than what cars have today. I really like your wheels on your car too! Always admired those wheels. Wish I could afford a house like you, then my cars would look as good as yours. But fine gentlemen trying to steal them when they look pristine, and people backing up into them, and then their personal body guy spraying clear on the repairs, which is peeling off, really sux being poor. Mobil mechanics not knowing how to do things, and I notice I am more capable than they are, and I am 67 right now. But only owned/driven 1st gen Montes since 1974.
Best street carb ever made!
We also have those carbs on our boat and you can't beat the part throttle fuel economy too.
Beautiful car! I have a 72 GS convertible. Buick's can run a ton of duration and sound real nasty at idle then they smooth right out and have a ton of torque. The most underrated muscle car ever! My 10 year old son would sneak the keys from me when I wasn't home just to hear it idle. I will admit it was the baddest sounding street car I've ever heard.
Thanks!
One of my buddies in the 80s (we were 19 year old pukes), bought a 70 GS convertible from another buddies neighbor. Turned out it used to be the parade car from some local douchebag politician. Anyhow, someone had installed a 800 CFM holley, and a 8 QT oil pan. It had an OPEN 3.08 (or 2.93?) but the damned thing once off the line was a goddamn bomb from Hell! We had 4 guys in this car (Keg of beer in trunk with nozzle thru seat..lol) and buried the 120 speedo by a ridiculous amount. We used to race motor cycles with that car...pissed off allot of people...(bikes were not as fast back then).
@@gt-37guy6 My dad had a Buick Wildcat and one of my friends dad was a mechanic at the Buick dealership and he dragged a stock but highly tuned GS to hi 12's. Very impressive. I bought this car from the Dupont family. I had some rust and someone dropped something on the top so it had to be straightened. I did a frame off resto. It's close to stock except for the leather seats. Motor has aluminum heads, moderate cam and manifold with headers. It's a sleeper for sure but always gets a lot of looks at car shows since there aren't many of them. Thanks for the comment. Your car is beautiful!
@@NoTop442
I love quadrajets. I had never heard of the straw technique.
😉👌
Having an issue maybe someone can help with rebuilt 454 with original Rochester carb rebuilt the carb and engine and has a mild cam in it now with done pistons and .30 over bore when I start it I runs and the minute you give it fuel from the throttle it stalls seems loaded up rich now however when you go and choke the carb manually after it warms up and the choke pulloff drops the idle increases almost giving me an indication of lean I’ve worked on these carbs since I was 16 an I love them but I’m not sure how to lean it out!? Everything on carb is original but gaskets and fuel mixture screws are still unmolested and not cut or replaced with adjustable jets however the carb ran decently rich before I spun a rod journal and cracked the crank that cause the rebuild any idea how to lean the engine out machine shop has everything set up for 93 octane and I’ve seen to found where it likes around 15-20 degrees initial timing just trying to dial in my total timing but I can’t rev the engine and it stalls I’m stumped besides replacing the carb but like I said the carb ran decently rich before where the engine had good power and it ran after we rebuilt the carb even better so I’m just a little baffled
We understand! These carbs can be difficult when they act up. We've had that happen. The carb works sweet and then takes a dive. Usually after sitting. Many times, we had to just do a complete rebuild to cure it. The Q-Jet is all about vacuum signals. We've had to run a small wire through all the passages sometimes to be sure nothing is clogged. Also check and make sure the carb isn't warped causing air leaks around the gasket areas. This can be caused by overtightening the 4 outer intake manifold bolts. We've actually seen the main carb body twisted or warped. Check the flat gasket surfaces with an accurate straight edge.
Nice sound!!
Thanks!
good vid
Thanks!