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1985K20
01-31-2005, 05:12 PM
Does anyone know what is the torque and horspower ratings for the GM 366 (school bus type)? A friend of mine's got one in his truck and always wanted to know.:confused:

Poohbair
01-31-2005, 05:23 PM
366's are garbage. Don't waste any time/money building one.

BlueBlazer62
01-31-2005, 05:27 PM
That's not what he asked, is it?

white-rhyno
01-31-2005, 05:43 PM
366's are garbage. Don't waste any time/money building one.

How is this relavent to the price of rice in china?

R72K5
02-01-2005, 09:00 AM
not going ot be only one answer for this, this engine was made for a long time and there will be many different torque and HP rated ones depending on year make model application and so forth, just liek with any other engine,

JIMs70K25
02-01-2005, 09:08 AM
I can check my 70 chassis manual this evening, ironicly I'm looking to purchase a 1970 C50 dump truck with a 366. If I remember correctly HP/TQ is 255/350 or something similar.

diesel4me
02-01-2005, 12:03 PM
I dont think the 366 is a "junk" motor--granted,its not a 427 or a 454,but it is a very durable and rugged motor,it has the tall deck and 4 ring pistons--from what I've read they can be bored 1/8 over to increase cubic inches...many parts are not the same as the passenger car and light truck big blocks,but many are interchangeable too..They are not noted for high power or torque,but they do last a long time..

I dont have any specs for horsepower or torque,but I'd say they are about the same as a stock 350 4 bbl motor--not a ball of fire,but they get the job done ok...:crazy:

RingMaster4x4
02-01-2005, 12:23 PM
I have a 427 Tall deck that came out of a 1985 GMC 6000. in my blazer and I love it I got about 13 MPG in it. It has a lot of TQ I guess it to be about 450 HP and 500- 550 TQ.

BlueBlazer62
02-01-2005, 12:27 PM
It has a lot of TQ I guess it to be about 450 HP and 500- 550 TQ.

Is it stock? If so, are you nuts? I would be surprised if its over 250 hp.

RingMaster4x4
02-01-2005, 12:30 PM
no not 100% stock. One of the big things that I belive ruens the motor is all the limiters and such that was install in the motors.

JIMs70K25
02-01-2005, 01:07 PM
From my 1970 chassis manual: 235 @4000 (235@4000) and 345@2600 (hp/tq)

Motor was optional on 50 series and standard on 60 series trucks. The 427 was opt on 60 series .

1985K20
02-01-2005, 04:09 PM
thanks y'all for you info, i appreciate!:)

Poohbair
02-01-2005, 05:20 PM
I have a 427 Tall deck that came out of a 1985 GMC 6000. in my blazer and I love it I got about 13 MPG in it. It has a lot of TQ I guess it to be about 450 HP and 500- 550 TQ.

The 427 talldeck and the 366 talldeck are 2 different animals. The 427 can be built to the hilt for the right price... the 366 is a boat anchor.

84_Chevy_K10
02-01-2005, 05:45 PM
the 366 is a boat anchor.

That is all anybody needs to know about a 366.

dyeager535
02-01-2005, 06:42 PM
Those are also going to be gross ratings, knock 20% off for net, which is how things have been measured for quite awhile.

WantedaDodge
02-01-2005, 07:07 PM
That is all anybody needs to know about a 366.

I guess if I had one, that ran, I would run it. But not if I had to build anything. Might get good gasmileage. 350 ft lbs of tork is pretty good for a stock motor. Would headers fit? tall deck, I'd think it might get screwed up.

diesel4me
02-02-2005, 09:16 AM
I would not mind having a 366 under the hood--like I said,its a rugged,long lasting motor,not a powerhouse!!--they are REAL dawgs in stock form,many of the C-60 trucks and busses have govenors on them to limit top speed and RPM's,so they are rather anemic--but you can wake one right up by installing a better cam and carb,and it would most likely outlast the truck its bolted too--the best part is it LOOKS just like the other big blocks,the bling factor alone is a plus!--

While we would ALL rather have a 427 or 454,or even a 396 or 402,the 366 is not just a throwaway motor by any means--they use the 366 in the trucks and industrial applications that would kill most of the other motors quickly...it would make a good work truck motor for a 1 ton flatbed or plow truck.....and there is a lot more 366's in the yards in busses and big "C" series trucks than any other size big block,so its about the last big block chevy you can buy reasonable anymore...:crazy:

JDBlazer454
02-02-2005, 10:42 AM
I ran one in a 75 K5 of mine as a temp motor and ended up keeping it. Its not a ball of fire like said before but it has a good torque feel to it its not a high revver at all very very low rpms and your at the top of your power band. They are good cheap big block power to build because most people just give them away, mine was free out of a 73 2 ton pump truck.

Ddragggon
02-02-2005, 12:18 PM
The 366 motor was designed to be a long lasting industrial powerplant, with a larger bore, but smaller stroke than a SBC 350. The short stroke kept the friction down, allowing these motors to last upwards of 300,000 miles, with little/no rework on them. ( At least I think it's the 366 that is built that way... could be confusing for an old GMC V6)

POWERMAD
02-02-2005, 03:01 PM
While we would ALL rather have a 427 or 454,or even a 396 or 402,the 366 is not just a throwaway motor by any means--they use the 366 in the trucks and industrial applications that would kill most of the other motors quickly...it would make a good work truck motor for a 1 ton flatbed or plow truck.....and there is a lot more 366's in the yards in busses and big "C" series trucks than any other size big block,so its about the last big block chevy you can buy reasonable anymore...:crazy:

My buddy just loves the 366 and 427 truck BBC's. They make for a nice hual to the scrap yard.

As far as the 366 being the last reasonable priced BBC, I dunno about that around here 454's can be had for pretty cheap nowdays.

As for myself I can see logical reason to drop a 366 in a rig. Free or not.

WantedaDodge
02-02-2005, 03:04 PM
can you bolt a set of 396 heads on them? or are they different.

I'd consider putting one in my truck, all I want is about 300 HP and 400 ftlbs of torque. I think that would be easier for a big block to handle, better cooling ect...

Will HEI and standard manifolds work>?

POWERMAD
02-02-2005, 03:17 PM
Truck BBc's are .400" taller than pasenger blocks.
Regular manifolds will not work, the heads will bolt on though. But it is still a moot point.

For the $$ ya could build a SBC that would walk all over a 366 and be shloads lighter too.

If ya are interested in a real BBC shoot me an e-mail. I have a 454 and TH400 for sale.

Quaddawg
02-02-2005, 03:38 PM
366's are heavy, and make close to the same range of power as a small block, so for cars, they aren't good choices.. but they are tough as nails, and run and run and run.. they have a bit more torque as a rule.. not a horrible choice for a truck.. not a racing motor, and almost worthless to a hot rodder... but you could have worse engines in a one ton for example...

akbound
02-02-2005, 03:38 PM
info from amotion.com:

PARTS COMBINATION GUIDEParts that do not match stock specs are intended only for vehicles that do not require pollution controls.
RV AND COMMUTER (1000 rpm to 4000 rpm, max. HP @ 5000 rpm)

Good fuel economy, medium towing and improved mid-range performancefor every day use. No internal engine modifications are required.

ENGINE CAM RANGE* AIR/FUEL RANGE HORSEPOWER

366 w/1.840 19833 to 20633 539 to 674 cfm Max. 293 HP
366 w/1.940 19733 to 20533 539 to 674 cfm Max. 293 HP
396 Oval Port 19803 to 20603 583 to 729 cfm Max. 317 HP
396 Rect Port 19683 to 20483 583 to 729 cfm Max. 317 HP
*The cam range refers to the 2nd half of the Accelerated Motion part number.Compression: Gasoline 9.5:1 or less, Propane 11.0:1 or lessExhaust: Stock, dual exhaust, or small tube headersFuel Inj.: Factory EFI computers might require modificationGear Ratio: 3.9:1 or lower (numerically)Idle: 650 rpm or lessIgnition: Recurved distributor and electronic ignition

MILD PERFORMANCE (1400 rpm to 4400 rpm, max. HP @ 5400 rpm)Fair idle, moderate fuel economy, improved mid-range performanceand enough torque for medium/heavy towing. Nice for ski boat.
ENGINE CAM RANGE* AIR/FUEL RANGE HORSEPOWER
366 w/1.840 20633 to 21433 606 to 750 cfm Max. 329 HP
366 w/1.940 20533 to 21333 606 to 750 cfm Max. 329 HP
396 Oval Port 20603 to 21403 656 to 811 cfm Max. 356 HP
396 Rect Port 20483 to 21283 656 to 811 cfm Max. 356 HP
*The cam range refers to the 2nd half of the Accelerated Motion part number.Compression: Gasoline 8.5:1 to 10.0:1, Propane 10.0:1 to 11.5:1Exhaust: Stock dual exhaust or small tube headersFuel Inj.: Factory EFI computers will require modificationGear Ratio: 3.1:1 to 4.1:1Idle: 700 rpm or less, slight lopeIgnition: Recurved distributor and electronic ignition

PERFORMANCE (1800 rpm to 4800 rpm, max. HP @ 5800 rpm)
Good upper mid-range performance.Works well for medium and heavy towing with low (high numerically) gears.Good for jet boat and skiing. Biggest for I/O boat.
ENGINE CAM RANGE* AIR/FUEL RANGE HORSEPOWER
366 w/1.840 21433 to 22233 675 to 827 cfm Max. 366 HP
366 w/1.940 21333 to 22133 675 to 827 cfm Max. 366 HP
396 Oval Port 21403 to 22203 731 to 894 cfm Max. 396 HP
396 Rect Port 21283 to 22083 731 to 894 cfm Max. 396 HP
402 Oval Port 21443 to 22243 742 to 908 cfm Max. 402 HP
402 Rect.Port 21323 to 22123 742 to 908 cfm Max. 402 HP
427 Trk 1.84" 21840 to 22640 788 to 964 cfm Max. 427 HP
427 Trk 1.94" 21740 to 22540 788 to 964 cfm Max. 427 HP
427 Oval Port 21610 to 22410 788 to 964 cfm Max. 427 HP
427 Rect.Port 21490 to 22290 788 to 964 cfm Max. 427 HP
454 Trk 1.84" 22020 to 22820 838 to 1025 cfm Max. 454 HP
454 Oval Port 21790 to 22590 838 to 1025 cfm Max. 454 HP
454 Rect.Port 21670 to 22470 838 to 1025 cfm Max. 454 HP
*The cam range refers to the 2nd half of the Accelerated Motion part number.Compression: Gasoline 9.0:1 to 10.5:1, Propane 10.5:1 to 12.0:1Exhaust: Dual exhaust, headers are recommendedFuel Inj.: Performance EFI system recommendedGear Ratio: 3.3:1 to 4.3:1Idle: 750 rpm or less, small lopeIgnition: Recurved or perf. distributor, electronic ignition

:D

WantedaDodge
02-02-2005, 04:41 PM
allright, so how do you build a 365 hp 366?:D

original balzer
02-03-2005, 01:55 AM
id like to add some interesting points on the 366 the crank is strong and can be used in other big blocks and every 366 i have seen (6 or 7) has had a 9 quart oil pan so ya might want to consiter loading up a free 366 if your a big block fan

willow

ben427
02-06-2005, 08:09 AM
Nuthing wrong with the old tall decks. Forged rotating assemblys, 4 bolt mains. Gobs of bottom end torque, but run out of breath at 3500-4000 A good set of heads alone would help a lot. You can run normal big block pistons, but you need to us 6.535" rods. Also a good block to stroke out. You can also get intake manifold spacers to run standard intakes on the tall deck blocks.