366???

[oldsmobilekindofguy]

I was ust wonering, has anyone teyed throwing a 366 out of and old chevy grain truck into one of our trucks, I mean those old grain trucks could go 65-70 with a load of corn, you would think they would make one of our trucks cruise pretty good.

It was just a though I hd since I have an old grain truck with a 366 in it. BTW does anyone have a clue what the 366s made for power?

[WorkinLonghorn]

In '69 it was rated at 235 Gross @4000,and 345 torque@2600.
It has the BB stroke with 3 15/16th bore.

[oldsmobilekindofguy]

thanks but has anyone put one in their truck?

[Longhorn Man]

I've seen it done, guy said it tugged like an inline. (he was very UNimpressed)

[Critter]

I have wondered the same thing...

http://67-72chevytrucks.com/vboard/s...d.php?t=227649

Most seem to think it is bad idea, but don't let someone else's opinion stop you.

[1969stepside]

please post pics of this motor

[Billla]

A 366 BBC is just a small-bore 396 - 3.935 bore by 3.76 stroke. It's going to pull about like mild 383 small-block. Nothing magical here...

[Bob B.]

Remember that 366's are 'tall deck' (because the used a 4 ring piston). Not all Big Block intake manifolds will fit. They are all low compression, with 'peanut port' small valve heads, hardend valve seats and valve rotaters. Most had Holley 4150G 4bbl. carbs with governors. The 366 in a C-60 also has a high-mount water pump, but you can replace it with a 396 pickup water pump (you will have to rework the bypass hose though). Built for work and durability, not much else. I think if you had tall gears, it might run pretty good in a pickup. No need to post any pictures, the 366 looks like any other Big Block.

[caminokid]

Alot of dump trucks and school buses had them. Not the motor I would use. Being a tall deck makes things rough to get for it.

[schwoch1]

They were kinda gutless in the big C60's and such. I have seen a few in 1 ton trucks that people tossed them in, and to be honest, they had the same amount of power as the low compression 454's of the era. Maybe with a load there would be a difference, but unloaded, it was hard to tell any difference. It took a little creativity to get some of the brackets and exhaust to line up, but it can be done, they bolt right in to the same spot as a normal big block!!!

Mike

[Shyguy]

I don't know how the 366 is, but I have a tall deck 427 in my GMC 6500 dump truck and it is a slow reving, stump pullin son of a gun.

Danny

[smoknbarrels]

we've got a 366 in a C60. and pretty much thats all its good for. the engine can't rev up fast as it has so much inertia with the big crank, counter weights, and flywheel. is really just meant for lugging and low rpm torque. no decent parts cross reference with this motor. it's heads are junk, has small displacement... i think the only really good thing on this motor is the holley sitting on top!
but mind you it is quite durable.
I'd never throw it in a half ton.

[schwoch1]

Originally Posted by smoknbarrels

we've got a 366 in a C60. and pretty much thats all its good for. the engine can't rev up fast as it has so much inertia with the big crank, counter weights, and flywheel. is really just meant for lugging and low rpm torque. no decent parts cross reference with this motor. it's heads are junk, has small displacement... i think the only really good thing on this motor is the holley sitting on top!
but mind you it is quite durable.
I'd never throw it in a half ton.

The couple I have seen had the 1000 lb flywheel removed and a standard flywheel installed, and they reved pretty much the same as any other big block engine would. You are right though, almost no interchange, and even the Holley on top usually has a governor, but that can usually be taken care of

Mike

[70rs/ss]

A tall deck actually would allow for a stroker crank, a good set of GEN VI BBC Vortec heads and away you go, short stroke, small displacement means R's to me? Merlin makes tall deck blocks all day everyday, why would parts be hard to find, just more room inside the motor for that above mentioned stroker crank!! I'd guess any decent piston manufacturer could make a set of modern pistons for it to help it perform. Now, that I said all that, it isn't going to run much better than a mildly built 454, and it will cost more $$$ to do it, but being different usually costs more and the folks that live outside of the box assume that as one of the prices of not following the herd of sheep, do it, I am interested as I know where there is literally a stockpile of tall deck 366's, 427's!! They use them here in AZ as pump motors for irrigation, litterally hundreds of them in farm country and the farmers don't hassle with rebuilds, as the down time costs more than the savings of rebuilding over buying ready to go motors.

[oldsmobilekindofguy]

I like the way 70rs/ss thinks, The motor is virtually free and from what you guys are telling me a set of heads and a different flywheel, and an intake I could have a pretty decent big block that not everyone and their dog has in their 1/2 Ton

And on the C60s beside the flywheel the low revving also has a lot to do with the gears and most have the two speed axel which has to have an affect on it.

And I am always up to a challenge

[Longhorn Man]

actually, the gearing is there to react to the reving. With the extra low gearing, it should rev quicker, not slower.
Installing an intake required spacers, and you'll have to use a dist that is made for the tall deck... I don't know how easy it would be to locate an HEI for it too.

[oldsmobilekindofguy]

good point

[schwoch1]

Originally Posted by Longhorn Man

actually, the gearing is there to react to the reving. With the extra low gearing, it should rev quicker, not slower.
Installing an intake required spacers, and you'll have to use a dist that is made for the tall deck... I don't know how easy it would be to locate an HEI for it too.

Intake spacers are readily available, Summit Racing or Jegs carries them, and as far as an HEI, gm used them in the 366 and 427 from the factory, the aftermarket also makes distributors also. Some of the OEM ones had no vacuum advance in them or had governors built into them, but with a little creativity, you could make it work.
If the 366 is in good condition, and the right price, why the heck not! 9 out of 10 people would have no clue that it was different than a normal big block, and if you are not looking or a romp stompin motor, just a good running big block, I would go for it!!!

Mike

[1969stepside]

i have never seen this motor before? why didnt chevy use a v-6 insted of an inline-6?

[bigblockV6]

Originally Posted by 1969stepside

i have never seen this motor before? why didnt chevy use a v-6 insted of an inline-6?

Chevrolet did use the GMC V6 in their bigger trucks during the early 70's, 73-74 60-65 series used 305, 379 and 432 V6 engines along side with Chevrolet's 292 inline 6, 350, 366 and 427 V8's in these medium duty trucks.

[oldspowered]

just put a olds motor in it. that is what dad and i are doing to my 71 super!

[schwoch1]

Originally Posted by 1969stepside

i have never seen this motor before? why didnt chevy use a v-6 insted of an inline-6?

Looks like any other big block Chevrolet motor, you probably may have seen one at some point, but would not of known it. As far as I know, the V-6 was GMC motor, not a Chevrolet. Even though the GMC could come with a Chevrolet motor, I never seen a GMC motor in a Chevrolet. That was long before the days of the 'GM corporate' engines that we had in the late 70's and 80's. Chevrolet has always had inline 6 cylinder engines darn near since the beginning of time, GMC went the way of the V6, Chevrolet stuck with the inline 6 for some reason! One of those great mystery's that we may never know the reason behind!!!

Mike

[Billla]

Seems like a lot of work and expense for 16 more CID than a 350 I ran a quick DesktopDyo advanced with a set of upgraded oval-port heads and a mild CompCams cam (268H) and came away with 410HP @ 5500 RPM and over 400TQ from 2000 - 4500 RPM with a peak of 445 @ 4000. Nice numbers, especially that torque curve, but also about what we'd see with a medium 383 build...likely for a lot less money and trouble than making a 366 work.

Yes, you could stroke it...but the bore size is the limiting factor here. A 4.375 stroke will deliver 425 CID (std bore)...but that same stroke with a 454 yields 496 CID! It's just kind of a diminishing return thing given the bore size. An "undersquare" engine can be a good high RPM engine...but turning a BBC to high R's is an expen$ive proposition given the weight of the components involved - so we're spending even more money to "make something work".

[Bishops Trucks]

I'm building a 427 talldeck for my '71 C10 project. I can't think of the name sell performance stuff for tall decks. I haven't decided yet but I am either stroking it to a 471 or 525. You can use a standard bigblock intake with the spacers or there is a company that makes performance intakes for talldeck blocks. I'll find the info and post it.

[Billla]

GM makes a high-rise, single plane manifold for tall-deck blocks, used on their 572's. P/N
88961161.

They're available from other major vendors as well; I haven't seen anything other than tall, single-plane manifolds as you're typically feeding a lot of CID IMHO, this would make a mild 366 build a dog, but the spacers look like they're only about $175.

I've never used the spacers - any sealing problems?