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-   -   Bbc Tall Deck Block 366 Question (http://www.hotrodders.com/forum/bbc-tall-deck-block-366-question-211407.html)

peetyweet 12-31-2011 07:10 AM

Bbc Tall Deck Block 366 Question
 
Hey guys, I recently acquired a tall deck 366 big block chevy w/ oval port heads. I know that I have to use spacers to use a regular intake but the intake that I have is a square port intake. I've been told by 2 people that the spacers will allow me to use my square port intake on the oval port heads. I asked my machine shop guy this question & he strongly urged me not to try it. He stated that the intake may work but the engine would run like crap. Does any one out there have any direct experience w/ something like this.

Note: I wanna use my square port intake for 2 reasons.....1) I don't have the cash to buy another one & 2) the intake that I have is an air gap intake that will boost performance. This is not going to be a hot rod motor......its going in a 93 dually work truck.

matts37chev 12-31-2011 07:34 AM

they are not cheap, here are the spacers , for that kind of money, I would find an intake


I wonder :confused: will a 572 intake work on a 366????anyone :confused:

whyholdback 12-31-2011 07:38 AM

You're trying to put a tall-deck 366 in a '93 pickup? And you're too cheap to buy an intake?
First of all, that AirGap intake you have won't help the performance of a 366, it won't even help a mild 454.
The 366 won't even out-perform a stock LO5 TBI 350, but it'll drink at least twice the gas.
Next, if you're gonna try to fit a tall, heavy old tall-deck in place of the short-deck 454 that was offered as an option in your pickup, then scrap the crap 366 and go find a tall-deck 427 with it's original stock iron 4-barrel intake manifold.
This still won't fit right, and won't do anything better than the short-deck, peanut-port 454 that's supposed to be in your pickup, but you can get these for free, the 454 will run you at least $150, maybe as much as $200, which you said you can't afford.
Sell the AirGap intake, scrap the 366, and go get the correct 454. Far better than the extreme mis-match you proposed, which will never do anything well. In fact, it's such an extreme mis-match that even a carbureted stock peanut-port 454 will give more MPG along with more power and torque.
If you can't afford to do it right the first time, you can't afford to fix it after you try it the wrong way.

peetyweet 12-31-2011 07:38 AM

Thanx Matt but I found a set of spacers online for only $60.....so I'm stuck w/ them now. Any more suggestions???

matts37chev 12-31-2011 07:47 AM

Quote:

Originally Posted by peetyweet
Thanx Matt but I found a set of spacers online for only $60.....so I'm stuck w/ them now. Any more suggestions???

that was quick
i kinda agree with some of whyholdbacks' post
a 454 would be a lot better choice unless you want build this 366 because its different

but if you have done ANY home work at all, you know that already :thumbup:

peetyweet 12-31-2011 07:57 AM

Hold back.....some good info but where can I find a 454 for $200?? Everywhere I look people are asking $800 or better. And I'm using the 366 b/c I was able to trade for it & after doing a fair amount of research, I found that this 366 comes stock w/ 300 hp & 360 lbs of torque. I figure w/ a decent intake, headers, & 750 carb, I could easily increase those #'s to 350 hp & 400 lbs of torque....which is more than enought for the work that it will be doing.

whyholdback 12-31-2011 08:19 AM

Quote:

Originally Posted by peetyweet
Hold back.....some good info but where can I find a 454 for $200?? Everywhere I look people are asking $800 or better. And I'm using the 366 b/c I was able to trade for it & after doing a fair amount of research, I found that this 366 comes stock w/ 300 hp & 360 lbs of torque. I figure w/ a decent intake, headers, & 750 carb, I could easily increase those #'s to 350 hp & 400 lbs of torque....which is more than enought for the work that it will be doing.

The 366 may have 300 Gross HP, but that was with headers and no accessories like power steering, and no exhaust or mufflers. That was how they rated engines until '71. Now we use Net HP, which is with everything an engine has in the vehicle. Huge difference. Anywhere from 30-100 HP depending on the combo.
As for a 454, go to Pick-N-Pull, or your local equivalent. I've found them from Norcross, Georgia to southern California, so they're pretty much everywhere.
You use their hoist, you do the labor yourself, you remove what you need from the car (or pickup)
Any 75-'89 454 from a 3/4-ton or 1-ton pickup would be a great choice, but before pulling it, pop the valve covers and intake manifold to check for any issues. Once it's out, pop the pan and check thoroughly before going any farther. You'd be mad if you got it home then found a spun bearing, right?
Plan on investing $50 in a full set of new gaskets, and replacing every gasket in the engine.
The 366 really doesn't work. The large oval ports are just too large for 46 cubes per cylinder to create any port velocity. Peanut-port heads would help, except then you'd have maybe 7:1 compression at best, and noone makes peanut-port spacers to put these heads on tall-deck blocks.
You'd be seriously better off with virtually any 350 than with that 366. They're long gone for good reason. Plus the 366 heads never had hardened exhaust seats, AFAIK, so you're gonna have costly problems there, now or very soon.

peetyweet 12-31-2011 08:41 AM

More good info hold back.....let me add a few things to the equation to see if makes a difference. The 366 that I have is a LS1 motor out of a 98 c-60 & was a throttle body engine. It has decent stock heads (not great) & dome pistons that provide 9:4:1 compression. Btw, this isn't my 1st choice of engines to drop in my truck....as a matter of fact its not my 2nd or 3rd choice either but again, I got it on trade for next to nothing & I'm trying to make it work as inexpensive as I can. I've had the intake for sale on craigslist for at least a month & no interest. I live in GA & I'm familiar w/ pick & pull so Imma prob check them out to see if they have a 454. But, I'm probably still gonna try to make this engine work for the time being.

matts37chev 12-31-2011 08:55 AM

?????????????????????????????????????????????????? ??????????
talk about changing horses in the middle of the stream--ls1?
you need to do MORE homework before you spend another nickle

whyholdback 12-31-2011 08:59 AM

Quote:

Originally Posted by peetyweet
More good info hold back.....let me add a few things to the equation to see if makes a difference. The 366 that I have is a LS1 motor out of a 98 c-60 & was a throttle body engine. It has decent stock heads (not great) & dome pistons that provide 9:4:1 compression. Btw, this isn't my 1st choice of engines to drop in my truck....as a matter of fact its not my 2nd or 3rd choice either but again, I got it on trade for next to nothing & I'm trying to make it work as inexpensive as I can. I've had the intake for sale on craigslist for at least a month & no interest. I live in GA & I'm familiar w/ pick & pull so Imma prob check them out to see if they have a 454. But, I'm probably still gonna try to make this engine work for the time being.

Impossible. The LS1 is 346 CI, in '98 was offered only in Corvettes and Camaros, and was never TBI. Also, NO GM car V8 had domed pistons after 1972.
I'm 99% sure the 366 was long gone by '98, and I'm not convinced you know exactly what you got your hands on.
It doesn't take more than a 350 to make full use of the capabilities of a dually pickup, you'll just be going a little slower when towing a maximum load.
Doing a 350 install will be far cheaper and far easier, and will give more real torque, and better gas mileage, than that 366.

peetyweet 12-31-2011 10:18 AM

Matt....this isn't the Ls1 motor w/ the coil packs....I only refer to it as an LS1 motor b/c that's how summit labels it when trying to find parts for it.
Holdback....I've done extensive research & I'm 99.999% positive that this is a 366. I ran the vin w/ a local chevy parts department & thats what it brings up....Its a 6.0 liter 366 ci motor. I tried running the #'s on the block but couldn't pull any info on it.....the 2nd & last # are blurry....its 13237298...but the 3 could be an 8 & the 8 could be a 3. Tried running diff combo's but still nuthing. And I'm 100% positive it has dome pistons. Tried taking pics but they came out too dark. As a matter of fact, Chevy still makes a 366 cubic inch engine (w/ coil packs) w/ 360 hp. They come in some of the new 2011 2500 HD trucks w/ allisson transmissions.

whyholdback 12-31-2011 11:02 AM

If you're not trolling, then you're at least confusing 2 different engine families.
In the late '60s, GM introduced a tall-deck 366 truck block engine for MDTs. It may well have had domed pistons.
In '99 GM introduced the 6.0L LQ4, based on the then-new LS1. But it was never TBI, and it never had domed pistons. It did have 8 coils.
The 6.0L is 364 cubic inches, not 366. In the automotive world, is is extremely critical to get every number exactly precise, or you create the problems seen in this thread.
ALL 364s have 8 coils. 4 on each valve cover. This is sometimes called having a pair of coil packs.
There are NO exceptions to what I've typed about the modern 6.0L, I'm very clear on every detail of it.
Trying to swap the modern 6.0L into your '93 dually would make for powerful results, but is a very costly proposal, with lots of hassles. If you can't afford a $800 454, which you say is your local asking price, then you sure can't afford to do this swap and get it running. I know, I've done several of my own, including buying used detail items and fabricating my own wiring harnesses.
The old 366 would be easier and cheaper than the modern 364, though the 364 would fit better.
Go figure out what you have. If it is a modern 364, sell it and buy a 350 or a 454. If it's an old 366, it's scrap metal at best.

peetyweet 12-31-2011 01:04 PM

hold back.....you have a ton of knowledge & I appreciate you blessing me w/ it.....but I am 100% positive that this is a 6.0 366 & it doesnt have the coil packs. Wish you were in the Atlanta area so you could help me out in person b/c it sounds like you have ton of knowledge that could help me on this & other projects.

61pontiac2dr 01-21-2012 07:01 PM

I built up a 366 tall deck and ran great . You will have to change cam and water pump.To use square port intake ,either buy square port heads or oval port intake to go with your heads. I also had a machine shop machine the collar off an hei dist, and made a adjustable collar.Everything else is the same as 396 or 427.,except pistons they have 3 compression rings and compression is I think 8.5.

peetyweet 01-22-2012 06:07 AM

thanks pontiac.....I spent countless hours & about $500 to get this motor ready to run & then when I found out that the adjustable distributor was $400 I decided to go in a different direction. I still have the block & may use it in a different application later down the line.


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