PDA

View Full Version : 6.5 ,big block ,smallblock?



murd450
10-30-2007, 03:34 PM
is the 6.5 based on the big block or the small block ? i know it is 396 ci . and it is im posibal to get that displacement frome a small block whith out clerancing the block , a guy at work says it is a glorafied smallblock! i say he has his head up his @$$:eek: if any one could resolve this dispute it would be great the loser has to buy lunch:D

TedReminder
10-30-2007, 04:24 PM
Enjoy your free lunch. Actually it is neither small block or big block. It was a purpose built diesel from the start. Your friend probably heard about the 350 converted gas motor. The 6.5 ain't that engine.
Ted

murd450
10-30-2007, 05:25 PM
he said it was a glorified 350 !he allso tried to tell me it had a 4in bore even if that were so it would have to have one hell of a stroke and that would mean if it were based on the small block it would need some clerancing done and the crank fits in there real nice (doing rods,mains ,and an oil pump) got the pan off one right now ! personaly i figured that the bace for the block was the 396 big block , with allot of mods , and if im not mistaken the pump boss in the block is cast right in , i have had a few apart and changed a few but neve took one a part out of the engine bay!but thank you that is a great piece of info that i did not know before:eek:

hraney
10-30-2007, 07:31 PM
Even the "Converted" gas engine was a real diesel. The 5.7 was based on the Olds engine, but its not like they just knocked a hole in it for the pump and put injectors in the spark plug holes. I think even the internal webbing was thicker on the Diesel 5.7 than the Olds 350 gasser (been a while since I had 2 of them side by side)

Oldsmoke
10-30-2007, 07:39 PM
A friend once told me that the 6.2 - 6.5's were DD designed.

torque454
10-30-2007, 11:07 PM
DD Designed?

grancito
10-30-2007, 11:10 PM
Yes the 6.2 was designed by Detroit. I like to say that when the Ford and dog sorry Dodge people say "isn't that a converted 350 chev engine"!!!!

torque454
10-30-2007, 11:13 PM
Oh oops i get it now. Yea theyre both detroits, alot of the parts interchange. Thats why you see injectors and glow plugs that say they'll fit both the 6.2 and the 6.5.

murd450
10-31-2007, 06:14 AM
i knew the 6.2 and 6.5 were the same i dident know they were dd engins but should have realized that the injector soket i use to change inj is dd specific ,and it does look like a smaller verson of the silver 98 (think that is the right # ) used in the coach busses, 80's busses ! :D so me and my co worker are bolth wrong ,except for the fact that he says it cant be a 396ci becase it has a 4in bore (i dont know the bore and stroke my self) so it is a 350ci but it cant be ,6.5 comes out to 396ci and a few pages in the lmc truck catalog it has engine designation and it says 396ci6.5 td:cool:

deerefanatic
10-31-2007, 06:37 AM
It's a 6.5.... Your buddy is wrong about just about anything he says about this engine! :D

BlazeGM4
10-31-2007, 12:27 PM
It depends on where you get your sources from as to what cubic inch the 6.5 is. Sealed power and Felpro gaskets list the 6.5 as a 395cu and others designate it as 397cu.
The bore and stroke of the 6.5 is 4.06 x 3.82, since the 6.2 these engines are purpose built diesels designed by Detroit with very little in common with a GM gasoline V8. Even if your friend thinks that these are derived from a small block chevy they would never be able to house a crank with a 3.82" stroke, even the 396 big block stroke is just 3.76". The 6.5 diesel shares the same bore size as the Duramax and nearly the same stroke (0.08" difference)
Your friend is trying to compare apples to oranges.
http://www.metsmachineshop.com/images/00290.JPG

deerefanatic
10-31-2007, 09:48 PM
Hmmm.... Maybe we could utilize the duramax after market for pistons!! :D

murd450
11-01-2007, 05:56 AM
yesterday morning when he came to work i told him we were bolth wrong !That it was nither big nor a small block and that the engine was a perpose built diesel by dd and he told me i was wrong and the fackt that it had a 4in bore ment it was a small block (i dont persolaly know the size of the bore) !:mad: but all he did was prove he had his head up his #$$,he allso said that i all ways had to be right , did i just prove my self wrong allso:rolleyes: but thanks for the good in fo guys:cool:

BlazeGM4
11-01-2007, 04:45 PM
Take the big block Chevrolet 396. It's bore is only 4.094".
And the small block Chevrolet 400, bore is 4.12"
And the Cadillac Sixteen...bore is 4.13" ask him is the Cadillac Sixteen engine is a small block :P

SCREAMINXL
11-01-2007, 05:52 PM
Hmmm.... Maybe we could utilize the duramax after market for pistons!! :D
If we only had direct injection!:)

torque454
11-01-2007, 08:42 PM
yesterday morning when he came to work i told him we were bolth wrong !That it was nither big nor a small block and that the engine was a perpose built diesel by dd and he told me i was wrong and the fackt that it had a 4in bore ment it was a small block (i dont persolaly know the size of the bore) !:mad: but all he did was prove he had his head up his #$$,he allso said that i all ways had to be right , did i just prove my self wrong allso:rolleyes: but thanks for the good in fo guys:cool:

Your buddy is as big of a dumbass as the guy that told me a 6.5 was a 454 converted to diesel. LOL. Thats not even close to right.They share basically nothing in common. And besides a 454 is 7.4L anyways thats a lil ways from being 6.5L. Bore size does not determine if its a big block or small block. Its actually um, the size of the block that matters. LoL. However, a smallblock couldnt house the bore size of a big block either. A 454 has a 4.25" bore and a 4" stroke. The 400 SBC should have been a big block, its bores are so big there isnt any room for a water jacket between them. They are "siamesed" together. But reguardless the 6.5 isnt big or small block, nor is it even a chevy engine. And just for the record the 6.5 has a 4.06" bore and a 3.82" stroke for a total displacement of 395.64 cubic inches or 6473CC. (4.06 x 4.06 x 3.82 x .7854 x 8 = 395.64). So technically the 6.5 is 396ci :D

BlazeGM4
11-01-2007, 09:52 PM
World Products makes a small block with 454cu. Bore is 4.250" with a 4" stroke. :)

http://www.hotrod.com/techarticles/engine/113_0307_454_small_block_crate_engine/index.html

torque454
11-01-2007, 10:35 PM
World Products makes a small block with 454cu. Bore is 4.250" with a 4" stroke. :)

http://www.hotrod.com/techarticles/engine/113_0307_454_small_block_crate_engine/index.html


Yes they do but it dont think the block is a factory cast block, i think its a reporduction. The 400 SBC had overheating problems with the 4.125" bore due to the siamesed cylinders, i can only imagine how bad it would be on a 454 SBC if the block was the same design.

BlazeGM4
11-01-2007, 10:43 PM
It's definately aftermarket. I was just showing for fun.

murd450
11-02-2007, 06:02 AM
yep i was not impresed when he said bore size detemans big block or small block but he has been doing this for 4 years now ,and will not ask me for tech help he asks a guy whith only 5 years underhis belt (i got 21 years started in my fathers gradge at 8 years old if i wanted to eat i had to work), but now he says (another van whith a 6.5 ) that a vac problem is making another engine stall at idel (says the vac pump is going bad and thats why it stalls when you aply the bake IT HAS HYDRO BOOST!!) i just stoped trying to help him let him hang him self:cool: he said the van has 14lbs at an idel (boost)all the way through the revs and that it had a boos sensor code (duh)so he as he said erased the problem (codes) . and they gave this guy a management position :eek:

murd450
11-02-2007, 06:06 AM
ow buy the wav the 350 small block can go as far as 427ic whith the right machenest and the 400 block can go to 454ci (bolth small blocks ) but it cost big $$$$$ and the machine shop has to be really good !there is no room for error:cool: