402vs427
Thread Starter
Melting Slicks
Joined: Feb 2008
Posts: 3,405
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From: Gboro/H-point/Reidsville NC
402vs427
Can someone go into detail the benefits of the 402 over the 427.You see alota guys going this route,but wouldn't the added cubes of the 427 yeild more power. Also is it safe to say that once you go over 400 your not a small block any longer.I know you have the 572 beast,but thats a whole other level. lastly is a forged 402 any stronger than a forged 427?
Le Mans Master
Joined: Nov 2005
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I seldom read a post that befuddled me as totally as this one. I'm trying to figure out what this has to do with C6 general discussion.
Small block/big block refers to the size of the block not the displacement. Back when I was a hot rodder in gen one Camaros a 402 was a .30 over ( I think ) 396.
Uh, the 396 is a big block. I suppose you can get 402 out of a small block too but it would not be as strong block wise. There are 427 big blocks from the ooooooooold days. Then there is the 427 small block in the Z06 that make all the owners so proud to own a "big block" which it ain't.
You wouldn't by any chance have a Camaro would you?
Small block/big block refers to the size of the block not the displacement. Back when I was a hot rodder in gen one Camaros a 402 was a .30 over ( I think ) 396.
Uh, the 396 is a big block. I suppose you can get 402 out of a small block too but it would not be as strong block wise. There are 427 big blocks from the ooooooooold days. Then there is the 427 small block in the Z06 that make all the owners so proud to own a "big block" which it ain't.
You wouldn't by any chance have a Camaro would you?
Thread Starter
Melting Slicks
Joined: Feb 2008
Posts: 3,405
Likes: 3
From: Gboro/H-point/Reidsville NC
I seldom read a post that befuddled me as totally as this one. I'm trying to figure out what this has to do with C6 general discussion.
Small block/big block refers to the size of the block not the displacement. Back when I was a hot rodder in gen one Camaros a 402 was a .30 over ( I think ) 396.
Uh, the 396 is a big block. I suppose you can get 402 out of a small block too but it would not be as strong block wise. There are 427 big blocks from the ooooooooold days. Then there is the 427 small block in the Z06 that make all the owners so proud to own a "big block" which it ain't.
You wouldn't by any chance have a Camaro would you?
Small block/big block refers to the size of the block not the displacement. Back when I was a hot rodder in gen one Camaros a 402 was a .30 over ( I think ) 396.
Uh, the 396 is a big block. I suppose you can get 402 out of a small block too but it would not be as strong block wise. There are 427 big blocks from the ooooooooold days. Then there is the 427 small block in the Z06 that make all the owners so proud to own a "big block" which it ain't.
You wouldn't by any chance have a Camaro would you?
Last edited by 94-vette; Nov 4, 2008 at 01:57 AM.
Le Mans Master
Joined: Nov 2007
Posts: 6,422
Likes: 200
From: Wilkes-Barre Pa
A few forged engines. You can see exactly where the 402 comes from.
http://www.eastcoastsupercharging.com/Engines.html
http://www.eastcoastsupercharging.com/Engines.html
Thread Starter
Melting Slicks
Joined: Feb 2008
Posts: 3,405
Likes: 3
From: Gboro/H-point/Reidsville NC
A few forged engines. You can see exactly where the 402 comes from.
http://www.eastcoastsupercharging.com/Engines.html
http://www.eastcoastsupercharging.com/Engines.html
Safety Car
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Melting Slicks
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Safety Car
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1. Much lighter and therefore handles much better.
2. Makes more horse power.
3. Is much more fuel efficient.
That's enough, I don't want to rub it in. BTW I owned a 1970 with the 454 so I know exactly what I am not missing.
Last edited by blazeone; Nov 4, 2008 at 04:17 PM.
Racer
Joined: Sep 2005
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Well, if we're going to be that way about it. The LS7 sure isn't a big block motor. No sir it is:
1. Much lighter and therefore handles much better.
2. Makes more horse power.
3. Is much more fuel efficient.
That's enough, I don't want to rub it in. BTW I owned a 1970 with the 454 so I know exactly what I am not missing.
1. Much lighter and therefore handles much better.
2. Makes more horse power.
3. Is much more fuel efficient.
That's enough, I don't want to rub it in. BTW I owned a 1970 with the 454 so I know exactly what I am not missing.
CF Community Team
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From: Charlotte N.C.
Burning Brakes
Joined: Feb 2005
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From: Branford Connecticut
In this context, the 402 is a bored (or honed) and stroked LS2.
Stock LS2 bore and stroke is 4.000" x 3.622" (364 c.i.d.).
The 402 bore and stroke is 4.030" x 4.000".
The 1970 big block 402 bore and stroke is 4.125" x 3.760".
The 427 LS7 bore and stroke is 4.125" x 4.000".
The 1965-1969 big block 427 bore and stroke is 4.251" x 3.760".
IMO, none of these engines can really be considered "Small Block Chevrolet" engines. THe only thing the LS engines share with the 1955 - 1996 small block is the dimension between the bore centers. All of the internals, and externals, are completely different.
Stock LS2 bore and stroke is 4.000" x 3.622" (364 c.i.d.).
The 402 bore and stroke is 4.030" x 4.000".
The 1970 big block 402 bore and stroke is 4.125" x 3.760".
The 427 LS7 bore and stroke is 4.125" x 4.000".
The 1965-1969 big block 427 bore and stroke is 4.251" x 3.760".
IMO, none of these engines can really be considered "Small Block Chevrolet" engines. THe only thing the LS engines share with the 1955 - 1996 small block is the dimension between the bore centers. All of the internals, and externals, are completely different.
Burning Brakes
Joined: Jul 2007
Posts: 1,165
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From: Halcottsville NY
Does anybody remember the S.B. 400's from the early 70's? I dropped one in my 63' SWC. I had the flywheel balanced and added a highrise manifold with an 850 dp on top of two humped 2.02 heads. That Vette really screamed. Nobody believed, that, the internals were stock. The power curve really came on at about 3K.
Melting Slicks
Joined: Oct 2005
Posts: 2,515
Likes: 3
From: Goleta California
In this context, the 402 is a bored (or honed) and stroked LS2.
Stock LS2 bore and stroke is 4.000" x 3.622" (364 c.i.d.).
The 402 bore and stroke is 4.030" x 4.000".
The 1970 big block 402 bore and stroke is 4.125" x 3.760".
The 427 LS7 bore and stroke is 4.125" x 4.000".
The 1965-1969 big block 427 bore and stroke is 4.251" x 3.760".
IMO, none of these engines can really be considered "Small Block Chevrolet" engines.
THe only thing the LS engines share with the 1955 - 1996 small block is the dimension between the bore centers. All of the internals, and externals, are completely different.
Stock LS2 bore and stroke is 4.000" x 3.622" (364 c.i.d.).
The 402 bore and stroke is 4.030" x 4.000".
The 1970 big block 402 bore and stroke is 4.125" x 3.760".
The 427 LS7 bore and stroke is 4.125" x 4.000".
The 1965-1969 big block 427 bore and stroke is 4.251" x 3.760".
IMO, none of these engines can really be considered "Small Block Chevrolet" engines.
THe only thing the LS engines share with the 1955 - 1996 small block is the dimension between the bore centers. All of the internals, and externals, are completely different.