8-400 badge...what exactly does it mean? - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**tkeduk8r** · 10-03-2010, 09:37 PM

doesnt look to bad.... hey where abouts in tonka do you live??? I went to Deephaven and Groveland elementary schools when we lived off of carson's bay as a kid.... my dad grew up in excelsior and my wife and I still hang out there occasionally...
--Mike

05crewcab · 10-03-2010, 10:38 PM

so, might not have gotten the greatest deal afterall...

I cleaned the engine up tonight and found the casting number and engine VIN

casting # 3999289

Engine VIN T1025TRB

This block is a 454

Now, there is no partial vehicle VIN stamped near the engine VIN. Could this be a warranty replacement block?

And if so, did they usually replace the engines with what was current, or did they replace with year correct blocks?

I read somewhere that sometimes blocks with this casting number were actually bored for 402ci...

I'll know more tomorrow when I pull a valve cover and get the head casting numbers.

I'm a little disappointed, but what the hell, it's still a big block

05crewcab · 10-03-2010, 10:59 PM

Quote:

Originally Posted by tkeduk8r

doesnt look to bad.... hey where abouts in tonka do you live??? I went to Deephaven and Groveland elementary schools when we lived off of carson's bay as a kid.... my dad grew up in excelsior and my wife and I still hang out there occasionally...
--Mike

I'm just south of Ridgedale now, and grew up in the Glen Lake area of Minnetonka (Hopkins Schools)

I wish I had a big lake in my back yard!

**too much stuff** · 10-03-2010, 11:23 PM

I doubt it is a warranty block. Still a 454 however. Does it run and drive yet?

05crewcab · 10-04-2010, 12:04 AM

Not running and driving yet...dang, I've only had it for 30 hours

I'll get it going this week hopefully. Stay tuned!

05crewcab · 10-04-2010, 09:53 PM

So, got the head numbers today and found that they are different castings:

353049 1-18-72

and

3993820 F-10-71

Is it odd to have two different casting number heads on one block?

raycow · 10-04-2010, 10:14 PM

Quote:

Originally Posted by 05crewcab

Is it odd to have two different casting number heads on one block?

It is very likely that one of those heads has been replaced. Look at the difference in casting dates - over 7 months.

Ray

05crewcab · 10-04-2010, 10:21 PM

Does it matter for the engine if the castings are different?? I read that those two castings numbers are similar designs, similar CC's, etc... It's fine to run them together isn't it?

05crewcab · 10-05-2010, 09:36 PM

Got it running! sort of... It'll run if I dump gas in the carb, but it won't run on it's own fuel supply. I probably have to fiddle with the carb and fuel lines...must not have cleaned all the crap out of it.

I'll have more time tomorrow night to try it again.

raycow · 10-05-2010, 11:51 PM

Quote:

Originally Posted by 05crewcab

I read that those two castings numbers are similar designs, similar CC's, etc... It's fine to run them together isn't it?

Combustion chamber volume is the most important match, but you want the valves and ports to be similar too.

Ray

05crewcab · 10-10-2010, 01:29 AM

It's alive! I had to replace most of the rubber fuel lines, fuel pump, and rebuilt the carb. now she purrs like a kitten

nothing sounds wrong with the motor except a giant exhaust leak which I will fix tomorrow.

I think I did pretty good with this purchase...the trans even shifts smoothly

Rodk65 · 10-11-2010, 10:59 AM

Congratulations on bringing it back to life. I'm glad someone made the road trip up north to get it. I would have went to look at it, but I still have a truck at Sharpies place in Wyoming I have to pick up.

Keith Seymore · 10-11-2010, 11:02 AM

Quote:

Originally Posted by 05crewcab

more...

Ooh. I like your "tow truck"...

05crewcab · 10-11-2010, 11:25 AM

Quote:

Originally Posted by Keith Seymore

Ooh. I like your "tow truck"...

Thanks! I love my Crew Cab

6 years old and nearly 80K miles on it and the only thing that stinks is the hydroboost unit leaks. I LOVE the diesel...towing that truck back home I got 16.5 mpg

side note- we had two 88-98 C/K's make it to 300K miles...and I plan on driving this one forever. great trucks!

how much of a hand did you have in engineering those bad boys?

Keith Seymore · 10-11-2010, 01:24 PM

Quote:

Originally Posted by 05crewcab

Thanks! I love my Crew Cab

6 years old and nearly 80K miles on it and the only thing that stinks is the hydroboost unit leaks. I LOVE the diesel...towing that truck back home I got 16.5 mpg

side note- we had two 88-98 C/K's make it to 300K miles...and I plan on driving this one forever. great trucks!

how much of a hand did you have in engineering those bad boys?

For GMT400 I was in driveline development and later brake development.

I did the engine air induction system for the GMT800's.

After that I moved into engineering program management, and did the GMT820D and GMT820C (the Denali and Escalade), the 2003 pickup midcycle, then the H2 and now the Volt.

K

05crewcab · 10-11-2010, 10:53 PM

Quote:

Originally Posted by Keith Seymore

For GMT400 I was in driveline development and later brake development.

I did the engine air induction system for the GMT800's.

After that I moved into engineering program management, and did the GMT820D and GMT820C (the Denali and Escalade), the 2003 pickup midcycle, then the H2 and now the Volt.

K

That's pretty cool Keith. Thanks for helping develop two of the BEST series of trucks ever made!

Robert Martin · 06-22-2017, 06:48 PM

Quote:

Originally Posted by shiner2001

I'm new around here, but I'm pretty sure that the screw in the upper part of the door, just below the vent window handle tells you it's a 72. Obviously, that's assuming it's all original, but it's a start. Someone correct me if I'm wrong on that one...

Correct

Robert Martin · 06-22-2017, 06:54 PM

Quote:

Originally Posted by 05crewcab

Just want to make sure of something. the 8-400 badge came out in 71 for the big block trucks even though they were infact 402ci, and, eventhough the '70 trucks were 402's, they still got the 8-396 badge correct?

And, the small block 400 was never offered in the pre-'73 trucks, true?

I ask because I might buy this truck below (for the motor and tranny, and onl y if I can get it cheaper) and can't quite make out the size of the motor in the pic, and I think it is a '72, not a '70:

http://minneapolis.craigslist.org/hn...955810491.html

if I'm not correct please correct me... the 8/400 was a 396ci bored out .30 over which made it a 402. That's why all 3 tags read differently 396 400 and 402. I think I'm partially right...

**71CHEVYSHORTBED402** · 06-22-2017, 08:04 PM

Feel free to correct, but there's no rhyme or reason for it. They did this to confuse the enthusiasts.

The SPID reads 400 CI. but it's 402 CI.

The emissions sticker reads 402 CI.

They probably figured 400 badges look cooler.

I can't really say they were wrong.

The owners manual calls it a 400 engine and 402 piston displacement.

A 396 SPID may actually have a 402 engine, yikes, I mean displacement. The same may apply for a 396 badge.

Can't speak for how much a 402 is punched out, but I can say it doesn't mean more HP. While I can't speak for years, the heads on at least some 396 engines had larger ports than at least some 402 engines. 10.1 compression versus 8.5/1. That's how I remember it anyway.

hdff · 06-22-2017, 08:37 PM

Quote:

Originally Posted by Robert Martin

if I'm not correct please correct me... the 8/400 was a 396ci bored out .30 over which made it a 402. That's why all 3 tags read differently 396 400 and 402. I think I'm partially right...

I have never seen a 8 402 badge....

You realize that this thread is 7 years old...

Robert Martin · 06-23-2017, 07:25 AM

Quote:

Originally Posted by hdff

I have never seen a 8 402 badge....

You realize that this thread is 7 years old...

actually...no I didn't realize it was 7 yrs old! Lol... I'm way behind! 🤣

**70cst** · 06-23-2017, 08:15 AM

Loos like a good purchase to me ...

schovil69 · 06-23-2017, 10:10 AM

So, seven years have passed. How 'bout an update on this truck?

Keith Seymore · 06-23-2017, 12:17 PM

Quote:

Originally Posted by 05crewcab

more...

Ooh. I like your black truck...

Keith Seymore · 06-23-2017, 12:21 PM

Quote:

Originally Posted by Keith Seymore

Post #38: Ooh. I like your "tow truck"...

LOL! At least I am consistent. 7 years....

K

10-03-2010, 09:37 PM	#26
tkeduk8r Senior Member Join Date: Apr 2001 Location: Alexandria, MN Posts: 1,462	Re: 8-400 badge...what exactly does it mean? doesnt look to bad.... hey where abouts in tonka do you live??? I went to Deephaven and Groveland elementary schools when we lived off of carson's bay as a kid.... my dad grew up in excelsior and my wife and I still hang out there occasionally... --Mike __________________ 63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's

10-03-2010, 10:38 PM	#27
05crewcab Registered User Join Date: Mar 2010 Location: Minnetonka, MN Posts: 409	Re: 8-400 badge...what exactly does it mean? so, might not have gotten the greatest deal afterall... I cleaned the engine up tonight and found the casting number and engine VIN casting # 3999289 Engine VIN T1025TRB This block is a 454 Now, there is no partial vehicle VIN stamped near the engine VIN. Could this be a warranty replacement block? And if so, did they usually replace the engines with what was current, or did they replace with year correct blocks? I read somewhere that sometimes blocks with this casting number were actually bored for 402ci... I'll know more tomorrow when I pull a valve cover and get the head casting numbers. I'm a little disappointed, but what the hell, it's still a big block __________________ 1971 C-20 350/350

10-03-2010, 11:23 PM	#29
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,712	Re: 8-400 badge...what exactly does it mean? I doubt it is a warranty block. Still a 454 however. Does it run and drive yet? __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

10-04-2010, 12:04 AM	#30
05crewcab Registered User Join Date: Mar 2010 Location: Minnetonka, MN Posts: 409	Re: 8-400 badge...what exactly does it mean? Not running and driving yet...dang, I've only had it for 30 hours I'll get it going this week hopefully. Stay tuned! __________________ 1971 C-20 350/350

10-04-2010, 09:53 PM	#31
05crewcab Registered User Join Date: Mar 2010 Location: Minnetonka, MN Posts: 409	Re: 8-400 badge...what exactly does it mean? So, got the head numbers today and found that they are different castings: 353049 1-18-72 and 3993820 F-10-71 Is it odd to have two different casting number heads on one block? __________________ 1971 C-20 350/350

10-04-2010, 10:21 PM	#33
05crewcab Registered User Join Date: Mar 2010 Location: Minnetonka, MN Posts: 409	Re: 8-400 badge...what exactly does it mean? Does it matter for the engine if the castings are different?? I read that those two castings numbers are similar designs, similar CC's, etc... It's fine to run them together isn't it? __________________ 1971 C-20 350/350

10-05-2010, 09:36 PM	#34
05crewcab Registered User Join Date: Mar 2010 Location: Minnetonka, MN Posts: 409	Re: 8-400 badge...what exactly does it mean? Got it running! sort of... It'll run if I dump gas in the carb, but it won't run on it's own fuel supply. I probably have to fiddle with the carb and fuel lines...must not have cleaned all the crap out of it. I'll have more time tomorrow night to try it again. __________________ 1971 C-20 350/350

10-10-2010, 01:29 AM	#36
05crewcab Registered User Join Date: Mar 2010 Location: Minnetonka, MN Posts: 409	Re: 8-400 badge...what exactly does it mean? It's alive! I had to replace most of the rubber fuel lines, fuel pump, and rebuilt the carb. now she purrs like a kitten nothing sounds wrong with the motor except a giant exhaust leak which I will fix tomorrow. I think I did pretty good with this purchase...the trans even shifts smoothly __________________ 1971 C-20 350/350

10-11-2010, 10:59 AM	#37
Rodk65 Registered User Join Date: Apr 2010 Location: Holmen, WI Posts: 212	Re: 8-400 badge...what exactly does it mean? Congratulations on bringing it back to life. I'm glad someone made the road trip up north to get it. I would have went to look at it, but I still have a truck at Sharpies place in Wyoming I have to pick up. __________________ ROD 1969 K10 4x4 Short Fleet. Tuned Port Injection 350/700R4, Cruise, tilt and factory A/C. 1971 C20 Camper Special. 350/350. SOLD 2002 Chevy Tahoe LT Last edited by Rodk65; 10-12-2010 at 09:00 AM.

06-22-2017, 08:04 PM	#44
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,189	Re: 8-400 badge...what exactly does it mean? Feel free to correct, but there's no rhyme or reason for it. They did this to confuse the enthusiasts. The SPID reads 400 CI. but it's 402 CI. The emissions sticker reads 402 CI. They probably figured 400 badges look cooler. I can't really say they were wrong. The owners manual calls it a 400 engine and 402 piston displacement. A 396 SPID may actually have a 402 engine, yikes, I mean displacement. The same may apply for a 396 badge. Can't speak for how much a 402 is punched out, but I can say it doesn't mean more HP. While I can't speak for years, the heads on at least some 396 engines had larger ports than at least some 402 engines. 10.1 compression versus 8.5/1. That's how I remember it anyway. __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025

06-23-2017, 08:15 AM	#47
70cst Senior Member Join Date: Feb 2001 Location: New Madison, Ohio Posts: 21,365	Re: 8-400 badge...what exactly does it mean? Loos like a good purchase to me ... __________________ A husband can be right...or...A husband can be happy. 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder!

06-23-2017, 10:10 AM	#48
schovil69 Registered User Join Date: Oct 2013 Location: Lincoln, NE Posts: 115	Re: 8-400 badge...what exactly does it mean? So, seven years have passed. How 'bout an update on this truck?

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