1969 chevy cst big block - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Byronl68 · 09-30-2015, 09:46 PM

Can anyone tell me if the 1969 Chevrolet CST big block trucks were labeled with the 400 badges? I read that the later models were labeled with the 400 badges and wanted to know if this is the case. Any insight would be greatly appreciated...

**68bowtie** · 10-01-2015, 02:03 AM

pretty sure it should have been badged as 396 in 1969.

Byronl68 · 10-01-2015, 08:12 AM

Thanks for the reply... I will keep researching. I heard that the some of the later models in 1969 could of been labeled with 400 fender badges.

**too much stuff** · 10-01-2015, 08:15 AM

Quote:

Originally Posted by 68bowtie

pretty sure it should have been badged as 396 in 1969.

I believe this is correct...

Byronl68 · 10-01-2015, 10:03 AM

Thanks for the reply...

**71CHEVYSHORTBED402** · 10-03-2015, 01:49 AM

The 402 was introduced in 1970.

GM was developing the SBC 400, but didn't want a SBC with a larger CU, so they punched out the 396 to 402, and slapped on a 400 emblem to test our limits.

Course that wasn't enough, so on some they slapped on the 400 emblem, SPID read 396, and featured a 402 under the hood, and/or any variation of the three. Make sense?

Byronl68 · 10-05-2015, 05:03 PM

Yes it does.. I am buying this truck and am in the process of verifying it has the number matching motor. I have not seen to many at all with the 400 badge but did read on line that they did label some of the later 69 models with the 400 badge. Can't wait to get it bought

Thanks for your reply

Byronl68

1966 shortbed Big Window A/C truck
1961 Chevy K10 Shortbed fleet side
1962 Chevy K10 Shortbed step side

trac209 · 10-05-2015, 06:04 PM

Quote:

Originally Posted by 71CHEVYSHORTBED402

The 402 was introduced in 1970.

GM was developing the SBC 400, but didn't want a SBC with a larger CU, so they punched out the 396 to 402, and slapped on a 400 emblem to test our limits.

Course that wasn't enough, so on some they slapped on the 400 emblem, SPID read 396, and featured a 402 under the hood, and/or any variation of the three. Make sense?

From what I read they created those to salvage a flaw in a whole bunch of off the assembly line 396 blocks. They were bored over to avoid them being junked.

**71CHEVYSHORTBED402** · 10-05-2015, 09:42 PM

Quote:

Originally Posted by trac209

From what I read they created those to salvage a flaw in a whole bunch of off the assembly line 396 blocks. They were bored over to avoid them being junked.

Makes sense.

Once upon a time, I thought I heard the 396 heads had larger ports and therefore more compression. If I recall, it was 10:1 Vs 8.5/1. The heads on my rebuild came off a 396. Note: I don't know a lot about engines. I just did the R and R, with my buddy who led.

trac209 · 10-05-2015, 10:01 PM

Quote:

Originally Posted by 71CHEVYSHORTBED402

Makes sense.

Once upon a time, I thought I heard the 396 heads had larger ports and therefore more compression. If I recall, it was 10:1 Vs 8.5/1. The heads on my rebuild came off a 396. Note: I don't know a lot about engines. I just did the R and R, with my buddy who led.

Port size doesn't effect compression ratio, that is determined by chamber volume as far as the heads are concerned. But anyhow the 396 -402 trucks are among the coolest IMHO.

68panelman · 10-05-2015, 10:06 PM

Always thought the 402 started in 1971?

Byronl68 · 10-05-2015, 11:19 PM

Thanks for all the input. Im excited to get the truck and appreciate your help in verifying it's correct. This truck is pretty cool. Does anyone know the correct engine code for a 1969 400 block and where on the engine I would find the code?

**71CHEVYSHORTBED402** · 10-07-2015, 03:43 PM

Quote:

Originally Posted by 68panelman

Always thought the 402 started in 1971?

Nope, 1970...........

Big-Block Chevy: Block Casting Identification
Casting No.: Designation: Model year: Notes:

3999290 396 '68-'69 two- or four-bolt, truck
3999290 402 '70-'72 two- or four-bolt, truck

**71CHEVYSHORTBED402** · 10-07-2015, 03:44 PM

Quote:

Originally Posted by trac209

Port size doesn't effect compression ratio, that is determined by chamber volume as far as the heads are concerned. But anyhow the 396 -402 trucks are among the coolest IMHO.

I see. Thank you.

Byronl68 · 10-07-2015, 10:02 PM

Thanks for the reply....

09-30-2015, 09:46 PM	#1
Byronl68 Registered User Join Date: Aug 2012 Location: Rigby Idaho Posts: 13	1969 chevy cst big block Can anyone tell me if the 1969 Chevrolet CST big block trucks were labeled with the 400 badges? I read that the later models were labeled with the 400 badges and wanted to know if this is the case. Any insight would be greatly appreciated...

10-01-2015, 02:03 AM	#2
68bowtie Senior Member Join Date: Jan 2007 Location: Turlock, CA Posts: 8,344	Re: 1969 chevy cst big block pretty sure it should have been badged as 396 in 1969. __________________ I live in California, but identify as a Texan "If a job's worth doing, it's worth doing well" Project "Little Sister" (70 c10 blue original paint refresh) Project "C10 Fever" (68 factory black 396 swb) Project "Blue Bomb" (70 c30 blue original paint refresh) Project "Vitamin C" (71 c10 orange original paint refresh)

10-01-2015, 08:12 AM	#3
Byronl68 Registered User Join Date: Aug 2012 Location: Rigby Idaho Posts: 13	Re: 1969 chevy cst big block Thanks for the reply... I will keep researching. I heard that the some of the later models in 1969 could of been labeled with 400 fender badges.

10-01-2015, 10:03 AM	#5
Byronl68 Registered User Join Date: Aug 2012 Location: Rigby Idaho Posts: 13	Re: 1969 chevy cst big block Thanks for the reply...

10-03-2015, 01:49 AM	#6
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,120	Re: 1969 chevy cst big block The 402 was introduced in 1970. GM was developing the SBC 400, but didn't want a SBC with a larger CU, so they punched out the 396 to 402, and slapped on a 400 emblem to test our limits. Course that wasn't enough, so on some they slapped on the 400 emblem, SPID read 396, and featured a 402 under the hood, and/or any variation of the three. Make sense? __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring it from ground up. With assys, the guide accts for 1000s of OEM identifications and part numbers, all written in short order. 700+ images include assm, illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 10-03-2015 at 02:42 AM.

10-05-2015, 05:03 PM	#7
Byronl68 Registered User Join Date: Aug 2012 Location: Rigby Idaho Posts: 13	Re: 1969 chevy cst big block Yes it does.. I am buying this truck and am in the process of verifying it has the number matching motor. I have not seen to many at all with the 400 badge but did read on line that they did label some of the later 69 models with the 400 badge. Can't wait to get it bought Thanks for your reply Byronl68 1966 shortbed Big Window A/C truck 1961 Chevy K10 Shortbed fleet side 1962 Chevy K10 Shortbed step side

10-05-2015, 10:06 PM	#11
68panelman Registered User Join Date: Jan 2011 Location: Delaware and Long Island, New York Posts: 3,450	Re: 1969 chevy cst big block Always thought the 402 started in 1971?

10-05-2015, 11:19 PM	#12
Byronl68 Registered User Join Date: Aug 2012 Location: Rigby Idaho Posts: 13	Re: 1969 chevy cst big block Thanks for all the input. Im excited to get the truck and appreciate your help in verifying it's correct. This truck is pretty cool. Does anyone know the correct engine code for a 1969 400 block and where on the engine I would find the code?

10-07-2015, 10:02 PM	#15
Byronl68 Registered User Join Date: Aug 2012 Location: Rigby Idaho Posts: 13	Re: 1969 chevy cst big block Thanks for the reply....



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