Mr S
Posted a lot
10-4 Good buddy.
Posts: 2,654
|
|
|
|
In my '75 K5 Blazer, I have what I believe to be a 400 cubic inch (6.6 litre) engine. However, the original engine was a 350 (5.7) (according to some online VIN PDF type thingies) Where on the engine can I look for indicators/numbers/casting marks as to the year and (suggested) power output of the lump, and even to confirm that it is a 400 and not a 350? Intake manifold is aftermarket, as is the carb (both Edelbrock), so it's not definitely not standard in there. But as I'm slowly working through getting it road-ready again, it'd be nice to know - not to mention for ordering any bits I may need for it! I could google, but there is loads of conflicting information out there, and I know there are plenty of knowledgeable sorts on here  Cheers and a Happy New Year to you all - personally I'm glad to see the back of 2016 and hope 2017 will be far, far better! |
| |
Last Edit: Jan 2, 2017 12:43:51 GMT by Mr S
Suzuki GSXR1000 K2
BMW R1150GS
BMW K1200RS
Chevy K5 Blazer
Chevy Suburban LT
Jaguar XKR
|
|
|
|
|
|
|
|
measure the stroke, welding rod or similar down the plug hole.
350 is 3.48" stroke and the 400 is 3.75".
|
| |
|
|
|
|
|
|
|
The block casting number should be behind the drivers side cylinder head. List of casting numbers are on the mortec website: www.mortec.com/castnum.htmThere is also links on there to explain where all the casting numbers are (heads and block). Cheers Sean |
| |
|
|
mk2cossie
Club Retro Rides Member
Posts: 2,954 
Club RR Member Number: 77
|
Chevy V8 identificationmk2cossie
@mk2cossie
Club Retro Rides Member 77
|
|
|
If it's a Chevy lump, would it not be a big block at 6.6l? If so, they are physically bigger than a 5.7l small block  Bung a pic up of it and see what the general concensus on here is  |
| |
|
|
|
|
|
|
|
If it's a Chevy lump, would it not be a big block at 6.6l? If so, they are physically bigger than a 5.7l small block Bung a pic up of it and see what the general concensus on here is Not necessarily. Chevy did do a 400 small block, which is what Mr S thinks he has in his car. The 400 small block had its own block with siamesed cylinders to allow the increase in bore. Stroke was also increased from a 350. But from the outside they look pretty much identical to 350. The big blocks actually started out as low as 366ci, so quite a big overlap in capacity with the small blocks. Confusingly, the 396 big block that you are thinking of were actually 402ci from 1970 onwards! Cheers Sean |
| |
|
|
Mr S
Posted a lot
10-4 Good buddy.
Posts: 2,654
|
|
|
|
|
|
| |
Suzuki GSXR1000 K2
BMW R1150GS
BMW K1200RS
Chevy K5 Blazer
Chevy Suburban LT
Jaguar XKR
|
|
Paul Y
Posted a lot
Posts: 1,948
|
|
|
|
on a SBC there are a 2 sets of numbers, the easiest, and most informative provided the block has not been decked, are on the fron left hand side of the engine. Where the head bolts to the block there is a 1/4" of deck surface protruding past the head. Use this site to decode the letters and numbers www.nastyz28.com/chevy-engine-code-stampings.php#suffixThe harder set to read are on the back of the block, right hand side ( all looking from the front) Decode these numbers here outintheshop.com/faq/casting/castings2.htmlLet us know what you have.. P. |
| |
|
|
Mr S
Posted a lot
10-4 Good buddy.
Posts: 2,654
|
|
|
|
The engine code has the suffix CSA, so that makes it either a 1973 or 1976 400 small block, so it is what I thought what it is! Given that the truck is a 1975, I would suspect the former and that it is in fact the original engine. Must re-check the VIN... Could do with a clean and paint!    |
| |
Suzuki GSXR1000 K2
BMW R1150GS
BMW K1200RS
Chevy K5 Blazer
Chevy Suburban LT
Jaguar XKR
|
|
Mr S
Posted a lot
10-4 Good buddy.
Posts: 2,654
|
|
|
|
And thanks for the help and links |
| |
Suzuki GSXR1000 K2
BMW R1150GS
BMW K1200RS
Chevy K5 Blazer
Chevy Suburban LT
Jaguar XKR
|
|
.jpg)
