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SedanMan 02-16-2006 04:12 PM

Preferred GM engine block
 
The GCR lists over 20 different casting numbers that can be used for GM A-Sedan engine blocks. However, if you wanted to order a GM block then it appears that the GM part number that you would order is not the same as the casting number.

My GM parts guy knows of no cross reference that lists which GM block uses which casting number, or which casting number is used to make which GM block part numbers. Yeah, confusing......

So for those that have been through this before:

1) Does anyone know of a cross reference between GM block casting numbers and part numbers?

2) Does anyone have a recommendation as to which part number to order if a person wanted to get a new block? (and why)

Thanks for any insight or recommendations.

t4wallace 02-16-2006 04:49 PM

I have forwarded your question to somebody that might at least have a clue how to answer this question.

I will forward an answer, unless one of the experts around here gets to it faster.

Go with the one that gets you to 383 (displacement, not HP).

Sorry, hadn't stirred the HP pot in a while...

TW

SedanMan 02-16-2006 04:54 PM

Quote:

Originally Posted by t4wallace
Go with the one that gets you to 383 (displacement, not HP).
TW

I currently have a 427.....why would I want to downsize? :D

jimwheeler 02-16-2006 05:13 PM

Jeff Kopp is the resident GM Parts Guru. What say you, Oh Great Parts One?

t4wallace 02-16-2006 05:19 PM

Quote:

Originally Posted by SedanMan
I currently have a 427.....why would I want to downsize? :D

Fuel economy

SedanMan 02-16-2006 05:48 PM

Quote:

Originally Posted by t4wallace
Fuel economy

Um, that's a non-issue as I'm using fuel injection (cleverly hidden inside what looks like a carburetor). It's leaned out to pre-hole-in-piston leanness. Plus, the computer is programmed to shut off some injectors when in 'coast mode' and most of them when in 'deceleration mode'. I typically use about 4 gallons of fuel for a National race but just to be conservative I've mounted a 5 gallon fuel cell....just in case.

kbsmith1 02-17-2006 02:12 AM

engine blocks for GM
 
My understanding is that 76-79 305 engine blocks are somewhat preferred
and that in this range there are also some 4 bolt blocks, as well as some
high nickel blocks that are marked 010 or 020 under the timing cover. It seems like those would be pretty desirable.

I have some pictures of one of these 4 bolt 305 010 blocks that I ran
across that came out of a 77 camaro, and has a legal AS casting
number 361979.

SedanMan 02-17-2006 02:51 AM

needle in a haystack
 
I wonder how a person could go about finding one of those blocks. You said you ran across one. How/where?

Also, I presume this is a 2-piece rear main seal?

Thanks.

Talladega 02-17-2006 03:33 AM

Were you been ,, GTO building,,, weres mine.
 
Quote:

Originally Posted by t4wallace
Fuel economy

NO WONDER YOU NEEDED THAT BIG CARB,,,LOL
LUV YA \ TOM AND THE WALLACE GANG

DAM GUYS WERE THE ONLY ONES THAT WOULD SELL ME A STARTER
AT M/O
WHEN ALL THE OTHERS TOLD ME TO POUND SAND,,,

HEY,,,,, LIFE IS SHORT,,,,
HAVE DAD GET A HOLD OF JOSH AUDEN IN R&D,,,, DAD NEEDS SOMEONE LIKE THAT, GOOD GM KID. AND TEAM PLAYER, LOVES GLASS
REALLY TOM.

TALLADEGA.

Talladega 02-17-2006 04:19 AM

You Do?
 
Mr Smith,
That doesn't talk to me,, no biggie ,im a dick,from adhoc.
But good block to use is a 203, and that was 80-85 2 piece seal.
201,202 blocks are ..o5o thiner in wall thickness,

If you use a 1 piece ,, don;t no shit what to use,

in 1978 GM was in the gas war to econimize cid, so they cast a 4 bolt from
the 010 block,,,
the # KS is talking about , all blockes have that cast in the frt next to the
cam housing,has something to do with centering the cam for core shift,
and next to the 010 020 030 is a dot to the lower corner, tha describes
core shift and centering of cam to the crak.

Don't beat me up becouse someone proves me wrong, im sharing what i no.

IDO have a 305, 4 bolt made in 1979.
came in buick lesabers,regals,montys, and had a code ,,, im in fla so i can't
give you the exzact # now.
But they were going to be used to replace the 010 4 bolt 350s
becouse of the gas wars, in 79=80 and GM found out ,, we want 350 s
and the price of gas or people delt with it.

the block i got was a 4 bolt with legal cast #s. looks almost like a 010
with a sleeve cast in it,,,,
the walls are if i remember wright and i do have them wrote down from
the 201-203 diff in blocks
the 203 m
had the best normal thickness of all the 2 bolt blocks 203s were used 83-85
gm trks.
and had a .120 wall in it, the 201 i have is right around .090 -.110
the 4 bolt that was made in canada is 130 thick,,, don't seem like alot,,
but is.

the webbing on the 4 bolt is thicker than anyone i ever saw, as is the cyl
walls,,,
when i get home i can tell you the stamp # on the pad, if you don't no what i mean by that,,, don't bother looking,,,,,,

See after the gas crunch, 305 were chucked, but they used the mold till
it wore out mostly in vans,boats,,, till the mold shit.

Best way to find one? most blowed up,wore out and they stuck 350s back in
and the scraper got the 4 bolt 305s.

Go to the bone yard if they didn't bary the 305s yet and open the side of the pan up with a chizel, see if it is a 4 bolt,,,
But im going to have to send you the codes,off the pad,
tells were whenwhat, it was put in and when and were it was build,,,

I still need a big cam to twise it to were the fords are at, only problemo is
head flow,,,,fked again,,,,got one that will twist and hold together,
but no flow,,, HUMMM, nut thing i think ,, 'wheel',,,,,lol

I tend to write at night when im tired so i don't last long,,

I'll send Wheel the pic of my motor as a bare block casting # and were to find one
Think most are gone,,,
But once you find one,, you no what to look for,,,, but were do you start??

Alright,, who is incharge of the blender,,,, and it better not be,,,,,,,
hey im in FtL now, seen all these train cars co by filt to the hilt with sand
big name Hurzog on the side,,,,, whats that all about,,,, :eek:


How we doing wheel,,,
Been throwed off better sites,,
Hell 50 bucks on the L nut,,,, :D

T



My understanding is that 76-79 305 engine blocks are somewhat preferred
and that in this range there are also some 4 bolt blocks, as well as some
high nickel blocks that are marked 010 or 020 under the timing cover. It seems like those would be pretty desirable.

I have some pictures of one of these 4 bolt 305 010 blocks that I ran
across that came out of a 77 camaro, and has a legal AS casting
number 361979.[/QUOTE]


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