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Username Post: small block identification        (Topic#254537)
Forum Newbie
Posts: 4

Reg: 12-18-10
12-18-10 05:09 PM - Post#2019939    

I need help identifing a chevy 350. The rear of block is stamped 5.7 LG SGI. The front plate near the passenger side head where the numbers are usually found is smooth. The only numbers I have located so far are, 638 located on the lower block side above the motor mounts. and near the oil filter stamped 183551 (I think). Intake is off an older motor and marked 1968. Any help would be great. Thanks.

C10 Sleeper 
Valued Contributor
Posts: 3426
C10 Sleeper
Loc: Redding Ca
Reg: 03-17-09
12-18-10 06:52 PM - Post#2019982    
    In response to 62Impala350

That is a 350 that was used from 1987 to 1995, It could be a 2 bolt or 4 bolt main.

Forum Newbie
Posts: 4

Reg: 12-18-10
12-18-10 07:34 PM - Post#2020004    
    In response to C10 Sleeper

Thanks for your help, that's a good start.

Forum Newbie
Posts: 4

Reg: 12-18-10
12-19-10 10:15 AM - Post#2020179    
    In response to 62Impala350


I am on the same quest. Here is the information I have found. Since you don’t have stamped numbers on the milled block head deck my research tells me this could mean the block head deck could have had work done to it where the head deck was machined to increase compression or some other reason. However, if you have stamped numbers on the machined head deck surface in the rear driver’s corner above the oil filter my guess and only my guess the deck has not been machined or this number would have machined off as well. I have read of “Crate” engines and “Short Blocks” that don’t have the numbers stamped you would find from an engine installed in the factory.

I’m thinking you may be able to find basic block information from the top of the block bell housing flange. My 350 block has the cubic inch (5.7LG SGI), the date the block was cast in a coded number, and the block casting number for the style of block.

So here is what I have found for my 350 block. Some may apply to yours and what doesn’t may point you in a direction to figure out your block information.

5.7 LG = 5.7 Liters Gross
SGI = Spherodial Graphite Iron = (Note: this is the type of iron that the block is made of) Ductile or spheroidal graphite irons: These irons have higher mechanical properties than a comparable grey cast iron with the same composition, because the carbon is in the shape of spheroidal graphite.

Engine Casting: 14093638 (this casting number block made 1988 through 1994
14093638 = 350 cubic inch
• 1988 through 1994 were the years this block was made
• Roller or Flat Tappet Cam was used
• 2 or 4 bolt mains were used
• 1-piece rear seal

Date: code on block: D114 (this translates to April 11, 1994)
D114 = April 11, 1994
D = month being A=Jan, B=Feb, C=March, D=April, and so on
11= day of month block casting was cast or made
4 = the last digit of the year block was made and since this block was made from 1988 through 1994 in this case the “4” means the year 1994

Engine Number: CRF524826 (I'm not sure what this number is)
Head Casting:
[b]Block Number: 638
Engine Suffix Code: V0414FWB (could this be FWA)
V = Flint Plant ( I confirmed the block was made at the Flint plant)
04 = Month number was stamped
14 = Day of month number was stamped
• F = this might mean car but I am not sure
• WB = ???? does this mean 350? I don’t know
FWB = Engine Type - - - I have not been able to find this “Engine Type” code however on the internet I did find FWA so I have to double check the block and check if I copied it wrong.

FWA = CID 350, HP 210, RPO L-05, TBI, Truck, 4x4
This information was found at:

Number Location I Found On Block

Directly above Oil Filter: 627 N

Rear of Block Bell Housing Flange Driver’s Side: 8
GM 5.7 LG 3

Rear of Block Bell Housing Flange Driver’s side D114

Rear of Block Bell Housing Flange Passenger Side: 14093638

On Side and Front of Block: 638

Milled Surface at Rear Driver’s Side Above Oil Filter: CRF524826

Milled Surface on Front of Block Passenger Side Where Head Bolts On: VO414FWB

Web sites of interest for researching engine numbers and specifications:
look at: chevy small block identification codes
then look at: suffix codes odecoding

Hope this helps, verify everything for yourself as I may have made a mistake here. I’m in the same boat as you trying to figure this out.

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