A 37 block #838101, (Pictured above), has dipstick and oil filler on right, serial number by fuel pump, and two bolts hold the Ignition distributor on. 38 block #838710, has Serial number by two bolt Dist, where it stayed on 6 cylinder engines to the end of production of 7-main engines in the early 90's.
Chevy Inline 6 Engine Numbers Decode
The block casting number is: 348675 (250ci between 1973 and 1976)
The numbers on the stamp-pad behind the distributor are:
F0624TAB = engine serial number.
T4F728072 = engine 'vin'.
Thanks for any help.
In the Stovebolt Gallery
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New I-Series Economy Models
In 1964 GMC offered the Chevrolet 230 inline six engine, it brought economy, efficiency & low
initial cost to the line duty trucking industry. The time-proved 6-cylinder engine is a product
of GMC Truck & Coach Division's 50 years of truck engine design experience combined with the
vast resources of General Motors Research & Testing Laboratories. These engines are the same
used in Chevrolet Trucks & GMC Handi-vans. Also these are the same engine used in Canadian
Chevy & GMC trucks. But what was the real reason GMC Used these engines in their trucks?
Here it is, straight form the 'Confidential Information For GMC Salesman Only' book.
Light-duty trucks with an in-line six cylinder engine, known as the 'I-Series', constitute an
important expansion of the 1964 truck line. These new models give you a two-way approach toward
additional sale in the light-dut market:
1. You now have light-duty models that are priced to compete with other leading makes, and
2. With additional floor traffic created by interent in a new, lower-priced GMC, you should
increase your sales of V6 powered light truck by stepping up some prospects, the same as
competition moves then up from in-line six to V8. And remember, your V6 is exclusive
Chevy Six Cylinder Engine Codes
only GMC has it!
The Chevrolet 250 L6 engines also offered in GMC Trucks, this one in 1966 it both the States
& Canada. Here is a list of Inline Six Cylinder Engines used in GMC Trucks in the 1960s:
194 cid, 235 cid, 250 cid, 261 cid, 270 cid, 302 cid.
There was also a 153 cid inline four used in the Handi-Van.
Inline 6 Engine Specifications
Gross Horsepower | Net Horsepower | Gross Torque lbs. ft. | Net Torque lbs. ft. | Bore - Stroke | Displacement | Compression | Notes | |
153 L4 | 90 @ 4000 rpm | 82 @ 4000 rpm | 152 @ 2400 rpm | 144 @ 2000 rpm | 3.875' - 3.25' | 153 cu. in. | 8.5 to 1 | 1, 2 |
120 @ 4400 rpm | 95 @ 4000 rpm | 177 @ 2400 rpm | 155 @ 2000 rpm | 3.56' - 3.25' | 194 cu. in. | 8.5 to 1 | 1, 2 | |
230 L6 | 140 @ 4400 rpm | 115 @ 3600 rpm | 220 @ 1600 rpm | 200 @ 1600 rpm | 3.875' - 2.25' | 230 cu. in. | 8.5 to 1 | 1 |
140 @ 4400 rpm | 120 @ 3600 rpm | 220 @ 1600 rpm | 205 @ 1600 rpm | 3.875' - 2.25' | 230 cu. in. | 8.5 to 1 | 2, 3 | |
250 L6 | 150 @ 4200 rpm | 125 @ 3800 rpm | 235 @ 1600 rpm | 220 @ 1600 rpm | 3.875' - 3.53' | 250 cu. in. | 8.5 to 1 | 2, 4 |
133 @ 3600 rpm | 120 @ 3600 rpm | 244 @ 1300 rpm | 220 @ 1400 rpm | 3.781' - 4.00' | 296.5 cu. in. | 7.75 to 1 | 2, 6 | |
292 L6 | 170 @ 4000 rpm | 153 @ 3600 rpm | 275 @ 1700 rpm | 255 @ 2000 rpm | 3.875' - 4.125' | 292 cu. in. | 8.0 to 1 | 2, 5 |
1. Engines Used in GMC Handi-Van & Handi-Bus.
2. Engines Used in GMC Value Van models.
3. Optional Chevrolet Inline six offered in 1964-1965 series 1000-2500.
4. Optional Chevrolet Inline six offered in 1966 series 1000-2500.
5. Optional Chevrolet Inline six offered in 1966 series 3500-4000.
6. Dry weight less accessories, 586 lbs.
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Information About GMC Truck Drive Trains
Information About GMC Truck Drive Trains
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