1994 GMC C1500 305 or 350?

Asked by GuruBVTC6 Jan 02, 2019 at 06:55 PM about the 1994 GMC Sierra 1500 C1500 SL Extended Cab SB

Question type: General

So I just bought a 1994 GMC truck. It's a C/k1500 in great shape with
126,000 miles showing on the speedo. The sticker on the radiator says it's a
5.7l engine. Great. But now that I got it home and ran the vin it says it's a 5.0.
It has a salvage title but again it's in great shape and at first I wasn't
concerned but now I'm suspicious. I'm not interested in a project truck with a
305 in it.
Vin 2GTEC19H7R1502730
Is there another way to ID the engine?

3 Answers
103,185

KenF answered 5 years ago

You can ID a GM engine through the casting numbers on the block, heads, and intake. Just Google your casting numbers, there are tons of web sites out there that compile this info.

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43,910

Hornet_2497 answered 5 years ago

The engine VIN is located near the rear of the block on the driver's side. It's a nine digit number and the eighth digit identifies the engine displacement. Code "H" is the 5.0 liter. Code "G" is the 5.7 liter. So it came from the factory with a 5.0 engine. Check the engine block casting number hoping to find a "G" for 5.7 liter. Good Luck

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103,185

KenF answered 5 years ago

The serial number from the VIN (the last 6 digits) should also match a stamped number on the block.

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