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You can look at the 8th letter of your vin # if it is a K than you have a 350. i forgot the letter for the 305, but it could have both, even some had a 4.3 V6 You can look at the 8th letter of your vin # if it is a K than you have a 350. i forgot the letter for the 305, but it could have both, even some had a 4.3 V6

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15y ago
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Q: Does a 1990 gmc sierracome a 350 or a 305 engine?
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