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there could be any of at least three engines in that vehicle. The first and probably most likely is a v6 which i believe is a 4.3L, The second is a V8 305 or 5.0L and the third is a v8 350 or 5.7L. There is also the possibility of the 454 but it is unlikely you wouldn't know that's what you had. If someone has modified the engine it could be a 383 stroker. But I wouldn't get my hopes up. Count the spark plug wires. If it has 6 its a v6 if it has 8 its a v8.
Even better if you radiator shroud is intact and the stickers are still on it, it should say what size engine came with the truck.
What else can I help you with?
Release tension on 1991 C1500 serpentine belt?
how to release serpentine belt tensioner on 1991 C1500 Chevy Silverado?
I want to put a GMC grill on my 1991 C1500 Chevy. Is that possible?
Yes I bought a chevy c1500 with a gmc grill already on it
Horsepower of a 1991 5.7l V8 C1500 Chevy?
It has 255 H.P.
What is the spark plug gap on a 1996 Chevy C1500 Pickup with a 305 V8 engine?
The recommended spark plug gap on a 1996 Chevy C1500 with a V8-305 engine is .060"
What is the horse power in a stock 1991 Chevy C1500?
about 190 at the wheels. (350ci)
What Type Of Transmission Came In the 1991 Chevy C1500 2WD?
700r4 automatic
How do you change headlight on 1991 Chevy c1500?
You remove grill to remove and replace the headlights.
What type of 350 engine is in the 1994 c1500 Chevy truck?
350 tbi
What is the correct spark plug gap on a 95 Chevy C1500 with 305 engine?
0.035
Is the windshield from a 79 Chevy c1500 compatible with a 94 Chevy c1500?
NO not even close.
Why is the water not circulating in your 1995 Chevy c1500 truck?
Why is the water not circulating in my 1995 C1500 Chevy truck?
Where is a thermostat located on a 1993 Chevy C1500?
Should be in a removable housing at the engine end of the upper radiator hose
