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choke
04-09-2001, 02:28 PM
I've got a '92 Chevy Silverado (ext cab, step side) and me and a buddy of mine were foolin around with the motor. I've got a blown head gasket (water in the oil)so I was debating on whether of not to screw with it myself or just buy a new motor. He then said something about replacing a 305. I'm no expert, but I was pretty dang sure I had a 350. We argued for a while, and I know it should be obvious and I feel like a moron, but I couldn't prove it wasn't. How do I tell?

[Edited by choke on 04-09-2001 at 01:30 PM]

75
04-09-2001, 06:34 PM
If this is the original engine, then there should be a sticker with emission control/belt routing etc info located under the hood, near the latch. The engine displacement (5.0 litre for a 305, 5.7 litre for a 350) should appear on this sticker. I'm not sure how to go about deciphering it, but there should also be an option code sticker (in the glovebox? - I know that's where it was back in the '70's!) that may tell you the engine it came with.

To determine which engine it is once & for all, find the block casting number. Look on the block, on the top of the flywheel housing and just behind the driver side (1-3-5-7) cylinder head. There is a number cast into the block which will tell you which engine you have. A bit awkward to read with the engine in the truck, but you can do it - a good flashlight helps! It may also be necessary to clean the number off with a wire brush.

Unfortunately, none of the books I have list the numbers past 1986 (since everything I have is old/ancient (depending on what you consider old! :D )) but I'm certain if you get the number off your block & post it here, someone out there will be able to tell you exactly what you have.