Comment by mulmen

> I'm sure you could still get one, but who would when you could get something better on the lot for the same money.

It was almost certainly cheaper to get the small block and if that's all you need why spend more to burn more gas? The 1988 GM Medium Duty Truck brochure lists the 5.7L (350CID) V8 and SM-465 as standard equipment. I have no idea what the sales numbers were but it's not far fetched for a 1988 truck to have been configured with a small block and a 4 speed from the factory.

https://xr793.com/wp-content/uploads/2020/02/1988-GMC-Medium...