Comment by cucumber3732842
10 hours ago
350ish (or less) + 4spd trucks kinda fell out of favor over the course of the 70s for bigger engines and 5spds (usually with a 2spd rear end but I digress). I'm sure you could still get one, but who would when you could get something better on the lot for the same money.
Sounds like someone swapped a 70s-80s engine from a lighter application in.
I don't think that truck would've had manual choke from the factory. Lots of stuff could've happened over the years.
The amount of air your engine breathes is monumental compared to what the smog pump moves. The math of dilution just doesn't work. What does work is pissing a light stream of oxygen (remember, not much of that coming out of the engine, especially on warm up while it runs rich) to help the catalyst burn those hydrocarbons off of itself a wee bit faster.
I'm not sure if an 80s gas MDT would've had cats from the factory.
The 6000 was a commercial truck. It appears to have had a carburetor for most if not all of the 1980s.
> 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...