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probably a th350.
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My 1972 SS with a 350 gets about 16/17 mpg
Yes
A 350 CID w/2bbl carb will get you the best mileage and power.
You probably need to be a bit more specific. I've got a 1972 El Camino with a 350 engine in it. I get about 17 mpg now that I just put new spark plugs and wires in it.
Probably. 9 years ago, I put a new 350 crate engine into my 1979 El Camino, which was originally equipped with a 305. Bolted in and re-used all ancillary components, including carb and intake. Still running.
K&N air filter is the best way
yes, all you need to do is change the motor mounts and put in a bigger radiator.
350 c.i.d.
The only 350 available in a 1984 El Camino was the diesel. If your V8 isn't a diesel, it's a 305.
i have a Chevy 350 small block with headers.It is terrible on rgas .What can i do to improve fuel efficiency.Also very strong smell of gas at idle and extreme when accelerating.