GMC motorhome My nephew starts his 73 for the first time in 33 years

Legit, first start since 1991 Just changed oil and made sure the batteries were connected correctly. Cut the fuel line and went direct from a 1 gallon gas can and Viola! What a pleasant surprise.

[@AlainHubert]

Fantastic! Back when GM made good, reliable engines.

[@MrRufffnuttt]

So the high pitch squeal at the end is small leak from air bag controls.
Cleaned up the points, bypassed the fuel tanks to a gas can, changed the oil with mobile 1 full synthetic.
Started right up , was pretty thirsty for gas, couple pumps and it fires up.