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83swb · 10-09-2014, 05:27 PM

Let me begin by saying that both the 305 and 350 share all the same external characteristics, to make it short the 305 is just a smaller displacement 350. As long long as both motors are Gen1 (First generation chevy small block), which they should be considering both trucks are the same vintage, EVERYTHING should be a straight over swap. When I say straight over I mean that with the engines out of both trucks the "new" motor would bolt in the engine bay exactly the same as the other. You may run into very minor issues in the swap, distributors may be a different style requiring that you modify the power and tachometer connections, exhaust manifolds may be different or one may have headers, you may have to modify your fuel line etc. You should be able to leave all the accessories on the motor while doing the swap if everything on the other motor is in operating condition (IE alternator, power steering pump, water pump, pulleys). Of course you'll run into other small issues during the process but its all part of the learning process. That being said, a shade tree mechanic could probably do the swap in a day and change.

It wouldn't hurt to buy a haynes service manual or something similar.

10-09-2014, 05:27 PM	#2
83swb Registered User Join Date: Sep 2012 Location: CT Posts: 133	Re: 1975 K10 Engine Swap Questions Let me begin by saying that both the 305 and 350 share all the same external characteristics, to make it short the 305 is just a smaller displacement 350. As long long as both motors are Gen1 (First generation chevy small block), which they should be considering both trucks are the same vintage, EVERYTHING should be a straight over swap. When I say straight over I mean that with the engines out of both trucks the "new" motor would bolt in the engine bay exactly the same as the other. You may run into very minor issues in the swap, distributors may be a different style requiring that you modify the power and tachometer connections, exhaust manifolds may be different or one may have headers, you may have to modify your fuel line etc. You should be able to leave all the accessories on the motor while doing the swap if everything on the other motor is in operating condition (IE alternator, power steering pump, water pump, pulleys). Of course you'll run into other small issues during the process but its all part of the learning process. That being said, a shade tree mechanic could probably do the swap in a day and change. It wouldn't hurt to buy a haynes service manual or something similar.