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Old 10-21-2005, 06:08 AM
73 Buick Electra...
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two big (block) questions

my 73 buick electra has a 455 on it and 96k miles...
the guy i bought it from is a good friend of mine and said that the cylinder heads need to be rebuilt...i havent tryed to do anything with the car yet other than getting rid of a bee's nest trying to make a home out of my passenger door...
so heres my first question
he said he can pick up a 307 and tranny out of an early 80's old's station wagon... what would it take for this to fit? how would it be able to mount up?
second... he said the heads need a rebuild...whats my cheepest option there? just sending them to a machine shop? gettin some rebuilt ones online? i really dont know what ima have to do but i want my car running soon...

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Old 10-21-2005, 07:14 AM
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I say get the 455 running. If the 455 just needs the heads rebuilt then do that. Doing engine swaps is a lot of work, a lot of customizing, a lot of time, twice the money you expect, and a lot of problems. Plus the 455 is a very nice engine, much better than a 307 from a 80's car.

The cheapest and best option is to just pull off the heads and take them to a local machine shop. The hard part is to get them back on correctly. I hope you or some one you know can get them back on the engine. This assumes the rest of the engine is in good shape.

Even if the 455 needs a total rebuild, a rebuild is still a better option than installing a 307.
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Old 10-21-2005, 09:11 AM
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A buick 455 is one of the best big blocks ever built. Definitely do not give that up. get your heads gone through at a machine shop and if you can get the casting marks in the chambers and the runners cleaned up.
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Old 10-21-2005, 09:21 AM
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Not sure the buick 455 is considered a big block since the 350 buick is the same external size. However, the 455 internals are big cubes no doubt.

A 455 with an alum. intake is the same weight as a stock 350 sbc. Very cool engine that buick 455. 500 foot pounds of torque!
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Old 10-21-2005, 10:47 PM
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A Buick 350 is smaller externally than a 455, same with Olds. Pontiacs are the ones that are all the same size (except for the orphan 301). Buick 350 & 455 don't even have the same motor mount pad location on the engine.

As far as putting an Olds 307 in a '73 Electra, you might get it to fit if you could find the motor mount setup for a full-sized Oldsmobile of the same vintage with an Olds 350 engine (same external dimensions as the 307). I think '71-'76 GM passenger cars share the same basic frame, so that's where I'd look. Then there's accessories, fan shroud, exhaust, etc. The trans from the wagon will likely be too short. Those '71-'76 GM big cars used an extra-long tail on the transmission, but the 307 will bolt to the Buick T-400.

I don't think I'd go to that much trouble if the 455 just needs the heads done. That's a big old chunk of automobile for a puny 307 to lug around.
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